EPS 2007 Conference - Submitted Abstracts

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Abstract No. Author(s) Title Abstract Suggested Session (click here to order table by session) Comment Contact email
1 Lasukov V.V., Rozhkova S.V. Radioactive decay of Lemaître’s atom The paper studies a quantum theory of the early Universe with a negative cosmological constant. A gravitational analog of the non stationary perturbation theory is developed within which the production of the scalar-field massive quanta by gravitational atoms is studied. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry lav_8@list.ru
2 Lasukov V.V. Dark matter and dark energy of the Universe It is shown that the incorporation of the Logunov coupling equations results in a nonzero Hamiltonian, which allows the problem of time of quantum gravitation theory to be solved outside the framework of traditional approaches. The quantum origin of the Universe due to a positive cosmological constant is studied. The paper advances new theoretical views a fundamental principle of periodicity of superspace and quantum geometrodynamics with a nonzero Hamiltonian. The prediction of an observable value of a cosmological constant is distinguishable from existing knowledge in principle. A possibility of existing spheres filled with a uniform constant scalar field in the Universe is shown. These spheres can act as dark matter and can be responsible for a decreasing behavior of the rotational curved galaxies observed. Astroparticle Physics lav_8@list.ru
3 Kevin Kroeninger, Iris Abt, Allen Caldwell, Manuela Jelen, Daniel Lenz, Jing Liu, Xiang Liu, Bela Majorovits, Jens Schubert The GERmanium Detector Array, GERDA Neutrinoless double beta-decay is a rare, second order weak process which is predicted to occur if the neutrino is a Majorana particle. The observation of this process would reveal the nature of the neutrino. Its half-life would also give information about the absolute neutrino mass scale and the neutrino mass hierarchy. The most stringent limits on the half-life of neutrinoless double beta-decay come from experiments based on the germanium isotope Ge-76. The lower limits derived by the Heidelberg-Moscow and IGEX collaborations are 1.9e25 y and 1.6e25 y, respectively. A claim of discovery was made by parts of the Heidelberg-Moscow collaboration. The sensitivity of these experiments was limited by the amount of background encountered which was dominated by gamma-radiation. The GERmanium Detector Array, GERDA, is a new double beta-decay experiment which is currently under construction in the INFN Gran Sasso National Laboratory, Italy. Its main feature is to operate bare germanium detectors directly in a buffer of high-purity argon which is used as a cooling medium and shield against external gamma-radiation simultaneously. The aim of the experiment is to verify or refute the recent claim of discovery and, in a second phase, to achieve a background level two orders of magnitude below that of recent experiments. For this background level and an expected exposure of 100 kg years GERDA will be sensitive to a half-life of 1.4e26 y, corresponding to an effective Majorana neutrino mass of about 200 meV depending on model calculations. Several techniques to identify background events are implemented in the design of GERDA, such as the usage of segmented germanium detectors and the analysis of the time structure of the detector response. The results of test experiments show the feasibility of these techniques. Accompanying Monte Carlo simulations are in good agreement with the data and can thus reliably predict the background estimate for GERDA. Neutrino Physics kroening@mppmu.mpg.de
4 Mohammad Saleem and Mujahid Kamran, Theory Group, Department of Physics, Punjab University, Lahore. PAKISTAN. Can material particles of zero rest mass exist in nature? The presence or absence of neutrinos of zero rest mass plays a significant role in the development of High Energy Physics. It is shown in this paper that causality precludes material particles, and hence neutrinos, of zero rest mass. This will require a major change in theories of High Energy Physics. Neutrino Physics dmsdmsaleem@yahoo.com
5 A. Bodek, H. Budd, S. Avvakumov, R. Bradford Duality Based Vector and Axial Form Factors- Improved Modeling of Quasielastic Neutrino Cross Sections at all Energies We present a re-analysis of all existing electron and neutrino elastic and quasielastic scattering data on nucleons. By using theoretical constraints from Quark-Hadron duality, we obtain new precise parametrizations of vector and axial nucleon form factors. These new parametrizations are used to improve the predictions for quasielastic neutrino-nucleon cross sections of GeV neutrinos, thus reducing the errors on neutrino oscillations parameters extracted from present and future neutrino oscillations experiments. Neutrino Physics bodek@pas.rochester.edu
6 A. Bodek, U. K. Yang Modeling of Inelastic Neutrino Cross Sections at all Energies We also present updated improvements in the Bodek-Yang model for inelastic neutrino, electron and muon scattering on nucleons, with a combined analysis of all neutrino, muon and electron scattering experiments at all energies. Neutrino Physics bodek@pas.rochester.edu
7 A. K. Monin, A. V. Zayakin Induced Schwinger Process at Non-Zero Temperature Induced process of pair production by an external field is studied at finite temperature. The width of the Thirring meson is calculated within the framework of the Schwinger approach. This quantity appears to be non-perturbative in the external field strength, that is, its field strength dependence exhibits an essential non-analyticity in the weak field limit. The decay rate of the meson at arbitrary temperatures, being expressed exactly in terms of the Matsubara frequencies sum, is given simple approximate estimates for both high- and low-temperature asymptotics. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry zayakin@itep.ru
8 Q. Shafi Realistic Models of Inflation Realistic models of inflation are expected to be closely related to new physics beyond the standard model. We explore such models including some which are closely related to neutrino oscillations . Astroparticle Physics In order to finalize my summer plans it would be very helpful if I could get an early response. shafi@bartol.udel.edu
9 Y H Huseynaliyev, M K Suleymanov, E U Khan, A Kravchakova, S Vokal Search for a signal on intermediate baryon systems formation in hadron-nuclear and nuclear-nuclear interactions at high energies We have analyzed the behavior of different characteristics of hadron-nuclear and nuclear-nuclear interactions as a function of centrality to get a signal on formation of intermediate baryon systems. We observed that these data demonstrate the regime change and saturation. At low energy is existing some structure on the angular distributions of slow particles emitted in these interactions. We have believed that the structure could be connected with formation and decay of the percolation cluster. With increasing the mass of colliding nuclei the structure becomes weakly and almost disappears. This result shows that the number of secondary internuclear interactions increases with increasing the mass of the colliding nuclei. The latter could be a reason of the disintegration of any intermediate formations as well as clusters, which decrease their influence on the angular distribution of the emitted particles. High-Energy Nuclear Physics yashar_huseynaliyev@comsats.edu.pk
10 Asish Satpathy CMS Silicon Tracker - Overview and Status The CMS experiment at the LHC features the largest Silicon Strip Detector ever built. The impact of the operating conditions and physics requirements on the design choices of the CMS Silicon Tracker will be reviewed. The readiness of the Silicon Tracker for the scheduled CMS pilot run in November 2007 will be presented. Detectors and Data Handling I would need about 30 minutes for this talk. asish.satpathy@ucr.edu
11 D.Fargion UHECR and neutrino Showering above and below the Earth The UHECR Ultra High Energy Cosmic Ray may airshower at the horizons with a very peculiar splitting signature due to geomagnetic fields. The same induced Neutrino Astronomy might be born by upward horizontal airshowers due to antineutrino electron Glashow resonance and-or by Tau Neutrino Earth Skimming Air showers. The latter are mostly GZK garanteed and oscillated neutrinos at EeV energy. At different altitude the rate and signature is different. The possibility to use this new filter in astrophysics is already at hand. HESS telescope is tracking HECR compositions. Magic is looking for Horizontal Tau Air Showers. AUGER is looking at the Ande shadows for any Neutrino Showering to be found just beyond the corner. Neutrino Physics "The Horizontal Air-Shower Physics regards UHECR, Neutrino and SUSY physics Beyond the SM" daniele.fargion@roma1.infn.it
12 D.Fargion Surprises by SUSY in the Sky with Showers The SUSY signals might be found in LHC in next few years. However novel signals of SUSY must be found in inderground detectors but also in UHECR either at the horizons or in Upward air-showers. The SUSY lightest candidate, the Neutralino, may compete with Neutrino by air-showering via s-electron resonances. Moreover Gluinos might also play a role. We shall show the SUSY unexpected novel imprint in present and future array detectors, in particular showering in the Sky. Physics Beyond the Standard Model "The UHE SUSY signals are complementary to UHE neutrino Astronomy, but in some way, in wider forms." daniele.fargion@roma1.infn.it
13 BES Collaboration Recent Charmnium and Charm physics results from BES By analyzing the R values measured at 68 energy points in the energy region between 3.650 and 3.872 GeV, we have precisely measured the mass, the total width, the leptonic width and the leptonic decay branching fraction of the psi(3770). We have also measured R(uds) for the continuum light hadron production in the region from 3.650 to 3.872 GeV [hep-ex/0612056]. Based on the data sample of 33 pb(-1) collected at and around 3.773 GeV with the BES-II detector at the BEPC collider, the absolute branching fractions for the semileptonic decays are measured [hep-ex/0610019, hep-ex/0610020]. Using 14 million psi(2S) events accumulated at the BESII detector, a Covariant Helicity Amplitude Analysis is performed for psi(2S) -> pi+pi-J/psi. The pi+pi- mass spectrum, suggests sigma production in this process and the results are consistent with the existence of the sigma. The sigma pole position is determined [hep-ex/0610023]. We report first measurements of branching fractions or upper limits for psi(2S) radiative decays [hep-ex/0612016], and report the measurements for psi(2S) Baryon-antibaryon pairs decays[hep-ex/0610079] Flavour Physics and CP Violation chenjc@mail.ihep.ac.cn
14 BES Collaboration Recent Charm and Charmonium physics results from BES By analyzing the R values measured at 68 energy points in the energy region between 3.650 and 3.872 GeV, we have precisely measured the mass, the total width, the leptonic width and the leptonic decay branching fraction of the psi(3770). We have also measured R(uds) for the continuum light hadron production in the region from 3.650 to 3.872 GeV [hep-ex/0612056]. Based on the data sample of 33 pb(-1) collected at and around 3.773 GeV with the BES-II detector at the BEPC collider, the absolute branching fractions for the semileptonic decays are measured [hep-ex/0610019, hep-ex/0610020]. Using 14 million psi(2S) events accumulated at the BESII detector, a Covariant Helicity Amplitude Analysis is performed for psi(2S) -> pi+pi-J/psi. The pi+pi- mass spectrum, suggests sigma production in this process and the results are consistent with the existence of the sigma. The sigma pole position is determined [hep-ex/0610023]. We report first measurements of branching fractions or upper limits for psi(2S) radiative decays [hep-ex/0612016], and report the measurements for psi(2S) Baryon-antibaryon pairs decays[hep-ex/0610079] Flavour Physics and CP Violation chenjc@mail.ihep.ac.cn
15 BES Collaboration Recent Charm and Charmonium physics results from BES By analyzing the R values measured at 68 energy points in the energy region between 3.650 and 3.872 GeV, we have precisely measured the mass, the total width, the leptonic width and the leptonic decay branching fraction of the psi(3770). We have also measured R(uds) for the continuum light hadron production in the region from 3.650 to 3.872 GeV [hep-ex/0612056]. Based on the data sample of 33 pb(-1) collected at and around 3.773 GeV with the BES-II detector at the BEPC collider, the absolute branching fractions for the semileptonic decays are measured [hep-ex/0610019, hep-ex/0610020]. Using 14 million psi(2S) events accumulated at the BESII detector, a Covariant Helicity Amplitude Analysis is performed for psi(2S) -> pi+pi-J/psi. The pi+pi- mass spectrum, suggests sigma production in this process and the results are consistent with the existence of the sigma. The sigma pole position is determined [hep-ex/0610023]. We report first measurements of branching fractions or upper limits for psi(2S) radiative decays [hep-ex/0612016], and report the measurements for psi(2S) Baryon-antibaryon pairs decays[hep-ex/0610079] Flavour Physics and CP Violation chenjc@mail.ihep.ac.cn
16 Pramod K. Singh, Anil K. Tiwari, Anil K. Shrivastava, Ambika Singh and Laxmi Tripathi SOLAR WIND STREAMS AND THEIR IMPACT ON COSMIC RAY INTENSITY DECREASES Long durations solar wind streams of very high velocity and long duration were observed during the year 2003, the declining phase of solar cycle 23.In this year large number of streams were found to be anomalous.Eleven events of High Speed Solar Wind Streams and associated cosmic ray intensity decreases (Fd)were observed in the year.It was found that during event time period plasma density,plasma temperature as well as interplanetary magnetic field component(B)increases with the solar wind plasma speed.Results will be discussed. Astroparticle Physics, Gravitational Waves and Cosmology nill tiwarianil_trs@rediffmail.com
17 Rimoldi, A; Dell'Acqua, A; Gallas, M.; Di Simone, A; The Simulation suite for the ATLAS Experiment The commissioning phase for the ATLAS experiment, now in preparation of the switching on of the new LHC machine, is a challenge for every development since now performed. The simulation program is in this line, it is operational and running with full functionality within the ATLAS common framework Athena. The latest developments are towards an enhanced versatility, to cope with the increasing needs of developers and users, an easiness in use by a big community such as ATLAS reaching now more than 2000 potential users. Enphasis in this talk is towards the new functionality recently added, validation and production strategy as well as improved robustness and maintainability. Detectors and Data Handling adele.rimoldi@cern.ch
18 Oliver J Rosten Invariant of the Generalized Polchinski Equation The Polchinski equation is a continuum version of Wilson's RG and, as such, describes how the effective action of scalar field theory changes with scale. The lowering of the scale corresponds to integrating out modes. The generalizations of the Polchinski equation that will be discussed correspond to generalizing the way in which high energy modes are integrated over or `blocked'. For a special choice of the blocking functional, it will be shown that it is possible to construct an infinite number of quantities which are invariant under the Exact RG flow. Remarkably, the relationship between these quantities and the Wilsonian effective action vertices can be inverted. From this, it will be shown how power corrections (which are intrinsically nonperturbative) systematically appear in the low energy effective action. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry orosten@stp.dias.ie
19 SuperNEMO Collaboration The neutrinoless double beta decay experiment SuperNEMO SuperNEMO is a next-generation double beta decay experiment based on the successful tracking plus calorimetry technology of the NEMO-3 experiment currently running in the Modane Underground Laboratory. Due to its unique tracking and particle identification capabilities the SuperNEMO experiment might not only be able to discover neutrinoless double beta decay, but also to determine the underlying physics mechanism. Due to the separation of source and detector, SuperNEMO can study a range of isotopes such as 150Nd or 82Se. The total isotope mass will be in the range 100-200 kg. With this isotope mass a sensitivity to neutrino masses of about 50 meV can be reached. Module construction is expected to commence in 2009/2010. The main challenges for the international R&D project are source foil production, radiopurity, calorimeter energy resolution and tracker construction. A first version of the BiPo detector used to measure source foil radiopurity has been installed in the Canfranc Laboratory. The current status of the SuperNEMO project will be presented. Neutrino Physics Also Astroparticle Physics. soldner@fnal.gov
20 V. V. Dvoeglazov Antisymmetric Tensor Fields, 4-Vector Fields, Indefinite Metrics and Normlization On the basis of our recent modifications of the Dirac formalism we generalize the Bargmann-Wigner formalism for higher spins to be compatible with other formalisms for bosons. Relations with dual electrodynamics, with the Ogievetskii-Polubarinov notoph and the Weinberg 2(2J+1) theory are found. Next, we introduce the dual analogues of the Riemann tensor and derive corresponding dynamical equations in the Minkowski space. Relations with the Marques-Spehler chiral gravity theory are discussed. The problem of indefinite metrics, particularly, in quantization of 4-vector fields is clarified. Physics Beyond the Standard Model valeri@planck.reduaz.mx
21 SHIN-SHAN YU CDF SEARCH FOR NEW PHYSICS WITH PHOTONS We present the results of several model-independent searches for new physics in events containing high ET photons. Photons appear in many models such as SUSY, Technicolor, Large Extra Dimensions and compositeness. Using 1-1.5 fb-1 of data collected with the CDF II detector at the Fermilab Tevatron, we search for anomalous production of events with one or two photons with other objects, such as leptons, jets, missing Et. Methods to reject fake photons will also be discussed. Physics Beyond the Standard Model eikoyu@fnal.gov
22 NEMO-3 Collaboration Search for neutrinoless double beta decay with NEMO-3 The NEMO-3 experiment located in the Modane Underground Laboratory (LSM) is searching for neutrinoless double beta decay. The experiment has been taking data since 2003 with a range of isotopes. The main isotopes are ~ 7 kg of 100Mo and ~ 1 kg of 82Se. Since no evidence for neutrinoless double beta decay has been found, a 90% Confidence Level lower limit on the half-life of this process is derived. From this we determine an upper limit on the effective Majorana neutrino mass using nuclear matrix elements. The data are also interpreted in terms of alternative models, such as weak right-handed currents or Majoron emission. In addition, NEMO-3 has performed precision measurements of the double beta decay process with two neutrinos emitted in the final state. Measurements of this process are important for reducing the uncertainties on the nuclear matrix elements. The most recent experimental results will be presented. Neutrino Physics also Astroparticle soldner@fnal.gov
23 B. Basu, S. Dhar and Subir Ghosh Geometric Phases in Noncommutative Phase Space We have studied particle motion in generalized forms of noncommutative phase space, that simulate monopole and other forms of Berry curvature, that can be identified as effective internal magnetic fields, in coordinate and momentum space. The Aharanov-Bohm effect and Aharanov- Casher effect have been considered in this form of phase space, with operatorial structures of noncommutativity. Physical significance of our results are also discussed. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry banasri@isical.ac.in
24 Shulamit Moed Helicity of W Bosons in Top Quark Decays at CDF We present a measurement of the fraction of longitudinally and left-handed polarized W bosons, produced in top quark decays through an analysis of the cosine(theta*) distribution in ttbar candidate events using fully reconstructed lepton plus jets events. This analysis is based on a total integrated luminosity of about 2fb-1 recorded by the CDF detector using ppbar collisions at 1.96 TeV center-of-mass energy. High-Energy Electroweak Physics moed@fnal.gov
25 Double Chooz collaboration Status of the Double Chooz Reactor Experiment The Double Chooz project aims to make a first measurement of the neutrino mixing angle theta13 on a rapid timescale by installing an improved detector system at the site of the successful CHOOZ experiment, in France. Construction of the Phase I far detector begins this winter and should yield a factor of 2-3 improvement on existing bounds before 2010. A second near detector will come online after 2010 which will further strengthen and improve upon this measurement. The design and status of this project will be presented here. Neutrino Physics steven.biller@physics.ox.ac.uk
26 R M Brown, on behalf of the CMS ECAL Group The CMS Lead Tungstate Electromagnetic Calorimeter The CERN Large Hadron Collider will open a new regime in the exploration of fundamental interactions. Of central importance to these studies will be the precise measurement of high energy electrons and photons. The CMS experiment therefore incorporates a high resolution electromagnetic calorimeter comprising 76000 lead tungstate crystals, covering almost 4Pi. This detector must operate reliably for ten years in a very hostile environment. Achieving the required robustness and the design energy resolution of better than 0.5% above 100 GeV has proved a considerable challenge. An overview of the design and the status of construction and commissioning will be reported together with beam measurements, demonstrating that the design performance has been achieved. Detectors and Data Handling R.M.Brown@RL.AC.UK
27 Xiao-Gang He, Jusak Tandean, German Valencia Sigma to p mu+ mu-: Standard Model or Light Pseudoscalar Higgs The HyperCP collaboration observed three events for the decay Sigma^+ -> p mu^+ mu^-. They suggested that new physics may be required to understand the implied decay rate and the observed M_{mumu} distribution. Motivated by this result, we re-examine this mode. First within the standard model, and then assuming there is a new particle. Within the SM we find that Sigma^+ -> p mu^+ mu^- is long-distance dominated and its rate falls within the range suggested by the HyperCP measurement. We then examine the conditions under which the observation is consistent with a light Higgs boson and find an explicit example that satisfies all the constraints: the light pseudoscalar Higgs boson in the next-to-minimal supersymmetric standard model, the A_1^0. Flavour Physics and CP Violation valencia@iastate.edu
28 German Valencia and Yili Wang A CP-odd observable in t t(bar) production at the LHC We study a CP-violating triple product correlation that occurs in the production of t\bar{t} pairs at the LHC. To estimate its possible size we consider a model with CP violation in the Higgs sector. We consider the H -> t \bar{t} decay channel as well as the gluon fusion process gg -> H -> t \bar{t}. The asymmetry in Higgs decay, normalized to the H -> t \bar{t} width, can reach the 6% percent level. In the gluon fusion process the corresponding normalized asymmetry is smaller by an order of magnitude. We present a crude estimate of this observable at the LHC. Physics Beyond the Standard Model Could be High energy electroweak physics also valencia@iastate.edu
29 Jen-Chi Lee Surprises with string scattered from domain-wall at high energies In contrast to the common wisdom, we discover that, instead of the exponential fall-off of the form factors with Regge-pole structure, the high-energy scattering amplitudes of string scattered from Domain-wall behave like power-law with Regge-pole structure. This is to be compared with the well-known power-law fall-off form factors without Regge-pole structure of the D-instanton scatterings. This discovery makes Domain-wall scatterings an unique example of a hybrid of string and field theory scatterings. The calculation is done for bosonic string scatterings of arbitrary massive string states from D-24 brane. Moreover, we discover that the usual linear relations of high-energy string scattering amplitudes at each fixed mass level breaks down for the Domain-wall scatterings. This result gives a strong evidence that the existence of the infinite linear relations, or stringy symmetrie, of high-energy string scattering amplitudes is responsible for the softer, exponential fall-off high-energy string scatterings than the power-law fall-off field theory scatterings. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry "Refs: hep-th/0610062,hep-th/0610219 and hep-th/0612059." jcclee@cc.nctu.edu.tw
30 Cheng-Wei Chiang, Yu-Feng Zhou Flavor SU(3) analysis of charmless B meson decays to two pseudoscalar mesons Global fits to charmless B --> PP decays in the framework of flavor SU(3) symmetry are updated and improved without reference to the \sin2\beta measured from the charmonium decay modes. Fit results directly constrain the (\bar\rho,\bar\eta) vertex of the unitarity triangle, and are used to predict the branching ratios and CP asymmetries of all decay modes, including those of the B_s system. Different schemes of SU(3) breaking in decay amplitude sizes are analyzed. The major breaking effect between strangeness-conserving and strangeness-changing decays can be accounted for by including a ratio of decay constants in tree and color-suppressed amplitudes. The possibility of having a new physics contribution to K \pi decays is also examined from the data fitting point of view. Flavour Physics and CP Violation zhou@post.kek.jp
31 Cheng-Wei Chiang, Yu-Feng Zhou Flavor SU(3) analysis of charmless B meson decays to two pseudoscalar mesons Global fits to charmless B --> PP decays in the framework of flavor SU(3) symmetry are updated and improved without reference to the \sin2\beta measured from the charmonium decay modes. Fit results directly constrain the (\bar\rho,\bar\eta) vertex of the unitarity triangle, and are used to predict the branching ratios and CP asymmetries of all decay modes, including those of the B_s system. Different schemes of SU(3) breaking in decay amplitude sizes are analyzed. The major breaking effect between strangeness-conserving and strangeness-changing decays can be accounted for by including a ratio of decay constants in tree and color-suppressed amplitudes. The possibility of having a new physics contribution to K \pi decays is also examined from the data fitting point of view. Flavour Physics and CP Violation Journal-ref: JHEP 0612 (2006) 027 zhou@post.kek.jp
32 Cheng-Wei Chiang, Yu-Feng Zhou Flavor SU(3) analysis of charmless B meson decays to two pseudoscalar mesons Global fits to charmless B --> PP decays in the framework of flavor SU(3) symmetry are updated and improved without reference to the \sin2\beta measured from the charmonium decay modes. Fit results directly constrain the (\bar\rho,\bar\eta) vertex of the unitarity triangle, and are used to predict the branching ratios and CP asymmetries of all decay modes, including those of the B_s system. Different schemes of SU(3) breaking in decay amplitude sizes are analyzed. The major breaking effect between strangeness-conserving and strangeness-changing decays can be accounted for by including a ratio of decay constants in tree and color-suppressed amplitudes. The possibility of having a new physics contribution to K \pi decays is also examined from the data fitting point of view. Flavour Physics and CP Violation hep-ph/0609128. Journal-ref: JHEP 0612 (2006) 027 zhou@post.kek.jp
33 Sebastian de Haro Bubbles of True Vacuum in M-Theory I will review recent progress in the holographic description of tunneling processes in M-theory, in particular the issue of bubble formation, which is crucial in various areas of cosmology such as inflationary scenarios. The talk is based on the series of papers hep-th/0606276, hep-th/0611315, hep-th/0701144. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry sebastian.deharo@kcl.ac.uk
34 N.Armesto, L.Cunqueiro,C.Salgado and W.Xiang Medium Modified Fragmentation Functions We extend the Sudakov formalism from vacuum to opaque media by modifying the splitting functions with the medium-induced gluon radiation spectrum. We then solve DGLAP evolution equations in order to obtain the medium modified fragmentation functions. The medium increses the branching probability and thus accelerates the evolution. We will present some examples at relevant LHC scales. In this way, some of the limitations of previous attempts of MMFF based on the use of the quenching weights are now superseeded. As a phenomenological application, we compute the suppression of the high pt yields in heavy-ion collisions by convoluting the obtained fragmentation functions with the perturbative spectrum. This allows us to obtain the value of the time averaged transport coefficient-- the quantity encoding the medium properties -- which will be comparedwith that obtained in other approaches neglecting the mediummodification of QCD evolution. High-Energy Nuclear Physics leticia@fpaxp1.usc.es
35 Bezrukov Fedor nuMSM and its experimental tests The nuMSM is the simple extenson of the Standard Model by three massive singlet neutrinos. It provides explanation for the neutrino masses, Dark Matter and baryon asymmetry of the Universe, providing also prediction for the scale of the active neutrino masses. In this talk we are going to discuss the possible outcome of the theory for particle physics experiments. Physics Beyond the Standard Model Neutrino physics session may be also ok. Fedor.Bezrukov@epfl.ch
36 Maxim Dvornikov New approach to the description of neutrino oscillations in various external fields We examine neutrino flavor and spin-flavor oscillations in frames of the classical field theory approach. Neutrinos wave functions are considered to be first quantized fields. Neutrino oscillations in vacuum, in matter and in an external electromagnetic field are studied. On the basis of the exact solutions of the Dirac equation in various external fields we obtain the corresponding transition and survival probabilities. The obtained probabilities expressions are compared with the results of other methods for the description of neutrino oscillations. We also discuss the corrections to the leading terms in the probabilities expressions. Neutrino Physics "The talk is based on the following works: 1) M. Dvornikov, Phys.Lett.B 610 (2005) 262; hep-ph/0411101. 2) M. Dvornikov, Eur.Phys.J.C 47 (2006) 437; hep-ph/0601156. 3) M. Dvornikov, J. Maalampi, hep-ph/0701209." dvmaxim@cc.jyu.fi
37 BHAVIN PATEL, AJAY KUMAR RAI , P.C.VINODKUMAR Masses and magnetic moments of heavy flavour baryons in Hyper central model Recently, there is a renewed interest in the magnetic moments and spectroscopy of heavy flavour baryons both experimentally and theoretically [1-9]. The description of baryons within the constituent quark models is an important task in hadron physics. Since the baryon is a three-body system, it is complicated compared to the two body meson system. Many of the constituent quark models have provided the masses of baryons and their magnetic moments correctly at the light flavour sector. However many of these models do not provide the form factors correctly that reproduces experimental data [1] and for this reason alternate schemes to describe the properties of baryons particularly in the heavy flavour sector are being attempted [1, 2]. Here, we employ the hyper central approach to study the three-body problem [1, 2], particularly the baryons constituting one or more charm and or beauty quarks. The confinement potential is assumed in the hyper central co-ordinates of the coulomb plus power potential form. It should be mentioned that, hyper central potential contains the effects of the three body force as it is suggested by lattice QCD calculations [8]. For the low-lying resonance states it is good approximation to simply take the space wave functions of the hyper Coulomb potential instead of the ones coming from the numerical solution of the linear plus Coulomb potentials with hyperfine interaction. Our computed results on the masses and magnetic moments of the charmed and beauty baryons computed under this scheme for different power indices starting from 0.5 to 2.0 will be presented [9]. References [1] M. M. Giannini et. al, Eur. Phys. J.A 12, 447-452 (2001). [2] E. Santopinto et. al , Eur. Phys. J.A 1, 307- 315 (1998). [3] P. Avery et. al., CLEO collab. Phys. Rev. Lett. 75, 4364 (1995). [4] D. Ebert et. al, Phys. Rev. D 72, 034026 (2005). [5] W. M. Yao et. al, (PDG) Jour. Phys. G 33,1(2006). [6] S. B. Athar et. al, [CLEO Collaboration], Phys. Rev. D 71 ,051101(2005). [7] Eduarev Dela Cruz Burelo (CDF & Collaboration) Nucl. Phys. B (Proce. Suppl.) 156,244(2006). [8] Gunnar S.Bali, Phys. Rep. 343 (2001) 1. [9] Bhavin Patel et. al ‘Charmed and Beauty Baryon in hyper Central Model’ Proc. DAE-BRNS Symp. on Nucl. Phys. Vol. 51(2006)509-510. Strong Interactions azadpatel2003@yahoo.co.in
38 Mario Martinez (IFAE-Barcelona, CDF Collaboration) Inclusive Search for Squark/Gluino Production at CDF We present preliminary results on search for squarks and gluinos in proton-antiproton collisions at sqrt{s} = 1.96 TeV at Tevatron, based on 1 fb-1 of data collected by the CDF experiment in Run II. The search is performed on events with multiple jets and large missing transverse energy in the final state, within the framework of the Minimal Supersimmetric Standard Model and assuming that the R-parity is conserved. The measurement is compared to the Standard Model predictions and limits on the gluino and squark masses are extracted. Physics Beyond the Standard Model On behalf of the CDF Collaboration mmp@fnal.gov
39 Mario Martinez (IFAE-Barcelona, CDF Collaboration) Measurement of the Inclusive Z+jet(s) Production Cross Section at CDF We present preliminary results on inclusive Z-boson plus jets production in pp-bar collisions at sqrt{s} = 1.96 TeV. The measurements are based on 1 fb-1 of data collected by the CDF experiment in Run II. The analysis is performed in the context of studies on irreducible backgrounds in searches for new physics in final states with jets and missing transverse energy. The measured cross sections are compared to NLO pQCD predictions. Strong Interactions on behalf of the CDF Collaboration mmp@fnal.gov
40 M. Martinez (IFAE-Barcelona, CDF Collaboration) Measurement of the Inclusive Jet Cross Section using the k_T algorithm in pp-bar Collisions at sqrt{s} = 1.96 TeV with the CDF II Detector We report on measurements of the inclusive jet production cross section as a function of the jet transverse momentum in pp-bar collisions at sqrt{s} = 1.96 TeV, using the k_T algorithm and a data sample corresponding to 1.0 fb^-1 collected with the Collider Detector at Fermilab in Run II. The measurements are carried out in five different jet rapidity regions with |yjet| < 2.1 and transverse momentum in the range 54 < ptjet < 700 GeV/c. Next-to-leading order perturbative QCD predictions are in good agreement with the measured cross sections. Strong Interactions on behalf of the CDF Collaboration mmp@fnal.gov
41 Arnaud Belletoile for the Codalema colaboration radiodetection of UHECR with Codalema The CODALEMA experiments has been succesfully reinvestigating the radiodetection method of UHECR for few years. Since September 2006, it is under operation with a new setup at the Nancay Radio Observatory, France. It uses 16 broadband dipole antennas associated with 13 particle detectors generating the trigger and allowing the primary cosmic ray energy estimation. We will present the evidence for the radio detection of cosmic ray above 10^17 eV, based on an event by event analysis showing time and arrival direction coincidences between the two detectors arrays. The characteristics of the showers detected, like core position and lateral electric field dependence, will be presented. Finally, the correlation between the cosmic ray energy determined by the particle detectors and the electric field amplitude measured by the dipoles will be discussed. Astroparticle Physics, Gravitational Waves and Cosmology arnaud.belletoile@subatech.in2p3.fr
42 A.B.Kaidalov, M.I.Vysotsky To the origin of the difference of FSI phases in $B\to\pi\pi$ and $B\to\rho\rho$ decays. The final state interactions (FSI) model in which soft rescattering of low mass intermediate states dominates is suggested. It explains why the strong interaction phases are large in the $B_d\to\pi\pi$ channel and are considerably smaller in the $B_d\to\rho\rho$ one. Direct CP asymmetries of $B_d\to\pi\pi$ decays which are determined by FSI phases are considered as well. Flavour Physics and CP Violation vysotsky@itep.ru
43 Karel Kolar On factorization scheme suitable for MC event generators At the present time, many hard scattering processes at the parton level are calculated at the next-to-leading order (NLO) accuracy and the corresponding NLO cross-sections are being incorporated in current Monte-Carlo event generators. However, the construction of consistent NLO event generators requires, beside NLO matrix elements for the parton level hard processes and NLO parton distribution functions (PDF), also the generation of NLO parton showers, which simulate the scale dependence of PDF. However, the generation of NLO parton showers is much more complicated than the generation of LO ones, and that is probably why the developed algorithm for the generation of NLO parton showers has so far not gained wider use. The complications in generating NLO parton showers are caused by some properties that the NLO splitting functions have in the "standard" MS bar factorization scheme. Therefore, the complications could be avoided by the choice of a convenient factorization scheme. The most convenient factorization scheme for that is the one in which all NLO splitting functions are equal to zero, because NLO parton showers are then formally identical to LO ones. Working in this factorization scheme, we thus obtain results at the NLO accuracy without changing the procedure for generating parton showers. We must only transform parton level cross-sections and PDF from the "standard" MS bar factorization scheme to the one which we call "zero". Two important points for the construction of consistent NLO event generators in this way will be presented: the transformation of parton level cross-sections and PDF between factorization schemes and obtaining necessary parameters for the determination of the "zero" factorization scheme. Strong Interactions I would like to give a talk on the subject specified in the above Abstract kolark@fzu.cz
44 Daniel de Florian, Rodolfo Sassot, Marco Stratmann Global analysis of fragmentation functions for pions and kaons and their uncertainties We present new sets of pion and kaon fragmentation functions obtained in NLO combined analyses of single-inclusive hadron production in electron-positron annihilation, proton-proton collisions, and deep-inelastic lepton-proton scattering with either pions or kaons identified in the final state. At variance with all previous fits, the present analyses take into account data where hadrons of different electrical charge are identified, which allow to discriminate quark from anti-quark fragmentation functions without the need of non trivial flavor symmetry assumptions. The resulting sets are in good agreement with all data analyzed, which cover a much wider kinematical range than in previous fits. An extensive use of the Lagrange multiplier technique is made in order to assess the uncertainties in the extraction of the fragmentation functions and the synergy from the complementary data sets in our global analysis. Strong Interactions hep-ph/0703242 sassot@df.uba.ar
45 ZEUS Collaboration Measurement of prompt photons with associated jets in photoproduction at HERA The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb-1. Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential gamma+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x(gamma)^obs, the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading- order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the kT-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the kT-factorisation calculations are in good agreement with the data. Strong Interactions halina@mail.desy.de
46 ZEUS Collaboration Inclusive-jet and dijet cross sections in deep inelastic scattering at HERA Inclusive-jet and dijet differential cross sections have been measured in neutral current deep inelastic ep scattering for exchanged boson virtualities Q2 > 125 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 82 pb-1. Jets were identified in the Breit frame using the kT cluster algorithm. The cross sections are presented as functions of several kinematic and jet variables. The results are also presented in different regions of Q2. Next-to-leading-order QCD calculations describe the measurements well. Regions of phase space where the theoretical uncertainties are small have been identified. Measurements in these regions have the potential to constrain the gluon density in the proton when used as inputs to global fits of the proton parton distribution functions. Strong Interactions halina@mail.desy.de
47 ZEUS Collaboration Measurement of azimuthal asymmetries in neutral current deep inelastic scattering at HERA The distribution of the azimuthal angle of charged and neutral hadrons relative to the lepton plane has been studied for neutral current deep inelastic ep scattering using an integrated luminosity of 45 pb-1 taken with the ZEUS detector at HERA. The measurements were made in the hadronic centre-of-mass system. The analysis exploits the energy-flow method, which allows the measurement to be made over a larger range of pseudorapidity compared to previous results. The dependence of the moments of the azimuthal distributions on the pseudorapidity and minimum transverse energy of the final-state hadrons are presented. Although the predictions from next-to-leading-order QCD describe the data better than do the Monte Carlo models incorporating leading-logarithm parton showers, they still fail to describe the magnitude of the asymmetries. This suggests that higher-order calculations may be necessary to describe these data. Strong Interactions halina@mail.desy.de
48 ZEUS Collaboration Photoproduction of Events with Rapidity Gaps between Jets at HERA The photoproduction of dijet events, where the two jets with the highest transverse energy are separated by a large gap in pseudorapidity, have been studied with the ZEUS detector using an integrated luminosity of 39 pb-1 . Rapidity- gap events are defined in terms of the energy flow between the jets, such that the total summed transverse energy in this region is less than some value E_T^{CUT}. The data show a clear excess over the predictions of standard photoproduction models. This is interpreted as evidence for a strongly interacting exchange of a color-singlet object. Monte Carlo models which include such a color-singlet exchange are able to describe the data. Strong Interactions halina@mail.desy.de
49 ZEUS Collaboration Measurement of K^0_s, Lambda, Antilambda Production at HERA The production of the neutral strange hadrons K0_S, Lambda and anti-Lambda has been measured in ep collisions at HERA using the ZEUS detector. Cross sections, baryon-to-meson ratios, relative yields of strange and charged light hadrons, Lambda-antiLambda asymmetry and polarization have been measured in three kinematic regions: Q2 > 25 GeV2, 5 < Q2 < 25 GeV2 and in photoproduction (Q2 ~ 0), in which the presence of two hadronic jets, each with at least 5 GeV transverse energy, was required. The measurements agree in general with Monte Carlo models and are consistent with measurements made at e+e- colliders, except for an enhancement of baryon relative to meson production in photoproduction. Strong Interactions halina@mail.desy.de
50 ZEUS Collaboration Jet-radius dependence of inclusive-jet cross sections in deep inelastic scattering at HERA Differential inclusive-jet cross sections have been measured for different jet radii in neutral current deep inelastic ep scattering for boson virtualities Q2 >125 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 81.7 pb-1. Jets were identified in the Breit frame using the kT cluster algorithm in the longitudinally inclusive mode for different values of the jet radius R. Differential cross sections are presented as functions of Q2 and the jet transverse energy, ETjet,B. The dependence on R of the inclusive-jet cross section has been measured for Q2 > 125 and 500 GeV2 and found to be linear with R in the range studied. Next-to-leading-order QCD calculations give a good description of the measurements for 0.5 <= R <= 1. A value of alphas(Mz) has been extracted from the measurements of the inclusive-jet cross-section dsigma/dQ2 with R=1 for Q2 > 500 GeV2: alphas(Mz)=0.1207+-0.0014 (stat.) (-0.0033,+0.0035) (exp.) (-0.0023,+0.0022) (th.). The variation of alphas with ETjet,B is in good agreement with the running of alphas as predicted by QCD. Strong Interactions halina@mail.desy.de
51 ZEUS Collaboration Study of energy dependence of the mean charged multiplicity at HERA The hadronic final state has been investigated in inclusive neutral current deep inelastic ep scattering with the ZEUS detector at HERA, using an integrated luminosity of 38.6 pb-1. The mean charged multiplicity and multiplicity distributions have been studied for the hadrons belonging to the current region of the Breit frame, as well as for those belonging to the photon fragmentation region of the hadronic centre-of-mass (HCM) frame. The results are compared to leading-logarithm parton-shower Monte Carlo predictions as well as to results of e+e-, pp and previous DIS measurements. Strong Interactions halina@mail.desy.de
52 ZEUS Collaboration Measurements of (anti)deauteron and (anti)proton production in DIS at HERA A first observation of (anti)deuterons in deep inelastic ep scattering (DIS) with the ZEUS detector at HERA is reported. The data sample consists of DIS events at a centre-of-mass energy of 300-318 GeV, and corresponds to 120 pb-1 integrated luminosity. The measurements are performed in the central rapidity region for the transverse-momentum per nucleon mass between 0.3 and 0.7. The particle rates were extracted and interpreted in terms of the coalescence model. The (anti)deuteron production rate is approximately three orders of magnitude suppressed relative to the (anti)proton yield, which is consistent with the world measurements. Strong Interactions halina@mail.desy.de
53 ZEUS Collaboration A first observation of (anti)deuterons in deep inelastic ep scattering Three- and four-jet final states have been measured in photoproduction at HERA using the ZEUS detector and an integrated luminosity of 121 pb-1. The three-jet results are presented in a wider phase-space and are based on over seven times the luminosity of the previous HERA publication. The four-jet photoproduction cross section has been measured for the first time and represents the highest order process studied at HERA. The events have been studied in a low-, 25 < Mnj < 50 GeV, and a high-mass region, Mnj > 50 GeV, where Mnj is the invariant mass of the n-jet system. The three-jet cross sections have been compared to an order alpha_s squared perturbative QCD calculation. In addition, both the three- and four-jet cross sections have been compared with leading-logarithmic parton-shower Monte Carlo models, with and without multi-parton interactions. Strong Interactions halina@mail.desy.de
54 ZEUS Collaboration Forward-jet production in deep inelastic ep scattering at HERA Inclusive forward jet and dijet accompanied by a forward jet cross sections in neutral current deep inelastic scattering at low Bjorken-x have been measured with the ZEUS detector at HERA using an integrated luminosity of 82 pb-1. The explored phase-space with jet pseudorapidity up to 4.3 is expected to be particularly sensitive to the dynamics of QCD parton evolution. The measurements are compared with fixed order QCD calculations and with leading-logarithm parton-shower Monte Carlo models. Strong Interactions halina@mail.desy.de
55 ZEUS Collaboration Bose-Einstein correlations of charges and neutral kaons in deep inelastic scattering at HERA Bose-Einstein correlations of charged and neutral kaons have been measured in deep inelastic scattering at HERA using an integrated luminosity of 121 pb-1 of ep collisions. The two-particle correlation function was studied as a function of the four momentum difference of the kaon-pairs, Q12=sqrt(-(p1-p2)2), assuming a Gaussian shape of the particle source. The radius of the production volume, r, and the coherence strength factor, lambda, were obtained for both neutral and charged kaons.56 Strong Interactions halina@mail.desy.de
56 ZEUS Collaboration Subjet distributions in inclusive-jet production in deep inelastic scattering at HERA Subjet distributions have been measured in neutral current deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 81.7 pb-1 . Jets were identified using the kT cluster algorithm in the longitudinally invariant inclusive mode in the laboratory frame. Subjets, or jet-like substructures within jets, were then defined as the number of clusters resolved in a jet by reapplying the jet algorithm at a smaller resolution scale y_cut. Measurements of subjet distributions are presented as functions of the ratio between the subjet transverse energy and that of the jet, the difference between the subjet pseudorapidity (azimuth) and that of the jet, and alpha^sbj, the angle, as viewed from the jet centre, between the highest transverse energy subjet and the beam line in the pseudorapidity-azimuth plane. The measured normalised cross sections were used to study the pattern of parton radiation by comparing them with leading-logarithm parton-shower Monte Carlo models and perturbative QCD calculations. Strong Interactions halina@mail.desy.de
57 ZEUS Collaboration Angular correlations in three-jet production in ep collisions at HERA Three-jet production in the deep inelastic ep scattering and photoproduction regimes has been investigated with the ZEUS detector at HERA using an integrated luminosity of 127 pb-1. Jets were identified using the k_T cluster algorithm in the longitudinally invariant inclusive mode. Measurements of differential cross sections are presented as functions of jet angular correlations between the three jets in the final state and the proton-beam direction. These correlations were investigated to separate the contributions from different color configurations; in particular, angular correlations sensitive to the presence of a triple-gluon vertex were analysed. Fixed-order perturbative QCD calculations assuming the values of the colour factors C_F, C_A and T_F as derived from a variety of gauge groups were compared to the measurements to study the underlying gauge group symmetry. Strong Interactions halina@mail.desy.de
58 ZEUS Collaboration Multijet production at low x_bj in deep inelastic scattering at HERA Inclusive dijet and trijet production in deep inelastic ep scattering has been measured for 10 Strong Interactions halina@mail.desy.de
59 ZEUS Collaboration duplicate of previous Strong Interactions
60 ZEUS Collaboration High-E_T dijet photoproduction at HERA The cross section for high-E_T dijet production in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 82 pb-1. The events were required to have a virtuality of the incoming photon, Q2, of less than 1 GeV2 and a photon-proton centre-of-mass energy in the range 142 < W_{\gamma p} < 293 GeV. Events were selected if at least two jets satisfied the transverse-energy requirements of E_T^{jet1} > 20 GeV and E_T^{jet2} > 15 GeV and pseudorapidity requirements of -1 < eta^{jet1,2} < 3, with at least one of the jets satisfying -1 < eta^{jet} < 2.5. These data can be used to further constrain the parton densities in the proton. The measurements are compared to next-to-leading-order QCD predictions and show sensitivity to the choice of the parton densities in the photon and to the effects of higher orders. Strong Interactions halina@mail.desy.de
61 ZEUS Collaboration Scaled momentum spectra in the current region of the Breit frame at HERA Charged particle production has been studied in deep inelastic scattering (DIS) using an integrated luminosity of about 0.5 fb-1 taken with the ZEUS detector at HERA. The evolution of scaled momentum distributions as a function of Q2 has been investigated in the current fragmentation region of the Breit frame. The fragmentation properties of the struck quark in DIS are compared to next-to-leading order calculations with the fragmentation functions obtained from e+e- experiments. Scaling violations are observed. The scaled momentum spectra are compared to modified leading-logarithmic QCD approximation and to Monte Carlo event generators. In addition, the limiting spectrum was investigated and compared to the results from e+e- experiments. Strong Interactions halina@mail.desy.de
62 ZEUS Collaboration Dijet photoproduction in association with a leading neutron at HERA The cross section for dijet photoproduction in association with a leading neutron, e+ p -> e+ n j j X, has been measured with the ZEUS detector, using an integrated luminosity of 45.4 pb-1. Leading neutron energy and momentum spectra were measured for neutron energy E_n > 180 GeV, and neutron production angle theta_n < 0.75 mrad. The fraction of dijet events with a leading neutron in the final state was studied as a function of the jet kinematic variables. Predictions from a one-pion-exchange model are compared to the data. Strong Interactions halina@mail.desy.de
63 ZEUS Collaboration Inclusive diffraction with a large rapidity gap The ZEUS detector has been used to study the dissociation of virtual photons, gamma* p -> X p, in ep collisions at HERA in events with a large rapidity gap (LRG) between X and the outgoing proton, as well as in events with a measured leading proton. The data cover photon virtualities Q2 > 2 GeV2 and masses of the hadronic final state MX > 2 GeV. LRG events were required to have xIP < 0.02, where xIP indicates the fractional momentum loss of the scattered proton. Events with a leading proton, detected in the ZEUS leading proton spectrometer, were required to have the proton carrying at least 90% of the incoming proton energy. The data are presented in terms of the diffractive structure function F2D. Strong Interactions halina@mail.desy.de
64 ZEUS Collaboration Inclusive diffraction in deep inelastic scattering with the MX method at Deep inelastic scattering and its diffractive component, e p -> e X p, have been studied with the ZEUS detector, covering a wide range in the photon virtuality (20 < Q2 < 450 GeV2), in the mass of the hadronic final state X (0.28 < MX < 35 GeV) and in the gamma* p center of mass energy (37 < W < 245 GeV). The MX distribution of the diffractive component is statistically extracted from the inclusive MX distribution, utilizing the difference in the shape of the MX distribution of diffractive and nondiffractive events. The data are presented in terms of the diffractive cross section, dsigma/dMX, and of the diffractive structure function, F2D. The ratio of the diffractive to the total cross section is also measured. Strong Interactions halina@mail.desy.de
65 ZEUS Collaboration Diffractive dijets in photoproduction at HERA The ZEUS detector has been used to study the process e p -> e p j j X, in which the final state contains at least two jets separated from the final state proton by a large rapidity gap. The data cover photon virtualities Q^2 < 1 GeV^2. The two jets with highest transverse energy were required to have E_Tjet1(2) >7.5(6.5) GeV, measured in the laboratory frame. Differential cross sections are compared to next-to-leading-order QCD predictions using different parametrizations of the diffractive parton densities. Strong Interactions halina@mail.desy.de
66 ZEUS Collaboration Diffractive dijets in deep inelastic scattering at HERA The ZEUS detector has been used to study the process e p -> e p j j X, in which the final state contains at least two jets separated from the final state proton by a large rapidity gap. The data cover photon virtualities 5 < Q2 < 100 GeV2. The two jets with highest transverse energy were required to have E_Tjet1(2) >5(4) GeV, measured in the gamma*p rest frame. Differential cross sections are compared to next-to-leading-order QCD predictions using different parametrizations of the diffractive parton densities. Strong Interactions halina@mail.desy.de
67 ZEUS Collaboration Photoproduction of J/Psi with large-t at HERA The proton-dissociative diffractive photoproduction of J/Psi mesons has been studied in ep collisions with the ZEUS detector at HERA using an integrated luminosity of 112 inverse pb. The cross section has been measured as a function of the centre-of-mass energy of the photon-proton system and of the squared four-momentum transfer at the proton vertex. The results are compared to perturbative QCD calculations based on BFKL and DGLAP dynamics. Strong Interactions halina@mail.desy.de
68 ZEUS Collaboration Deeply Virtual Compton Scattering (DVCS) at HERA We present results on the deeply virtual Compton scattering process gamma* p --> gamma p in ep collisions at sqrt{s} = 318 GeV. The measurement is based on data taken from the HERA-I running period, where the ZEUS Leading Proton Spectrometer (LPS) has been used to measure the momentum of the scattered proton. The cross sections are measured as a function of the photon virtuality, Q2, the invariant mass of the gamma p system, W, and differentially in t, the squared four-momentum transfered at the proton vertex. Strong Interactions halina@mail.desy.de
69 ZEUS Collaboration Exclusive dipion electroproduction at HERA Measurements of exclusive dipion production using an integrated luminosity of 195 pb-1, collected with the ZEUS detector at HERA during 2004-2006, are presented. Events with photon virtuality satisfying Q2 > 5 GeV2, and the photon-proton centre-of-mass energy 40 < W < 120 GeV were used in the analysis, with the invariant mass of the dipion system from 1.2 GeV to 5 GeV. The differential cross sections as functions of the kinematic variables W, Q2, |t| (the four momentum transfer squared between the dipion system and the virtual photon) and the angular distributions of the dipion system are presented. Strong Interactions halina@mail.desy.de
70 ZEUS Collaboration Exclusive rho0 electroproduction at HERA Exclusive rho0 electroproduction at HERA has been studied with the ZEUS detector, using 120 pb-1 integrated luminosity collected during 1996-2000. The analysis was carried out in the kinematic range of photon virtuality of 2 < Q2 < 160 GeV2, and gamma* p center-of-mass energy of 32 < W < 180 GeV. The results include the Q2 and W dependence of the gamma* p --> rho0 p cross section and the distribution of the squared-four-momentum transfer to the proton. The helicity analysis of the decay-matrix elements of the rho was used to extract the ratio of longitudinal to transverse gamma* p cross section as a function of Q2 and W. Finally, the Pomeron trajectory was extracted. The results were compared to various theoretical predictions. Strong Interactions halina@mail.desy.de
71 ZEUS Collaboration Photoproduction of Upsilon at HERA The photoproduction reaction gamma p --> mu+mu- p has been studied in ep interaction using the ZEUS detector at HERA. The Upsilon vector meson has been observed in a data sample corresponding to an integrated luminosity of 250 pb-1. The gamma p cross section for Upsilon production is presented as a function of W in the range 60 < W < 220 GeV. Strong Interactions halina@mail.desy.de
72 ZEUS Collaboration Exclusive dijet production in diffractive deep inelastic scattering The data collected in 1998-2000 by the ZEUS detector at the HERA ep collider have been used to search for exclusive dijet production in diffractive deep inelastic scattering. The events were selected by requiring the presence of a large rapidity gap between the direction of the scattered proton, not observed in the detector, and the remaining hadronic final state. The jets were reconstructed in the center of mass system of the diffractive hadronic state with the k_T-algorithm in the exclusive mode. The properties of events with only two jets present in the final state were studied in the region of photon virtuality Q2>20 GeV2, center of mass energy of the photon-proton system 1600.5. Strong Interactions halina@mail.desy.de
73 ZEUS Collaboration Measurement of Prompt Photons with Associated Jets in Photoproduction at HERA The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb-1. Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential gamma+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x(gamma)^obs, the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading- order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the kT-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the kT-factorisation calculations are in good agreement with the data. Strong Interactions halina@mail.desy.de
74 ZEUS Collaboration Multi-jet cross sections in charged current deep inelastic scattering with HERA II Differential jet cross sections have been measured in charged current deep inelastic ep scattering at high boson virtualities Q^2 with the ZEUS detector at HERAII using an integrated luminosity of ~200 pb-1. Jets were identified using the k_T cluster algorithm in the longitudinally invariant inclusive mode. Cross sections are presented for inclusive-jet production as functions of Q^2, x_Bj and the jet transverse energy and pseudorapidity. The dijet invariant mass cross section is also presented. Observation of three jet events in charged-current processes is reported for the first time. Leading-logarithm parton-shower Monte Carlo model and next-to-leading-order QCD calculations are compared to the measurements. Strong Interactions halina@mail.desy.de
75 ZEUS Collaboration Dijets cross sections in DIS with HERA II Dijet differential cross sections have been measured in neutral current deep inelastic ep scattering for exchanged boson virtualities 125 < Q2 < 5000 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 209 pb-1. Jets were identified in the Breit frame using the k_T cluster algorithm. Jet cross sections are presented as functions of several kinematic and jet variables. The results are also presented in different regions of Q2. Next-to-leading-order QCD calculations describe the measurements well. Strong Interactions halina@mail.desy.de
76 ZEUS Collaboration Inclusive-jet production in neutral-current deep inelastic ep scattering at high Q**2 with HERA II Inclusive-jet production in neutral-current deep inelastic ep scattering at high Q**2 has been investigated with the ZEUS detector using all the available luminosity from the HERA II running period. Jets were identified in the Breit frame using the k_T cluster algorithm in the longitudinally invariant inclusive mode. Measurements of differential cross sections are presented as functions of Q**2 and the jet transverse energy, E^jet_T,B. Regions of phase space have been identified where the theoretical uncertainties are small. Measurements in these regions have the potential to constrain the gluon density in the proton. Next-to-leading order QCD calculations are compared to the results and used to make a determination of the strong coupling constant, alpha_s(M_Z). Furthermore, the energy-scale dependence of alpha_s has been determined from the measured differential cross section as a function of E^jet_T,B and compared to the running of alpha_s as predicted by QCD. Strong Interactions halina@mail.desy.de
77 ZEUS Collaboration Jet substructure in neutral-current deep inelastic ep scattering at high Q**2 with HERA II Jet substructure for jets produced in the deep inelastic ep scattering regime has been studied for exchanged boson virtualities Q2>125 GeV**2 with the ZEUS detector at HERA using all the available luminosity from the HERA II running period. Jets were identified in the laboratory frame using the kT cluster algorithm in the longitudinally inclusive mode. The substructure of jets has been investigated in terms of the jet shape and subjet multiplicity in different regions of the jet transverse energy and pseudorapidity. Next-to-leading-order QCD calculations are compared to the measurements. A value of alpha_s(M_Z) is extracted from the measurements. Strong Interactions halina@mail.desy.de
78 ZEUS Collaboration Measurement of the neutral-current deep-inelastic scattering cross The ZEUS experiment at the ep collider HERA has performed a new measurement of the deep-inelastic scattering cross-sections with the data collected during the years 2006 and 2007. The measurement is optimized for the kinematic region of large values of the inelasticity y where several experimental challenges need to be overcome. The results were compared to the expectations of the Standard Model obtained with several parton density functions. Strong Interactions halina@mail.desy.de
79 ZEUS Collaboration W Production and the Search for Events with an Isolated High-Energy Lepton and Missing Transverse Momentum at HERA A search for events with isolated high transverse energy leptons and large missing transverse momentum has been performed with the ZEUS detector at HERA using data samples taken during the 1996-2007 running period. The results are compared to the Standard Model predictions. The cross section for single production of W bosons at HERA is estimated. Physics Beyond the Standard Model halina@mail.desy.de
80 ZEUS Collaboration Measurement of high-Q2 neutral current deep inelastic e- p scattering cross sections with longitudinally polarised electrons at ZEUS Measurements of the neutral current cross sections for deep inelastic scattering in e-p collisions at HERA with longitudinally polarised electron beams are presented. Single differential cross sections in Q2, x and y, and double differential cross sections in Q2 and x are shown in the kinematic region of Q2 > 185 GeV2 separately for positively and negatively polarised electrons. The measurements are based on an integrated luminosity of 177 pb-1 collected by the ZEUS detector from 2004 to 2006 with a centre-of-mass energy of 318 GeV. The structure function xF3 is measured by combining the e-p data presented in this paper with previously measured unpolarised e+p neutral current data. The asymmetry parameter A- is used to demonstrate the parity violating effects of electroweak interactions. The Standard Model agrees well with all measurements. Strong Interactions Submitted also to High-Energy Electroweak Physics halina@mail.desy.de
81 ZEUS Collaboration Measurement of high-Q2 neutral current deep inelastic e- p scattering cross sections with longitudinally polarised electrons at ZEUS Measurements of the neutral current cross sections for deep inelastic scattering in e-p collisions at HERA with longitudinally polarised electron beams are presented. Single differential cross sections in Q2, x and y, and double differential cross sections in Q2 and x are shown in the kinematic region of Q2 > 185 GeV2 separately for positively and negatively polarised electrons. The measurements are based on an integrated luminosity of 177 pb-1 collected by the ZEUS detector from 2004 to 2006 with a centre-of-mass energy of 318 GeV. The structure function xF3 is measured by combining the e-p data presented in this paper with previously measured unpolarised e+p neutral current data. The asymmetry parameter A- is used to demonstrate the parity violating effects of electroweak interactions. The Standard Model agrees well with all measurements. High-Energy Electroweak Physics Submitted also to Strong Interactions halina@mail.desy.de
82 ZEUS Collaboration Measurement of high-Q2 charged current deep inelastic scattering cross sections with a longitudinally polarised electron beam at HERA Measurements of the cross sections for charged current deep inelastic scattering in e-p collisions with a longitudinally polarised electron beam are presented. The measurements are based on a data sample with an integrated luminosity of 174 pb-1 collected with the ZEUS detector at HERA from 2004 to 2006 at a centre-of-mass energy of 318 GeV. The total cross section is presented at positive and negative values of the longitudinal polarisation of the electron beam. A fit to these measurements yields an upper limit on the right-handed charged cross section and a lower limit on the mass of a right-handed W boson. The differential cross sections dσ/dQ2, dσ/dx and dσ/dy for Q2>200 GeV2 are presented. In addition d2σ/dxdQ2 has been measured in the kinematic range 280 GeV2 < Q2 < 30000 GeV2 and 0.015 < x < 0.65. The measured cross sections are compared with the predictions of the Standard Model. An electroweak analysis of the measurements yields a value for the mass of the W boson. Strong Interactions Submitted also to High-Energy Electroweak Physics halina@mail.desy.de
83 ZEUS Collaboration Measurement of high-Q2 charged current deep inelastic scattering cross sections with a longitudinally polarised electron beam at HERA Measurements of the cross sections for charged current deep inelastic scattering in e-p collisions with a longitudinally polarised electron beam are presented. The measurements are based on a data sample with an integrated luminosity of 174 pb-1 collected with the ZEUS detector at HERA from 2004 to 2006 at a centre-of-mass energy of 318 GeV. The total cross section is presented at positive and negative values of the longitudinal polarisation of the electron beam. A fit to these measurements yields an upper limit on the right-handed charged cross section and a lower limit on the mass of a right-handed W boson. The differential cross sections dσ/dQ2, dσ/dx and dσ/dy for Q2>200 GeV2 are presented. In addition d2σ/dxdQ2 has been measured in the kinematic range 280 GeV2 < Q2 < 30000 GeV2 and 0.015 < x < 0.65. The measured cross sections are compared with the predictions of the Standard Model. An electroweak analysis of the measurements yields a value for the mass of the W boson. High-Energy Electroweak Physics Submitted also to Strong Interactions halina@mail.desy.de
84 ZEUS Collaboration Combined Electroweak and QCD analysis of ZEUS data, including DIS cross sections with polarised lepton beams A NLO QCD analysis on ZEUS jet-production data and inclusive cross-section data, including data with polarised lepton beams, is presented. The analysis is used to extract the parton distribution functions of the proton and is extended to fit electroweak parameters. Strong Interactions halina@mail.desy.de
85 ZEUS Collaboration Measurement of High-Q2 Deep Inelastic Scattering Cross Sections with a Longitudinally Polarised Positron Beam at HERA The cross sections for charged- and neutral-current deep inelastic scattering in e+p collisions with a longitudinally polarised positron beam have been measured using the ZEUS detector at HERA. The results, based on data corresponding to an integrated luminosity of 140 pb-1 at sqrt{s}=318 GeV, are given for both positive and negative values of the longitudinal polarisation of the positron beam. Single differential cross sections are presented for the kinematic region Q2>200 GeV2. The measured cross sections are compared to the predictions of the Standard Model. Strong Interactions Submitted also to High-Energy Electroweak Physics halina@mail.desy.de
86 ZEUS Collaboration Measurement of High-Q2 Deep Inelastic Scattering Cross Sections with a Longitudinally Polarised Positron Beam at HERA The cross sections for charged- and neutral-current deep inelastic scattering in e+p collisions with a longitudinally polarised positron beam have been measured using the ZEUS detector at HERA. The results, based on data corresponding to an integrated luminosity of 140 pb-1 at sqrt{s}=318 GeV, are given for both positive and negative values of the longitudinal polarisation of the positron beam. Single differential cross sections are presented for the kinematic region Q2>200 GeV2. The measured cross sections are compared to the predictions of the Standard Model. High-Energy Electroweak Physics Submitted also to Strong Interactions halina@mail.desy.de
87 ZEUS Collaboration Measurement of Multi-lepton Production with the ZEUS detector at HERA Multi-lepton production is studied in positron-proton and electron-proton collision data. Multi-electron and multi-muon event topologies are studied. The data was collected during 1996-2007 using the ZEUS detector at HERA. The results are compared with the Standard Model prediction. Deviations from the Standard Model at high dilepton invariant mass are searched for. High-Energy Electroweak Physics Submitted also to Physics Beyond the Standard Model halina@mail.desy.de
88 ZEUS Collaboration Measurement of Multi-lepton Production with the ZEUS detector at HERA Multi-lepton production is studied in positron-proton and electron-proton collision data. Multi-electron and multi-muon event topologies are studied. The data was collected during 1996-2007 using the ZEUS detector at HERA. The results are compared with the Standard Model prediction. Deviations from the Standard Model at high dilepton invariant mass are searched for. Physics Beyond the Standard Model Submitted also to High-Energy Electroweak Physics halina@mail.desy.de
89 ZEUS Collaboration Search for contact interactions with the ZEUS detector in HERA data A search for physics beyond the Standard Model is performed with high-Q2 neutral current deep inelastic scattering events. New data on scattering of longitudinally polarized electrons and positrons from HERA II running are combined with electron and positron data from HERA I. No significant deviations from the Standard Model predictions are observed. Limits are derived on the effective mass scale in eeqq contact interactions, on the mass to the Yukawa coupling ratio for heavy-leptoquark models, on the effective Planck-mass scale in models with large extra dimensions and on the quark charge radius. Physics Beyond the Standard Model halina@mail.desy.de
90 KLOE Collaboration KLOE measurement of the scalar Form-Factor slope for K_L -> pi mu nu Semileptonic kaon decays offer possibly the cleanest way to obtain an accurate value of the Cabibbo angle, or better, Vus. At present, the largest uncertainty in calculating Vus from the decay rate, is due to the difficulties in computing the matrix element of the K -> pi transition. The matrix element of K_L -> pi mu nu decay is expressed in terms of kaon and pion four-momenta, P and p respectively, and using form factors f+(t) and f0(t), where t=(P-p)2. It is customary to expand the scalar form factor f0(t) in powers of t as f0(t)=f+(0)[1+lambda0 t/m2+..], where m is the mass of the charged pion, and only the linear term is retained. The form factor at zero momentum transfer, f+(0), is valuated from theory, while the form factor slope, lambda0, has to be determined experimentally from K_L -> pi mu nu decay spectra. The best sensitivity to lambda0 is achieved in KLOE by using the neutrino energy spectrum. Such a measurement is possible because of the tagging technique, consisting of identifying K_L decays through the selection of K_S -> pi+pi- decay near the e+e- interaction point. This strategy allows to measure KL momentum with good precision. We present the results of this analysis, based on 330 pb^-1 of data acquired during years 2001 and 2002. Flavour Physics and CP Violation giorgio.capon@lnf.infn.it
91 KLOE Collaboration KLOE measurement of BR(K_L -> pi e nu gamma) The study of radiative K_L decays offers the possibility to obtain informations on kaon structure and to test predictions of the Chiral Perturbation Theory. Two different processes contribute to photon emission in K_L -> pi e nu gamma decay (KLe3g in the following): the inner bremsstrahlung (IB) and the direct emission (DE). The latter is due to photon radiation from intermediate hadronic states. To compare with theoretical predictions and present best experimental results, we measured the ratio R = BR(KLe3g; E*>30 MeV, theta*>20deg)/BR(KLe3), where E* and theta* are the photon energy and the angle between electron and photon in K_L rest frame, respectively. With these cuts the theoretical predictions for R range between 0.95% and 0.99% . The DE contribution is expected to be less than 1% of the IB one. KLOE measurement benefits of the tagging technique, which consists of identifying K_L decays through the selection of K_S -> pi+pi- decay near the e+e- interaction point. This strategy allows to achieve an optimal background rejection, and also to measure K_L momentum with good precision. We present the results of this analysis, based on 330 pb^-1 of data acquired during years 2001 and 2002. Flavour Physics and CP Violation giorgio.capon@lnf.infn.it
92 KLOE Collaboration Direct search of K_S -> e+e- decay with the KLOE detector K_S -> e+e- decay is a DeltaS = 1 weak neutral current process. The Standard Model expectation for its BR is 1.6*10^-15, which has been evaluated by Chiral Perturbation Theory with 10% error. The best experimental limit on this decay, achieved by CPLEAR experiment, is BR<1.4*10^-7 at 90% CL. We performed a direct search of K_S -> e+e- decay by analysing 1.3 fb^-1 of data. The analysis exploits the excellent KLOE drift chamber momentum resolution to identify the signal through e+e- invariant mass reconstruction. Further background rejection comes from calorimeter particle identification, which is based on time of flight, shower longitudinal profile and E/p. The result of this search is presented, which improves on the previous experimental limit by a factor of 10. Flavour Physics and CP Violation giorgio.capon@lnf.infn.it
93 KLOE Collaboration KLOE measurement of BR(K_S -> gamma gamma) A precise measurement of the K_S -> gamma gamma rate is an important test of Chiral Perturbation Theory predictions. The decay amplitude can be evaluated at the leading p4 order providing an estimate of the BR for this decay of (2.1+-0.1)*10^-6. The latest experimental determination of BR(K_S -> gamma gamma) is a precise measurement from NA48, (2.78+-0.07)*10^-6, which differs from ChiPT p4 prediction of about 30%. This seems to indicate the presence of important contributions from higher order corrections. KLOE analysis on 1.6 fb^-1 of data acquired during years 2001-2002 and 2004-2005 benefits from the tagging technique, which allows for the first time this decay to be identified with a pure K_S ``beam'', without the background from K_L -> gamma gamma decay, and with completely different systematics respect to fixed target experiments. Event counting is performed from a fit to the bidimensional distribution of the two-photon invariant mass versus the angle between photon momenta in the K_S rest frame. In this plane the best separation is achieved between the signal and the main source of background, which is represented by K_S -> pi0pi0 events with two missing photons. The result of this analysis is presented, which is competitive with present measurements. Flavour Physics and CP Violation giorgio.capon@lnf.infn.it
94 Antoni Szczurek and Sergey Baranov "Inclusive $J/\psi$ production in pp collisions at RHIC" Inclusive cross sections for $J/\psi$ production in proton-proton collisions were calculated in the $k_t$-factorization approach for the RHIC energy. Different unintegrated gluon distributions from the literature were used. Several mechanisms were considered, including direct color-singlet mechanism, radiative decays of $\chi_c$ mesons, decays of $\psi'$, open-charm associated production of $J/\psi$ as well as weak decays of B mesons. Surprisingly, we have found that radiative $\chi_c$ decays constitute the dominant mechanism of $J/\psi$ production. This process cannot be consistently treated within collinear-factorization approach. Our results were compared with recent RHIC data. The new precise data at small transverse momenta impose stringent constraints on UGDFs. Many UGDFs from the literature are inconsistent with the new data. The Kwieci\'nski UGDFs give the best description of the data. In order to verify the mechanism suggested here we propose $J/\psi$ -- jet correlation measurement and an independent measurement of $\chi_c$ meson production in $\pi^+ \pi^-$ and/or $K^+ K^-$ decay channels. Strong Interactions Quite new view of J/psi production will be shown antoni.szczurek@ifj.edu.pl
95 Antoni Szczurek Exclusive production of scalar, pseudoscalar and vector quarkonia in pp and ppbar collisions at high energies We discuss double-diffractive double-elastic production of the $\eta'$-meson in the $pp \to p\eta'p$ reaction within the formalism of unintegrated gluon distribution functions (UGDF). We estimate also the contribution of $\gamma^* \gamma^* \to \eta'$ fusion. The distributions in the Feynman $x_F$ (or rapidity), transferred four-momentum squared between initial and final protons ($t_1$, $t_2$) and azimuthal angle difference between outgoing protons ($\Phi$) are calculated. The deviations from the $\sin^2(\Phi)$ dependence predicted by one-step vector-vector-pseudoscalar coupling are quantified and discussed. The results are compared with the results of the WA102 collaboration at CERN. Most of the models of UGDF from the literature give too small cross section as compared to the WA102 data and predict angular distribution in relative azimuthal angle strongly asymmetric with respect to $\pi/2$. This points at a different mechanism at the WA102 energy. Predictions for RHIC, Tevatron and LHC are given. We find that the normalization, $t_{1,2}$ dependence as well as deviations from $\sin^2(\Phi)$ of double-diffractive double-elastic cross section are extremely sensitive to the choice of UGDF. Possible implications for UGDFs are discussed. We calculate several differential distributions for exclusive scalar heavy quarkonia ($\chi_c(0^{++})$ and $\chi_b(0^{++}$)) production in proton-antiproton collisions at the Tevatron energy in terms of UGDFs. The $g^* g^* \to \chi_Q$ transition form factors are calculated as a function of gluon virtualities. Different models of UGDFs are used. We discuss correlations in azimuthal angle between outgoing proton and antiproton. Distortions from $cos^2(\Phi)$ are obtained and discussed. The role of the second form factor is quantified. Approximations used in the literature are discussed in detail. We calculate several differential distributions in $t_1, t_2, x_F, \phi$ for exclusive $J/\Psi$ production in proton-proton (RHIC, LHC) and proton-antiproton (FAIR, Tevatron) collisions. The photon-pomeron and pomeron-photon exchanges are included in a vector-dominance -- soft pomeron exchange model and in a QCD-inspired model based on the formalism of unintegrated gluon distributions (UGDF). Different models of UGDFs are used. We discuss correlations in azimuthal angle between outgoing proton and antiproton and in the ($t_1, t_2$) space. The cross section of the photon-pomeron and pomeron-photon exchange dominate at $y \ll$ 0 and $y \gg$ 0, respectively. This opens a possibility to study exclusive photoproduction of heavy vector mesons at energies much larger than possible at the HERA accelerator. Large interference terms are found in the broad range of rapidities and transverse momenta. The reaction discussed here constitutes dominant nonreduceable background in recently proposed searches for odderon exchange. Strong Interactions "This is based on results obtained recently in collaboration with R.Pasechnik, O.Teryaev and W. Schaefer" antoni.szczurek@ifj.edu.pl
96 ZEUS Collaboration Measurement of D* Meson Production in DIS ep Scattering at Low Q2 The production of D*(2010) mesons in ep scattering in the range of exchanged photon virtuality 0.05 < Q^2 < 0.7 GeV^2 has been measured with the ZEUS detector at HERA using an integrated luminosity of 82 pb^-1. The decay channels D*+ -> D0 pi+ with D0 -> K- pi+ and corresponding antiparticle decay were used to identify D* mesons and the ZEUS beampipe calorimeter was used to identify the scattered electron. Differential D* cross-sections as functions of Q^2, inelasticity, y, transverse momentum of the D* meson, p_T(D*), and pseudorapidity of the D* meson, eta(D*) have been measured in the kinematic region, 0.02 Strong Interactions halina@mail.desy.de
97 ZEUS Collaboration Measurements of Charm Production Cross Sections and Fragmentation Fractions in DIS Charm production in deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 82 pb-1. Charm has been tagged by reconstructing D*+, D0, D+ and Ds+ (+ c.c.) charm mesons. The charm hadrons were measured in the kinematic range pT(D*+,D0,D+) > 3 GeV, pT(Ds+)>2 GeV and |eta(D)| < 1.6 for 1.5 < Q^2 < 1000 GeV^2 and 0.02 < y < 0.7. The production cross sections were used to extract charm fragmentation ratios and the fraction of c quarks hadronising into a particular charm meson in the kinematic range considered. The cross sections were compared to the predictions of next-to-leading-order QCD, and extrapolated to the full kinematic region in pT(D) and eta(D) in order to determine the open-charm contribution, F2ccbar(x,Q^2), to the proton structure function F2. Strong Interactions Also submitted to Flavor Physics and CP Violation halina@mail.desy.de
98 ZEUS Collaboration Measurements of Charm Production Cross Sections and Fragmentation Fractions in DIS Charm production in deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 82 pb-1. Charm has been tagged by reconstructing D*+, D0, D+ and Ds+ (+ c.c.) charm mesons. The charm hadrons were measured in the kinematic range pT(D*+,D0,D+) > 3 GeV, pT(Ds+)>2 GeV and |eta(D)| < 1.6 for 1.5 < Q^2 < 1000 GeV^2 and 0.02 < y < 0.7. The production cross sections were used to extract charm fragmentation ratios and the fraction of c quarks hadronising into a particular charm meson in the kinematic range considered. The cross sections were compared to the predictions of next-to-leading-order QCD, and extrapolated to the full kinematic region in pT(D) and eta(D) in order to determine the open-charm contribution, F2ccbar(x,Q^2), to the proton structure function F2. Flavour Physics and CP Violation Also submitted to Strong Interactions halina@mail.desy.de
99 ZEUS Collaboration Diffractive Photoproduction of D*+/-(2010) at HERA Diffractive photoproduction of D*+/-(2010) mesons was measured with the ZEUS detector at the ep collider HERA, using an integrated luminosity of 78.6 pb-1. The D* mesons were reconstructed in the kinematic range: transverse momentum p_T(D*) > 1.9 GeV and pseudorapidity -1.6 < eta(D*) < 1.6, using the decay D*+ -> D0 pi+_s followed by D0 -> K- pi+ (+c.c.). Diffractive events were identified by a large gap in pseudorapidity between the produced hadronic state and the outgoing proton. Cross sections are reported for photon-proton centre-of-mass energies in the range 130 < W < 300 GeV and for photon virtualities Q^2 < 1 GeV^2, in two ranges of the Pomeron fractional momentum x_pom < 0.035 and x_pom < 0.01. The relative contribution of diffractive events to the inclusive D*+/-(2010) photoproduction cross section is about 6%. The data are in agreement with perturbative QCD calculations based on various parameterisations of diffractive parton distribution functions. The results are consistent with diffractive QCD factorisation. Strong Interactions halina@mail.desy.de
100 ZEUS Collaboration Measurement of open beauty production at HERA in the D* muon final state The production of beauty quarks with a D* and a muon in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb-1. Low transverse momentum thresholds for the muon and D* meson allow a measurement of beauty production closer to the production threshold than previous measurements. The beauty signal was extracted using the charge correlations and angular distributions of the muon with respect to the D* meson. Cross sections for photoproduction and deep inelastic scattering are somewhat higher than, but compatible with, next-to-leading-order QCD predictions, and compatible with other measurements. Strong Interactions May be of interest also to Flavour Physics and CP Violation halina@mail.desy.de
101 ZEUS Collaboration Measurement of excited charm and charm-strange mesons production at HERA The production of excited charm, D_1(2420)^0 and D_2^*(2460)^0, and charm-strange, D_s1(2536)+/-, mesons has been measured with the ZEUS detector at HERA using an integrated luminosity of 126 pb^-1. The mesons have been reconstructed in the D^*+ pi^-, D^+ pi^-, D^*+ K^0_s and D^0 K^+ (+c.c.) final states. The measured yields have been converted to the rates of c quarks hadronising as a given excited D meson and to the ratios of the dominant D_2^*(2460)^0 and D_s1(2536)+/- branching ratios. A search for the radially excited charm meson, D^*(2640)+/-, in the D^*+ pi^+ pi^- (+c.c.) final state has been also performed. The results are compared with those measured previously and with theoretical expectations. Flavour Physics and CP Violation halina@mail.desy.de
102 ZEUS Collaboration Measurement of beauty production from dimuon events at HERA Beauty production with events in which two muons are observed in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb-1. A low pt threshold for muon identification, in combination with the large rapidity coverage of the ZEUS muon system, gives access to essentially the full phase space for beauty production. The total cross section for beauty production in ep collisons at sqrt(s)=318 GeV has been measured. Differential cross sections and a measurement of bbbar correlations are also obtained, and compared to other beauty cross section measurements, MC models, and NLO QCD predictions. The latter agree with the data within errors, but tend to lie below the measurements. The shapes of all distributions are well described. Strong Interactions May be of interested also to Plavour Physics and CP Violation halina@mail.desy.de
103 ZEUS Collaboration Measurement of the charm fragmentation function in D* photoproduction at HERA The charm fragmentation function has been measured in D* photoproduction with the ZEUS detector at HERA using an integrated luminosity of 120 pb-1. The fragmentation function is measured versus z, the ratio of E+p_parallel for the D* meson and that for the associated jet, where E is the energy and p_parallel the longitudinal momentum relative to the jet axis. Jets were reconstructed using the k_T clustering algorithm and required to have transverse energy greater than 9 GeV. The D* meson associated with the jet was required to have a transverse momentum greater than 2 GeV. The measured function is compared to different fragmentation models incorporated in leading-logarithm Monte Carlo simulations and a next-to-leading-order calculation. The results are similar to those from e+e- experiments. Strong Interactions Also submitted to Flavour Physics and CP Violation halina@mail.desy.de
104 ZEUS Collaboration Measurement of the charm fragmentation function in D* photoproduction at HERA The charm fragmentation function has been measured in D* photoproduction with the ZEUS detector at HERA using an integrated luminosity of 120 pb-1. The fragmentation function is measured versus z, the ratio of E+p_parallel for the D* meson and that for the associated jet, where E is the energy and p_parallel the longitudinal momentum relative to the jet axis. Jets were reconstructed using the k_T clustering algorithm and required to have transverse energy greater than 9 GeV. The D* meson associated with the jet was required to have a transverse momentum greater than 2 GeV. The measured function is compared to different fragmentation models incorporated in leading-logarithm Monte Carlo simulations and a next-to-leading-order calculation. The results are similar to those from e+e- experiments. Flavour Physics and CP Violation Also submitted to Strong Interactions halina@mail.desy.de
105 ZEUS Collaboration Beauty Production at ZEUS using Semileptonic Decays into Electrons Beauty quark production in ep collisions has been studied using the data collected in 1996-2000 with the ZEUS detector at HERA, which corresponds to an integrated luminosity of 120 pb-1. Photoproduction (Q^2 < 1 GeV^2) events with two jets and an electron candidate are selected in order to study semileptonic decays of beauty quarks into electrons. For electron identification several discriminating input variables are combined in a likelihood test function. With this statistical method both the fractions of beauty and charm in the sample could be determined. Total and differential cross-sections have been measured and are compared to QCD predictions. Strong Interactions halina@mail.desy.de
106 ZEUS Collaboration Measurement of F_2charm at HERA Inclusive production of D*(2010) mesons in deep inelastic scattering has been measured with the ZEUS detector at HERA II using the data taken during the 2003-5 running period. Differential D* cross sections are compared to next-to-leading-order QCD theoretical predictions. The observed cross section is extrapolated to the full kinematic region in pt(D*) and eta(D*) in order to determine the open charm contribution, F_2^{ccbar}, to the proton structure function. The data from HERA I and HERA II are compared to those from the QCD fit. Strong Interactions halina@mail.desy.de
107 ZEUS Collaboration Charm production at HERA using Lifetime tags Charm production has been measured with the ZEUS detector at HERA II using the silicon vertex detector. The vertex detector was installed during the HERA upgrade to improve the tracking and vertexing. The resolution of the vertex detector allows charm to be selected by measuring the secondary vertex from a D-meson decay or from the impact parameter of identified leptons. Cross sections from the 2003-2005 data based on lifetime tags are presented and compared to pQCD predictions. Strong Interactions halina@mail.desy.de
108 ZEUS Collaboration Measurement of beauty production in deep inelastic scattering at HERA Beauty production in deep inelastic scattering with events in which a muon and a jet are observed in the final state has been measured with the ZEUS detector including HERA II data. Differential cross sections in Q^2, p_T(mu), eta(mu), p_T(jet) and eta(jet) are compared to theoretical predictions. Double differential cross sections are measured and the open beauty contribution F_2^{bbbar} to the proton structure function is determined. Strong Interactions halina@mail.desy.de
109 ZEUS Collaboration Measurement of beauty production in deep inelastic scattering at HERA Beauty production in deep inelastic scattering with events in which a muon and a jet are observed in the final state has been measured with the ZEUS detector including HERA II data. Differential cross sections in Q^2, p_T(mu), eta(mu), p_T(jet) and eta(jet) are compared to theoretical predictions. Double differential cross sections are measured and the open beauty contribution F_2^{bbbar} to the proton structure function is determined. Strong Interactions halina@mail.desy.de
110 ZEUS Collaboration Measurement of Beauty Photoproduction in dijet events at HERA Beauty photoproduction in dijet events has been measured at HERA with the ZEUS detector. Beauty was identified in events with a muon in the final state by using the transverse momentum of the muon relative to the closest jet. Lifetime information from the silicon vertex detector was also used to identify the long-lived particles: the impact parameter of the muon or the displacement of a secondary vertex with respect to the primary vertex were exploited to discriminate between beauty and background. Cross sections are measured and compared with QCD predictions and previous measurements. Strong Interactions halina@mail.desy.de
111 ZEUS Collaboration Measurement of inelastic J/psi helicity distributions using The decay angular distributions for inelastic photoproduction of J/psi mesons have been measured in ep collisions with the ZEUS detector at HERA using an integrated luminosity of ~250 pb-1 collected between 2003 and 2006. J/psi mesons are identified using the decay mode J/psi \rightarrow mu^+ mu^- and were measured in the range 50 < W < 180 GeV, where W is the photon--proton centre--of--mass energy. The polar and azimuthal distributions of the mu^+ in the J/psi rest frame are measured as a function of p_T, for p_T > 1 GeV and z > 0.4, and as function of z, for p_T > 1 GeV and 0.1 < z < 0.9, where p_T is the transverse momentum of the J/psi in the laboratory frame and z is the fraction of the incident photon energy carried by the J/psi in the proton rest frame. The experimental results are compared to the ZEUS and H1 results obtained using HERA I data. ZEUS combined HERA I and HERA II measurements are also shown and compared with theoretical predictions at leading order Strong Interactions halina@mail.desy.de
112 Aidan Robson (CDF Collaboration) Searches for Higgs->WW at CDF We present results from the CDF experiment at the Tevatron of searches for a Standard Model Higgs boson in its decay to two W bosons, where the W bosons each decay to an electron or muon. These channels provide good sensitivity to a high mass Higgs, such that for Higgs masses of around 160GeV/c2 the expected cross-section exclusion limit in the case of non-observation is close to the Standard Model cross-section prediction. High-Energy Electroweak Physics a.robson@physics.gla.ac.uk
113 ZEUS Collaboration Measurement of Prompt Photons with Associated Jets in Photoproduction at HERA The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb-1. Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential gamma+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x(gamma)^obs, the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading- order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the kT-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the kT-factorisation calculations are in good agreement with the data. Strong Interactions Resubmitted as was non-confirmed first time halina@mail.desy.de
114 ZEUS Collaboration Measurements of (anti)deuteron and (anti)proton production in DIS at HERA A first observation of (anti)deuterons in deep inelastic ep scattering (DIS) with the ZEUS detector at HERA is reported. The data sample consists of DIS events at a centre-of-mass energy of 300-318 GeV, and corresponds to 120 pb-1 integrated luminosity. The measurements are performed in the central rapidity region for the transverse-momentum per nucleon mass between 0.3 and 0.7. The particle rates were extracted and interpreted in terms of the coalescence model. The (anti)deuteron production rate is approximately three orders of magnitude suppressed relative to the (anti)proton yield, which is consistent with the world measurements. Strong Interactions Submitted second time with typo corrected in the title halina@mail.desy.de
115 ZEUS Collaboration Multi-jet final states in photoproduction at HERA Three- and four-jet final states have been measured in photoproduction at HERA using the ZEUS detector and an integrated luminosity of 121 pb-1. The three-jet results are presented in a wider phase-space and are based on over seven times the luminosity of the previous HERA publication. The four-jet photoproduction cross section has been measured for the first time and represents the highest order process studied at HERA. The events have been studied in a low-, 25 < Mnj < 50 GeV, and a high-mass region, Mnj > 50 GeV, where Mnj is the invariant mass of the n-jet system. The three-jet cross sections have been compared to an order alpha_s squared perturbative QCD calculation. In addition, both the three- and four-jet cross sections have been compared with leading-logarithmic parton-shower Monte Carlo models, with and without multi-parton interactions. Strong Interactions "Previously submitted with the wrong title of ""Measurements of (anti)deauteron....""" halina@mail.desy.de
116 Sudhir Malik Construction of the CMS Forward Pixel Detector At the core of CMS all-silicon tracker is the Pixel Detector. It provides fine granularity for the charged track reconstruction with 3D-space measurements and resolution on the order of ten microns. It comprises of two pixel disks on either side of the interaction region and three barrel pixel layers. The disks are called the Forward Pixel detector and are being assembled at Fermilab, U.S.A. The detector modules for the disks consist of eighteen million pixels. After successful completion of a small slice of this detector for the 2007 pilot physics run of the LHC, we are on our way to finish the assembly and construction of the four disks, for a scheduled insertion into CMS in 2008. An overview of the detector and its latest construction status will be presented Detectors and Data Handling malik@fnal.gov
117 Neeti Parashar Geometry Simulation and Physics with the CMS Forward Pixel Detector The Forward Pixel Detector of CMS is an integral part of the Tracking system, which would play a key role in addressing the full physics potential of the collected data. It has a very complex geometry that encompasses multilayer structure of its detector modules. This presentation will describe the development of geometry simulation for the Forward Pixel Detector. A new geometry package has been developed, which uses the detector description database (DDD) interface for the XML (eXtensive Markup Language) to GEANT simulation. This is necessary for digitization and GEANT4 reconstruction software for tracking. The expected physics performance shall also be discussed. Detectors and Data Handling neeti@fnal.gov
118 A. Drago, A. Lavagno Isospin dependence of quark deconfinement in heavy ion collisions We study the transition from hadronic matter to a mixed phase of quarks and hadrons at high baryon and isospin densities, reached in heavy-ion collisions. We study in detail the formation of a drop of quark matter in the mixed phase and we discuss the effects on the quark drop nucleation probability of the finite size and finite time duration of high density region [1]. We apply this technique to the interpretation of the recent analysis of heavy ion scattering at energies of 2-10 A GeV [2], indicating a significant reduction of the nuclear incompressibility. We fix the parameters of the MIT bag model to reproduce the observed reduction of the incompressibility. Finally, we discuss the implications of our results for the structure and formation of compact stars [4,5]. [1] M. Di Toro, A. Drago, T. Gaitanos, V. Greco, A. Lavagno, Nucl. Phys. A 775, 102 (2006). [2] V.N. Russkikh, Yu.B. Ivanov, Phys. Rev. C 74, 034904 (2006). [3] L. Bonanno, A. Drago, A. Lavagno, in preparation. [4] Z. Berezhiani, I. Bombaci, A. Drago, F. Frontera, A. Lavagno, Astrophys. J. 586, 1250 (2003). [5] A. Drago, A. Lavagno, I. Parenti, astro-ph/0512652, Astrophys. J. in press. High-Energy Nuclear Physics andrea.lavagno@polito.it
119 Mario Campanelli (CDF coll.) Measurement of heavy flavor production associated with a photon We report on a study of events containing a photon and heavy flavor jets in data taken by the CDF experiment at the Fermilab Tevatron collider. This measurement is performed using a dedicated dataset that exploits the silicon vertex trigger to enrich the b-jet content, and therefore lower the photon threshold. Results are compared to QCD predictions as a function of relevant kinematic variables. Strong Interactions mario.campanelli@cern.ch
120 Sandro De Cecco - INFN Rome Italy - CDF Collaboration Measurement of the Z boson associated production with Heavy Flavor jets at CDF Production of Z boson in association with b or c quark is an important background to Higgs searches at the Tevatron collider and an interesting test ground for QCD calculations. We will present this measurement in two approaches using different b-tagging techniques: a traditional secondary vertex b-tag and a newly developped neural net tagging algorithm. In the latter a sophisticated vertexing algorithm is used to select all the displaced vertices and charged particles produced in the decays of heavy flavor hadrons present in b and c quark jets. All avaliable information on jet tracks and vertices is used in a neural net to enhance the b to light-jet and b to c-jet separation, the final discriminant variable is then fitted to measure the heavy flavour fractions. Strong Interactions sandro.dececco@roma1.infn.it
121 Michal Kreps (CDF Collaboration) Latest Results on B-hadron Spectroscopy from CDF We review the latest results on the spectroscopy of B-hadrons from 1 fb$^{-1}$ of CDF data. The measurements are performed with fully reconstructed B-hadron decays collected with the CDF II detector at $\sqrt{s} = 1.96$ TeV. The main highlights are the results on the orbitally excited $B$ and $B_s$ mesons and observation of the new B-baryons. Flavour Physics and CP Violation kreps@ekp.uni-karlsruhe.de
122 A. Donini, E. Fernandez-Martinez, P. Migliozzi, L. Scotto Lavinia, M. Selvi, F. Terranova and T. Tabarelli de Fatis Neutrino hierarchy from atmospheric and beta beam neutrinos with high density magnetized detectors High density magnetized detectors are well suited to exploit the outstanding purity and intensities of novel neutrino sources like Neutrino Factories and Beta Beams. They can also provide independent measurements of leptonic mixing parameters through the observation of atmospheric muon-neutrinos. In this paper, we discuss the combination of these observables from a multi-kton iron detector and a high energy Beta Beam; in particular, we demonstrate that even with moderate detector granularities the neutrino mass hierarchy can be determined for $\theta_{13}$ values greater than 4$^\circ$. Neutrino Physics tommaso.tabarelli@mib.infn.it
123 KLOE Collaboration KLOE measurement of the charged kaon lifetime The charged K lifetime is an experimental input to the determination of Vus. The present fractional uncertainty is about 0.2%, however the available data show large discrepancies between the measurements done using charged kaon decays in-flight and at-rest. At KLOE two different methods have been developed: one based on the measurement of the charged kaon decay length and the other based on its decay time. Both methods allow us to reach accuracies at the few per mil level and together allow us to assess part of the systematic uncertainty. Efficiency and resolution functions are measured directly on data using an independent control sample. The measurement of the charged kaon lifetime, based on about 260 pb-1 of the total integrated luminosity (2.5 fb-1), will be presented. Flavour Physics and CP Violation giorgio.capon@lnf.infn.it
124 KLOE Collaboration KLOE measurement of the charged kaon absolute semileptonic BR's The most precise evaluation of the CKM matrix element |Vus| is obtained using semileptonic decays of the kaons. At KLOE the measurement of the branching ratios for the charged K semileptonic decays uses four independent samples tagged by the following kaon decays: K+ -> mu2, K+ -> pi2, K- -> mu2, and K- -> pi2. Using 410 pb-1 of total integrated luminosity (2.5 fb-1), about 60 million tag decays have been identified and divided into the four tag samples. This redundancy allows us to keep under control the systematic effects due to the tag selection. The BR is evaluated separately for each tag sample, dividing by the number of tag counts and correcting for acceptances. The latter are obtained from MC simulations. Corrections are applied to account for data-MC differences in tracking and clustering. K+-e3 and K+-mu3 decays are selected using kinematical cuts in the kaon rest frame and time of flight particle identification. The measurement of these BR's will be presented. Flavour Physics and CP Violation giorgio.capon@lnf.infn.it
125 KLOE Collaboration KLOE measurement of the absolute BR(K+ -> pi pi0) A new precise measurement of the absolute branching ratio BR(K+ -> pi+ pi0 (gamma)) has an important impact on the world average of the charged kaon semileptonic BR's since the NA48, ISTRA+ and E865 experiments use this two-body decay in the normalization sample. At KLOE a pure K+ beam is tagged by the recostruction of the K- -> mu- nu decays. The signal counting is given by a fit to the distribution of the momentum of the charged decay particle in the kaon rest frame assuming the pion mass. The shapes of the signal and of the backgrond (K+ -> mu nu and three-body decays) are obtained from data control samples and MC. The efficiency is measured directly on data using an independent control sample. The measurement of the BR(K+ -> pi+ pi0 (gamma)), based on about 260 pb-1 of the total integrated luminosity (2.5 fb-1), will be presented. Flavour Physics and CP Violation giorgio.capon@lnf.infn.it
126 B. Pinto (Universidade de Lisboa), S. Marti i Garcia (IFIC-Valecnia, UV-CSIC), J. Schieck (MPI Muenchen) Alignment data streams for the ATLAS Inner Detector The ATLAS experiment uses a complex trigger strategy to be able to achieve the necessary Event Filter rate output, making possible to optimize the storage and processing needs of these data. These needs are described in the ATLAS Computing Model which embraces Grid concepts. The output coming from the Event Filter will consist of four main streams: the physical stream, express stream, calibration stream, and a diagnostic stream. The calibration stream will be transferred to the Tier-0 facilities which will provide the prompt reconstruction of this stream with a minimum latency of 8 hours, producing calibration constants of sufficient quality to permit a first-pass processing. The Inner Detector community is developing and testing an independent common calibration stream selected at the Event Filter after track reconstruction. It is composed of raw data, in byte-stream format, contained in ROB's with hit information of the selected tracks, and it will be used to derive and update a set of calibration and alignment constants after every fill. This option was selected because makes use of the Byte Stream Converter infrastructure and possibly give us a better bandwidth usage and storage capability's. Processing is done using specialized algorithms running in Athena framework in dedicated Tier-0 resources, and the alignment constants will be stored and distributed using the COOL conditions database infrastructure. The work is addressing in particular the alignment requirements, the needs for track and hit selection and the timing issues. Detectors and Data Handling oral presentation Salvador.Marti@ific.uv.es
127 M.J. Costa on behalf of the ATLAS collaboration Commissioning of the ATLAS offline software with cosmic rays The ATLAS experiment of the LHC is now taking its first data by collecting cosmic ray events. The full reconstruction chain including all sub-systems (inner detector, calorimeters and muon spectrometer) is being commissioned with this kind of data for the first time. Specific adaptations to deal with particles not coming from the interaction point and not synchronized with the readout clock were needed. Data decoders and the infrastructure to deal with conditions data as those coming from the data acquisition configuration, detector control system, calibration and alignment corrections were developed and validated as well. Detailed analysis are being performed in order to provide ATLAS with its first alignment and calibration constants and to study the combined muon performance. Combined monitoring tools and event displays have also been developed to ensure the good data quality. A simulation of cosmic events according to the different detector and trigger setups has also been provided to verify it gives a good description of the data. Detectors and Data Handling Maria.Jose.Costa@cern.ch
128 P. Miyagawa (University of Manchester, UK), S. Marti i Garcia (IFIC-Valecnia, UV-CSIC, Spain), J. Schieck (MPI Muenchen, Germany) Software representation of the ATLAS magnetic field The ATLAS solenoid produces a magnetic field which enables the Inner Detector to measure track momentum by track curvature. This solenoidal magnetic field was measured using a rotating-arm mapping machine and, after removing mapping machine effects, has been understood to the 0.05% level. As tracking algorithms require the field strength at many different points, the representation of this magnetic field in Athena (the ATLAS offline software framework) can have a significant impact on the processing time for these algorithms. We review the field models and mathematical techniques used to decouple machine effects from real field features and evaluate the performance of different field representations within Athena. Detectors and Data Handling oral presentation & on behalf of the ATLAS collaboration "Salvador.Marti@ific.uv.es,schieck@mppmu.mpg.de"
129 KLOE Collaboration Preliminary measurement of BR(ke2)/BR(kmu2) at KLOE The measurement of the ratio of Ke2 and Kmu2 branching fractions is extremely well known within the Standard Model, in which muon-electron universality holds. In SUSY extensions the presence of Lepton Flavour Violating sources can produce non-universal terms. Therefore the measurement of the ratio BR(ke2)/BR(kmu2) is very important in probing mu-e universality and the presence of physics beyond the SM. We present a preliminary measurement of the ratio of the purely leptonic branching ratios of the charged kaons, BR(ke2)/BR(kmu2), using a sample of about 2 fb-1 of data acquired with the KLOE detector at the Frascati Phi-factory DAFNE. Flavour Physics and CP Violation giorgio.capon@lnf.infn.it
130 S. Marti i Garcia, S. Gonzalez-Sevilla (IFIC-Valencia, UV-CSIC, Spain), J. Schieck, T. Goetffert (MPI Muenchen, Germany) Track based alignment of the ATLAS inner detector It is foreseen that the Large Hadron Collider will start its operations and collide proton beams during November 2007. ATLAS is one of the four LHC experiments currently under preparation. The alignment of the ATLAS tracking system is one of the challenges that the experiment must solve in order to achieve its physics goals. The tracking system comprises two silicon technologies: pixel and microstrip plus a transition radiation detector. The alignment of the system requires a determination of more than 36000 degrees of freedom. The precision required for the most sensitive coordinate of the devices is of the order of few microns. This precision should be attained with a track based alignment and from the application of complex alignment algorithms. They require an extensive CPU and memory usage as large matrix inversion and many iterations algorithms are used. The alignment algorithms have been already exercised on several challenges as for instance real data ones: Combined Test Beam plus Cosmic Ray runs (at the surface and in the pit) as well with large scale computing simulation of physics samples. This note reports on the methods, their computing requirements and its preliminary results. Detectors and Data Handling oral presentation & on behalf of the ATLAS collaboration "Salvador.Marti@ific.uv.es,schieck@mppmu.mpg.de"
131 C. Schmitt on behalf of the ATLAS Inner Detector Offline Commissioning group Commissioning of the ATLAS Inner Detector with cosmic rays The inner detector of the ATLAS experiment is in the process of being commissioned using cosmic ray events. First tests were performed in the SR1 assembly hall at CERN with both barrel and endcaps for all different detector technologies (pixels and microstrips silicon detectors as well as straw tubes with additional transition radiation detection). Integration with the rest of the ATLAS sub-detectors is now being done in the ATLAS cavern. The full software chain has been set up in order to reconstruct and analyse this kind of events. Final detector decoders have been developed, different pattern recognition algorithms and track fitters have been validated as well as the various alignment and calibration methods. The infrastructure to deal with conditions data coming from the data acquisition, detector control system and calibration runs has been put in place, allowing also to apply alignment and calibration constants. The software has also been essential to monitor the detector performance during data taking. Detector efficiencies, noise occupancies and resolutions have been studied in detail and compared with those obtained from simulation. Detectors and Data Handling Christian.Schmitt@cern.ch
132 Sofia Vallecorsa on behalf of the CDF collaboration Measurement of the b-bbar jet cross section at CDF We present a $b \bar b$ jet cross section measurement based on about 260 $pb^{-1}$ of data, collected by CDF Run II until September 2004. The analysis strongly relies on the CDF detector good tracking capabilities both at trigger level, as data is selected requiring two displaced tracks at Level 2, and offline, since b-tagging is performed reconstructing secondary vertices inside the jet. The differential cross section is measured in the central region of the detector, focusing in particular on the study of the $b \bar b$ $\Delta \phi$ correlation, which gives information on the relative contribution of different production meachanisms. Results are corrected to the hadron level and compared to Leading Order (Pythia and Herwig) and Next-to-Leading Order (MC@NLO) Montecarlo. Strong Interactions sofia.vallecorsa@cern.ch
133 W. Vandelli on behalf of the DREAM Collaboration Cherenkov Light Contribution in Lead Tungstate Crystals Results of detailed measurements of the Cherenkov light yield from lead tungstate (PbWO4) crystals are presented. A single crystal as well as a small homogeneous calorimeter (ECAL), consisting of 19 PbWO4 crystals, were exposed to electrons, muons and pions in the H4 beam at CERN. It turns out that a significant fraction of the detected light is not the result of scintillation processes, but rather of the Cherenkov mechanism. This can be assessed from the analysis of both the angular dependence of the signals and their time structure. Detailed studies of the ECAL signals, corroborated by the measurements taken with the Dual-Readout Calorimeter (DREAM) backing up the ECAL during beam tests, show that is possible to estimate the independent contributions of scintillation and Cherenkov light. This information makes it possible to account for one of the dominant sources of fluctuations in hadronic showers and thus to achieve a significant improvement in hadronic calorimetry performance. Detectors and Data Handling wainer.vandelli@cern.ch
134 KLOE Collaboration New Measurements of the e+e- -> pi+pi-gamma Cross Section and The KLOE experiment at the phi factory DAPHNE is using ISR to measure sigma(e+e- -> pi+pi-gamma) and sigma(e+e- -> mu+mu-gamma), with an absolute normalisation obtained from Bhabha scattering. The pi+pi-gamma events are obtained with two different selection criteria: (a) requiring the photon emission at small angles (SA) (b) detecting the photon at large angles in the calorimeter (LA). With the two samples we cover the complete range of 2m_pi < sqrt{s'} = M_{pipi} < m_phi. Using a theoretical radiator function H(s) we extract the pion form factor |F_pi|^2 and obtain the two-pion contribution to a_mu^{had}. An alternative way to obtain |F_pi|^2 is via the ratio of sigma(e+e- -> pi+pi-gamma) over sigma(e+e- ->mu+mu-gamma). Results to be presented come from the analysis of 240 pb^{-1} collected in 2002, with very small statistical error (~0.1%) and improved systematic uncertainties (~1\%). Furthermore, using a run of 200 pb^{-1} of data taken at sqrt{s}=1 GeV, we can minimize the backgrounds due to resonant processes. High-Energy Electroweak Physics giorgio.capon@lnf.infn.it
135 Michel Sorel for the MiniBooNE collaboration MiniBooNE, part 2: First results of the muon-to-electron neutrino oscillation search The "blind" oscillation analysis performed, where all analysis selections and fitting procedures are determined before candidate electron neutrino events are examined, is described. First MiniBooNE neutrino oscillation results of electron neutrino appearance in a muon neutrino beam from this analysis are presented, and implications of the results are discussed. Finally, an outlook of MiniBooNE's next steps in light of these results is given. Neutrino Physics This talk and that of Byron Roe are companion talks on MiniBooNE. We request this talk be immediately preceded by Roe's talk on the MiniBooNE experiment and data analysis. sorel@fnal.gov
136 tara ohmdeiy atomic energy elements &property NUCLEAR ENERGY(PROPERTY OF ELEMENT,REACTION) Keywords :atoms ,reaction ,action ,energy , radio active. E-mail: tara_ahmadi_smart@yahoo.com structure of atoms& nuclear forces nucleus are proton & neutron mp=1/6729*10ª kj A=-27 proton has e=1/60*10ª C A=-19 &it quantum number =½ the mass of neutron are more than proton Mn=1/6750*10ª A=-27 nuclear forces 1.nuclear forces attractive atoms & is more than electrostatic or gravity. 2.nuclear force is between short distances & if this distance will more than normal state will zero fast. 3.nuclear force is between two nucleon(this force is between two state : neutron & proton, two neutron& proton ). we can find this force by equation according to electrostatic force, distance between two particle is rather 2Ŗ=2/4×10ª n A=-15 so this is F=kq²/r²=(9×10³•³Nm²/c²)(1/6×10¹º´³•³)²÷(2/4×10­¹º´³´²m)²=40N (´=+) potential energy of proton is the function distance until center of atom r>R , potential energy from colon's repulsive between proton& nucleus with Ze internal energy. if the potential energy will less fast mean the nuclear force not available. this force must between short & constant distances means this is microscopy , if the particle come near the nucleus ;this nucleus will like + particle & we can decide this action according to Electromagnetic force. once usage a bout this action is full of nuclear energy , this is a reason for build a normal state & say why nucleon binding energy in normal mass till heavy mass nuclear are without number of nucleus. this reason of full energy is each nucleus by nuclear energy only can action with nearest particles ( in it we have 30 nearest particles). Conservation energy Binding energy when atoms emitted , it need more energy because is between them violent nuclear energy & when build a nucleus , we have many free energy , this energy is Binding energy. According to special relativity ; we can say even time nuclear energy will less than when are behind an other . general nuclear mass must will less the add of protons & neutrons that mean A Z Mn is nuclear mass with atomic number A=Z+N, so Mnc² High-Energy Nuclear Physics no tara_ahmadi_smart@yahoo.com
137 G.Bozzi, B.Jager, C.Oleari, D.Zeppenfeld Next-to-leading order QCD corrections to W+ Z and W- Z production via vector-boson fusion. We present the calculation of the next-to-leading order QCD corrections to electroweak p p -> e+ nu_e mu+ mu- jj and p p -> e- nubar_e mu+ mu- jj production at the CERN LHC in the form of a fully flexible parton-level Monte Carlo program. The QCD corrections to the total cross sections are modest, changing the leading-order results by less than 10%. At the Born level, the shape of kinematic distributions can depend significantly on the choice of factorization scale. This theoretical uncertainty is strongly reduced by the inclusion of the next-to-leading order QCD corrections. Strong Interactions "This is the last of three papers devoted to NLO QCD corrections to vector boson pair production via vector boson fusion. I will present results from the other two papers as well. hep-ph/0603177, hep-ph/0604200, hep-ph/0701105. hep-ph/0701105" giuseppe@particle.uni-karlsruhe.de
138 G.Bozzi, B.Fuks, M.Klasen Threshold Resummation for Slepton-Pair Production at Hadron Colliders. We present a first and extensive study of threshold resummation effects for supersymmetric (SUSY) particle production at hadron colliders, focusing on Drell-Yan like slepton-pair and slepton-sneutrino associated production. After confirming the known next-to-leading order (NLO) QCD corrections and generalizing the NLO SUSY-QCD corrections to the case of mixing squarks in the virtual loop contributions, we employ the usual Mellin N-space resummation formalism with the minimal prescription for the inverse Mellin-transform and improve it by resumming 1/N-suppressed and a class of N-independent universal contributions. Numerically, our results increase the theoretical cross sections by 5 to 15% with respect to the NLO predictions and stabilize them by reducing the scale dependence from up to 20% at NLO to less than 10% with threshold resummation. Physics Beyond the Standard Model I will present results from this paper (hep-ph/0701202) as well as from a preceding one about qt-resummation (hep-ph/0603074) and a new one about joint resummation which is about to be finsihed. The three papers deal with slepton pair and slepton-sneutrino associated production at hadron colliders. giuseppe@particle.uni-karlsruhe.de
139 Matthew Wing (UCL) on behalf of Cambridge, Imperial, Manchester, RHUL, UCL Data acquisition systems for future calorimetry at the ILC A data acquisition system is described which will be used for the next generation of prototype calorimeters for the International Linear Collider and could also be used for the final system. The design is sufficiently generic such that it should have applications elsewhere, be they other ILC detectors or within High Energy Physics in general: e.g. this could be applied to LHC upgrade apparatus. The concept of moving towards a "backplaneless" readout is pursued. A strong under-pinning thread here is to attempt to make use of commercial components and identify any problems with this approach. Therefore the system should be easily upgradable, both in terms of ease of acquiring new components and competitive prices. The conceptual design, both hardware and software, of the data acquisition system for the ILC calorimeter will be discussed. Results and tests already done will then be shown indicating both the potential and limitations of the approach. Detectors and Data Handling mw@hep.ucl.ac.uk
140 Byron Roe for the MiniBooNE collaboration The MiniBooNE experiment, part 1: Experiment and Data Analysis The MiniBooNE experiment and the data analysis are described. Topics include experimental setup, apparatus response, calculation of neutrino and event flux, event reconstruction, particle identification algorithms, systematic errors, and charged current quasi-elastic cross sections. Neutrino Physics This talk and that of Michel Sorel are companion talks on MiniBooNE. We request this talk be first followed by Michel's talk on MiniBooNE results. byronroe@umich.edu
141 Guskov Alexey Pion polarisability measurement at COMPASS. The electromagnetic structure of pions is probed in ${\pi}^{-}+(A,Z)\to {\pi}^{-}+(A,Z)+\gamma$ Compton scattering in inverse kinematics (Primakoff reaction) and described by the electric (${\alpha}_{\pi}$) and the magnetic (${\beta}_{\pi}$) polarizabilities, that depend on the rigidity of pion's internal structure as a composite particle. Values for pion polarizabilities can be extracted from the comparison of the differential cross section for scattering of pointlike pions with the measured cross section. The pion polarizability measurement was performed with a ${\pi}^{-}$ beam of 190~GeV . The high beam intensity, the good spectrometer resolution, the high rate capability, the high acceptance and the possibility to use pion and muon beams, that are unique to the COMPASS experiment provide the tools to measure precisely the pion polarizabilities in the Primakoff reaction. The precise tracking system, electromagnetic and hadron calorimeters provide neccessary conditions for Primakoff events selection and background suppression. Most of the statistics was collected with a lead target, along with smaller samples using carbon and copper. The COMPASS result is compared to predictions from various models: $chiPT$,dispersion sum rules, QCD sum rule, lattice calculations. Strong Interactions guskov@mail.cern.ch
142 Guskov A. on behalf of COMPASS collaboration Pion polarisability measurement at COMPASS. The electromagnetic structure of pions is probed in ${\pi}^{-}+(A,Z)\to {\pi}^{-}+(A,Z)+\gamma$ Compton scattering in inverse kinematics (Primakoff reaction) and described by the electric (${\alpha}_{\pi}$) and the magnetic (${\beta}_{\pi}$) polarizabilities, that depend on the rigidity of pion's internal structure as a composite particle. Values for pion polarizabilities can be extracted from the comparison of the differential cross section for scattering of pointlike pions with the measured cross section. The pion polarizability measurement was performed with a ${\pi}^{-}$ beam of 190~GeV . The high beam intensity, the good spectrometer resolution, the high rate capability, the high acceptance and the possibility to use pion and muon beams, that are unique to the COMPASS experiment provide the tools to measure precisely the pion polarizabilities in the Primakoff reaction. The precise tracking system, electromagnetic and hadron calorimeters provide neccessary conditions for Primakoff events selection and background suppression. Most of the statistics was collected with a lead target, along with smaller samples using carbon and copper. The COMPASS result is compared to predictions from various models: $chiPT$,dispersion sum rules, QCD sum rule, lattice calculations. Strong Interactions guskov@mail.cern.ch
143 KLOE Collaboration Measurement of the eta mass at Kloe The KLOE collaboration has performed a measurement of the eta mass using the decay phi => eta gamma, eta => gamma gamma. The two most precise measurements available from the NA48 collaboration and GEM collaboration shows a discrepancy of about 8 sigma one from each other, indicating the need of a further measurement in order to clarify the situation. In this presentation we will show the new measurement obtained by using kinematic constraints on the 3 photons event and the careful evaluation of all the systematics that can affect the measurement. The comparison with the previous measurements will be shown. Strong Interactions 2nd suggested session: Flavour Physics and CP Violation giorgio.capon@lnf.infn.it
144 KLOE Collaboration Study of the phi=>eta pi0 gamma decay at Kloe The KLOE experiment has collected 2.5 fb-1 at the peak of the phi resonance, at the e+e- collider DAphNE in Frascati. The data collected in the 2001-2002 running period, corresponding to about 450 pb-1, have been used to investigate the properties of the light scalar meson a0(980), whose structure is still controversial (q qbar, 4 quark state, or K Kbar molecule). The a0 meson has been observed through the decay chains phi(1020)=> a0 gamma, a0=>eta pi0 with eta=>gammagamma and eta=>pi+pi-pi0. The Br() has been measured, and the etapi0 invariant mass spectra have been fitted with two different theoretical approaches, to obtain the relevant parameters of the resonance, the mass and the couplings g_phia0gamma, g_a0etapi0 and g_a0KKbar. The results are compared to the SU(3) expectations for the possible structures of the meson. Strong Interactions giorgio.capon@lnf.infn.it
145 KLOE Collaboration Search for the phi=> f0/a0 gamma=> KS KS gamma decay at Kloe One possible decay mode for the f0(980),a0(980) scalar mesons is into K0 K0bar. At Kloe f0 or a0 are produced via the radiative decay phi=> f0/a0 + gamma with the resulting K0barK0 mesons produced in a symmetric state JPC=0++. No previous measurement of this decay mode exists. The expected branching ratio for this channel with Kaon Loop models is of order 10-8. KLOE looks for KS KS gamma final state events, with both KS decaying in pi+pi-. Results are presented with the full KLOE statistics. Strong Interactions 2nd suggested session: Flavour Physics and CP Violation giorgio.capon@lnf.infn.it
146 KLOE Collaboration Determination of the BR ratio R_phi=BR(phi => eta_prime gamma)/BR(phi => eta gamma) at Kloe We present the most accurate determination to date of the ratio R_phi=BR(phi => eta_prime gamma)/BR(phi => eta gamma). The result has been obtained by studying the radiative decays phi => eta_prime gamma and phi => eta gamma in the final states pi+pi- 7 gamma's and 7 gamma's respectively, in a sample of about 10+9 phi mesons produced at the Frascati phi-factory. We obtain R_phi=(4.77 +- 0.09 stat +- 0.19 syst) 10-3 from which we derive BR(phi => eta_prime gamma)=(6.20 +- 0.11 stat +- 0.25 syst) 10-5. In the hypothesis of no gluonium content we extract the pseudoscalar mixing angle in the quark-flavor basis phi_P=(41.4 +- 0.3 stat +- 0.7 syst +- 0.6 th)\circ. Combining the value of R_phi with other constraints, we estimate the gluonium fractional content of eta_prime meson as Z2 = 0.14 +- 0.04 and the mixing angle phi_P = 39.7 +- 0.7 degrees. Strong Interactions giorgio.capon@lnf.infn.it
147 KLOE Collaboration Study of the eta => 3pi decay Dalitz plot at Kloe We have studied the process eta=> 3 pi at the Frascati phi factory, by looking at nearly 17 millions decays of eta mesons produced via the radiative process phi=>eta gammma. The dynamics of the decay has been studied using the Dalitz plot technique, obtaining the most accurate determination to date of the parameters of the Dalitz plot expansion in the pi+pi-pi0 final state and a new determination of the eta=> 3pi0 quadratic slope. Results can be compared to chiral perturbation theory predictions in order to extract information on light quark mass ratios. Flavour Physics and CP Violation 2nd suggested session: Strong Interactions giorgio.capon@lnf.infn.it
148 KLOE Collaboration Study of the two pions decay of the f0(980) at Kloe The KLOE experiment has collected 2.5 fb-1 of e+e- collisions at center of mass energy around the phi mass. Phi radiative decays are used to produce large statistical samples of light scalar mesons. The search for the f0(980) in dipion final states, with the 450 pb-1 acquired in 2001/2002, has been completed. The f0(980)-->pi+pi- is searched for as a deviation from the expected ISR+FSR contributions in pi+pi-gamma events with photons at large angle; a clear scalar signal is observed in the pi+pi- invariant mass and in the charge asymmetry distributions. The reaction e+e- --> pi0pi0gamma has been studied by performing a Dalitz plot analysis of around 145 pb-1 with beam energies between 1019.7 and 1019.8 MeV. The high statistical sample of around 130,000 events is described by the not resonant rho --> omega pi0 mediated production and the phi --> f0(980) gamma decay mechanism. These data samples are used to investigate the properties of f0(980) by studying their invariant mass shapes or the event density in the Dalitz plot, thus shading light on the controversial structure of these particles. A possible contribution due to sigma(600) is also exploited. In order to discriminate between models, data have been fit with different theoretical approaches. For each of them we extract the f0(980) mass and its coupling to KK, pipi and to the phi meson. The Kaon Loop model gives a stable framework to describe both final states. A high coupling of the f0(980) to kaons and to the phi is found, enforcing the interpretation of its nature as a 4-quark state. Strong Interactions giorgio.capon@lnf.infn.it
149 Jean-Marc Le Goff on behalf of the COMPASS collaboration Measurement of gluon polarization at COMPASS One of the main aim of the COMPASS collaboration at Cern is the measurement of the gluon polarization inside the nucleon. This is done through the measurement of the double spin asymmetry of the photon-gluon-fusion process in the scattering of 160 GeV polarized muons on polarized deuterons. This process is tagged either by open charm production or by the production of a pair of high pt hadrons. The first method is very clean but it suffers from limited statistical accuracy, Delta G/G (x=0.15)= 0.57 +- 0.41(stat) +- 0.17(syst). The second method provides good statistical accuracy and, using events at low Q2, it provides a result : Delta G/G (x=0.09)= 0.016 +- 0.058(stat) +- 0.055(syst). This result disfavors large values of the gluon spin contribution to the nucleon spin, Delta G, which is the integral of Delta G(x). Strong Interactions jmlegoff@cea.fr
150 B.El-Bennich, A.Furman, R.Kaminski, L.Lesniak, B.Loiseau CP violation and final state interactions in B --> K pi pi decays We study CP violation and final state interactions between pairs of pseudoscalar mesons in three body B+, B-, B0 and antiB0 decays into K pi pi system. The weak transition amplitudes consist of two terms: the first part obtained in QCD factorization and the second being a long - distance charming penguin contribution. In the S- wave, the rescattering or the transition amplitudes between two pions are described by a unitary coupled channel model in which all the scalar- isoscalar resonances appear as poles of the meson-meson amplitudes. Interesting interference effects between the f0(980) and rho(770) resonances are found. A good global fit to the available BaBar and Belle data is performed using four complex charming penguin parameters in the S- and P- waves. The data consist of 204 data points describing the pi+ pi- effective mass and angular distributions and 18 observables which include branching fractions, direct CP- violating asymmetries for the charged B decays as well as time- dependent CP asymmetries. The observed large direct CP- asymmetry for B+- --> rho(770) K+- decays is well reproduced [1]. Extentions of the above approach to include interactions between pions and kaons in the final states are being currently considered. Reference: [1] B. El-Bennich, A. Furman, R. Kaminski, L. Lesniak and B. Loiseau, Interference between f0(980) and rho(770) resonances in B --> pi+ pi- K decays, Phys. Rev. D 74 (2006) 114009. Flavour Physics and CP Violation Leonard.Lesniak@ifj.edu.pl
151 NA48 Collaboration Recent results from NA48/2 on Ke4 decays and interpretation in term of pi-pi scattering lengths The NA48/2 experiment at the CERN SPS has collected about 10**6 K± decays into pi+ pi- e± ν (Ke4) in 2003 and 2004. The analysis of a partial sample of ~500000 such events allows a precise measurement of the decay parameters. The form factors of the reaction and their dependence with dipion and dilepton masses have been measured. Thanks to a sizeable acceptance at large Mpipi and the very good resolution of the NA48 detector, a high sensitivity to the pi-pi scattering lengths a00 and a02 is achieved. These almost model independent measurements can be confronted with the predictions from different calculations, in particular within the framework of Chiral Perturbation Theory. Strong Interactions cristina.lazzeroni@cern.ch
152 CALICE Collaboration First CALICE Analogue HCAL results from CERN test beam data A prototype hadronic calorimeter for an ILC detector was installed and tested during summer 2006 at the CERN SPS facilities. The detector, consisting of about 500 scintillator tiles, read out via Silicon photomultipliers, was commissioned and calibrated. Data were collected with electron and hadron beams in the energy range 6 to 80 GeV. A first part of the analysis foxuses on the electromagnetic shower reconstruction. Though somewhat simpler than hadronic shower reconstruction, this analysis is crucial to demonstrate the quality of the calibration and detector understanding through comparison with Monte Carlo simulations. This contribution focuses on the commisioning of the Analogue HCAL detector, the calibration procedure and performance, and on the first results of the electromagnetic shower analysis. Detectors and Data Handling drw1@cam.ac.uk
153 NA48 collaboration NA48/2 Final results on charged semileptonic kaon decays and Vus Measured ratios of decay rates for ${\cal R}_{K e 3/K2\pi}$, ${\cal R}_{K \mu 3/ K2\pi}$ and ${\cal R}_{K \mu 3 / Ke3}$ are presented. These measurements are based on $K^\pm$ decays collected in a dedicated run in 2003 by the NA48/2 experiment at CERN. The results obtained are ${\cal R}_{K e 3 / K2\pi}=0.2496\pm0.0009 (stat)\pm 0.0004 (syst)$ and ${\cal R}_{K \mu 3 /K2\pi} = 0.1637\pm 0.0006 (stat)\pm 0.0003(syst)$. Using the PDG average for the $K^\pm \rightarrow\pi^\pm \pi^0$ normalisation mode, both values are found to be larger than the current values given by the Particle Data Book and lead to a larger magnitude of the $|V_{us}|$ CKM element than previously accepted. When combined with the latest Particle Data Book value of $|V_{ud}|$, the result is in agreement with unitarity of the CKM matrix. In addition, a new measured value of ${\cal R}_{K \mu 3 / K2\pi} = 0.656\pm 0.003(stat)\pm 0.001(syst)$ is compared to the semi-empirical predictions based on the latest form factor measurements. High-Energy Electroweak Physics cristina.lazzeroni@cern.ch
154 NA48 collaboration Testing the lepton universality with K->l nu decays The ratio $R_K = \Gamma(K^{\pm}\to e^{\pm}\nu) / \Gamma(K^{\pm}\to \mu^{\pm}\nu) $ provides a very powerful probe for the weak interactions structure. This ratio of decay rates is calculated with very high precision within the Standard Model but corrections due to the presence of New Physics could be as high as 3\%. The data obtained by the NA48 experiment in two years of data taking at the CERN SPS accelerator has been analyzed. The obtained result for $R_K$ is two times more precise than the world average but is still insufficient to probe the existence of physics Beyond the Standard Model. A new run in 2007, aimed for a sub-percent precision measurement of $R_K$, has been proposed and approved. Physics Beyond the Standard Model cristina.lazzeroni@cern.ch
155 NA48 collaboration Testing the lepton universality with K->l nu decays The ratio $R_K = \Gamma(K^{\pm}\to e^{\pm}\nu) / \Gamma(K^{\pm}\to \mu^{\pm}\nu) $ provides a very powerful probe for the weak interactions structure. This ratio of decay rates is calculated with very high precision within the Standard Model but corrections due to the presence of New Physics could be as high as 3\%. The data obtained by the NA48 experiment in two years of data taking at the CERN SPS accelerator has been analyzed. The obtained result for $R_K$ is two times more precise than the world average but is still insufficient to probe the existence of physics Beyond the Standard Model. A new run in 2007, aimed for a sub-percent precision measurement of $R_K$, has been proposed and approved. Physics Beyond the Standard Model cristina.lazzeroni@cern.ch
156 CALICE Collaboration First CALICE SiW ECAL results from CERN and DESY test beams A prototype Silicon-Tungsten electromagnetic calorimeter for an ILC detector was installed and tested during summer 2006 at DESY, and subsequently at the CERN SPS test beam. The detector, consisted of about 6480 1x1 cm^2 silicon pads. Data were collected with electron and hadron beams in the energy range 1 to 50 GeV. The analysis described focuses on the electromagnetic shower reconstruction. This analysis is crucial to demonstrate the quality of the calibration and detector understanding through comparison with Monte Carlo simulations. In subsequent analysis, the data will be combined with those recorded with the Calice analogue HCAL in order to study hadronic showers with high spatial precision. Detectors and Data Handling David Ward
157 The H1 and ZEUS Collaborations Combined results on charged current and neutral current in deep inelastic scattering cross sections at HERA Measurements of the neutral current and charged current deep inelastic scattering cross sections at very high Q2 are performed by the H1 and ZEUS Collaborations. The results from the full HERAI+II running period 1994-2007 of the two experiments are combined, corresponding to an integrated luminosity of approximately 1 fb-1. The neutral current data provide measurements of the interference structure function xF_3^{gammaZ}, which is sensitive to the valence quark distributions at values of the Bjorken value x as low as few 10^{-2}. The polarized charged current results are used to set limits on right-handed charged current interactions. The polarized cross section asymmetries in neutral current are used to demonstrate parity violating effects in electroweak interactions. Finally, from the dependence of the neutral current cross section on Q2, a combined limit on the quark charge radius is extracted. Strong Interactions also submitted to the Electroweak and beyond the Standard Model session gallo@mail.desy.de
158 The H1 and ZEUS Collaborations Combined results on charged current and neutral current in deep inelastic scattering cross sections at HERA Measurements of the neutral current and charged current deep inelastic scattering cross sections at very high Q2 are performed by the H1 and ZEUS Collaborations. The results from the full HERAI+II running period 1994-2007 of the two experiments are combined, corresponding to an integrated luminosity of approximately 1 fb-1. The neutral current data provide measurements of the interference structure function xF_3^{gammaZ}, which is sensitive to the valence quark distributions at values of the Bjorken value x as low as few 10^{-2}. The polarized charged current results are used to set limits on right-handed charged current interactions. The polarized cross section asymmetries in neutral current are used to demonstrate parity violating effects in electroweak interactions. Finally, from the dependence of the neutral current cross section on Q2, a combined limit on the quark charge radius is extracted. High-Energy Electroweak Physics also submitted to the Strong Interactions and beyond the Standard Model session gallo@mail.desy.de
159 NA48 collaboration Measurement of the CP violation parameter $|\eta_{+-}|$ and the charge asymmetry in $K^\pm \to 3\pi$ decays by NA48 and NA48/2 The main goal of the NA48 experiment at the CERN SPS has been the search for direct CP violation (CPV) in kaon decays. The observable $\eta_{+-}$ is related to the parameters of indirect and direct CPV ($\eta_{+-} = \varepsilon + \varepsilon^\prime$) and defined as the CP violating amplitude ratio of the neutral kaon decaying into two charged pions: $\eta_{+-} = A(K_L \to \pi^+\pi^-)/A(K_S \to \pi^+\pi^-)$. NA48 has determined $|\eta_{+-}|$ via the measurement of the ratio of decay rates $\Gamma(K_L \to \pi^+\pi^-)/\Gamma(K_L \to \pi e \nu)$. The data were taken during a dedicated run in 1999 using a pure $K_L$ beam. The analysis is based on 47000 $K_L \to \pi^+\pi^-$ and five million $K_L \to \pi e \nu$ decays. Complementary with $\varepsilon^\prime/\varepsilon$, the observable in the charged kaons sector is the asymmetry $A_g = (g^+ - g^-)/(g^+ + g^-)$ of the linear slope parameter $g$ in the Dalitz plot of $K^\pm \to 3\pi$ decays. Any non-zero value of $A_g$ would reflect evidence for direct CPV. SM predictions for the charge asymmetry give an upper limit of a few $10^{-5}$, while theoretical calculations involving processes beyond the SM do not exclude substantial enhancements of $A_g$. The NA48/2 experiment used simultaneous $K^+/K^-$ beams, and from the data samples taken in 2003 and 2004, $3.11 \times 10^9 K^\pm \to \pi^\pm\pi^+\pi^-$ and $9.13 \times 10^7 K^\pm \to \pi^\pm\pi^0\pi^0$ were selected. The charge asymmetry parameter $A_g$ was determined with a total uncertainty of $\sim 2\times 10^{-4}$ for each mode, ten times more accurate than previous measurements. Flavour Physics and CP Violation cristina.lazzeroni@cern.ch
160 The H1 and ZEUS Collaborations Combined results on charged current and neutral current in deep inelastic scattering cross sections at HERA Measurements of the neutral current and charged current deep inelastic scattering cross sections at very high Q2 are performed by the H1 and ZEUS Collaborations. The results from the full HERAI+II running period 1994-2007 of the two experiments are combined, corresponding to an integrated luminosity of approximately 1 fb-1. The neutral current data provide measurements of the interference structure function xF_3^{gammaZ}, which is sensitive to the valence quark distributions at values of the Bjorken value x as low as few 10^{-2}. The polarized charged current results are used to set limits on right-handed charged current interactions. The polarized cross section asymmetries in neutral current are used to demonstrate parity violating effects in electroweak interactions. Finally, from the dependence of the neutral current cross section on Q2, a combined limit on the quark charge radius is extracted. Physics Beyond the Standard Model also submitted to the Strong Interactions and the Electroweak sessions gallo@mail.desy.de
161 NA48 collaboration Precision study of $K^\pm\to\pi^\pm\pi^0\pi^0$ and $K^\pm\to\pi^\pm\pi^+\pi^-$ Dalitz plot distibutions by NA48/2 The NA48/2 experiment at the CERN SPS has collected an unprecedented sample of 3-pion decays of charged kaons. The high statistics and the good resolution of the detectors allow a unique investigation of the detailed phase space distributions of these decays. The effects of final state pion rescattering observed in the Dalitz plot distribution of the $K^\pm\to\pi^\pm\pi^0\pi^0$ decays turned out to be a powerful tool for extraction of the S-wave pion-pion scattering lengths. The recent results obtained using a number of different theoretical approaches will be discussed, together with future prospects. The large statistics also allowed a precise measurement of the Dalitz plot slope parameters for the $K^\pm\to\pi^\pm\pi^+\pi^-$ decays, which will be discussed. Strong Interactions cristina.lazzeroni
162 NA48 collaboration New precise measurements of radiative charged kaon decays The NA48/2-Experiment at the CERN SPS has recorded more than 2 billion charged kaon decays. From a sub-sample of this data set we have selected about 2 x 10^5 practically background free events of the decay K+- -> pi+- pi0 gamma, which is an order of magnitude more than from any previous experiment. The decay K+- -> pi+- pi0 gamma is dominated by Inner Bremsstrahlung (IB) of the K+- -> pi+- pi0 decay, but also exhibits a contribution of Direct Emission (DE), which is of high theoretical interest, as well as the interference between both amplitudes. We present a precise measurement of both the DE amplitude and the interference between IB and DE. In addition, using the full data set, we have made the first observation of the very rare decay K+- -> pi+- gamma e+ e-, which has large contributions from higher order pion loops. We have measured the branching fraction and the form factor of this decay. High-Energy Electroweak Physics Might also be included in Flavour Physics cristina.lazzeroni@cern.ch
163 NA48 collaboration New precise results for Xi0 decays in NA48 We present new precise measurements of the lifetime of the neutral Xi0 hyperon and its radiative decays into the Lambda gamma and Sigma gamma final states. The data have been recorded with the NA48/1 experiment at the CERN SPS from a total flux of more than 2 billion Xi0 decays. From this data set we have improved significantly the knowledge on the Xi0 mean lifetime. In addition, we analyzed a data sample of about 50000 Xi0 -> Lambda gamma and 20000 Xi0 -> Sigma gamma decays, which exceeds present statistics by about one order of magnitude. We present new precise measurements of the decays asymmetries of these decays, which play an important role in understanding the decay mechanism of hyperon decays. High-Energy Electroweak Physics cristina.lazzeroni@cern.ch
164 NA48 collaboration Precision study of $K^\pm\to\pi^\pm\pi^0\pi^0$ and $K^\pm\to\pi^\pm\pi^+\pi^-$ Dalitz plot distibutions by NA48/2 The NA48/2 experiment at the CERN SPS has collected an unprecedented sample of 3-pion decays of charged kaons. The high statistics and the good resolution of the detectors allow a unique investigation of the detailed phase space distributions of these decays. The effects of final state pion rescattering observed in the Dalitz plot distribution of the $K^\pm\to\pi^\pm\pi^0\pi^0$ decays turned out to be a powerful tool for extraction of the S-wave pion-pion scattering lengths. The recent results obtained using a number of different theoretical approaches will be discussed, together with future prospects. The large statistics also allowed a precise measurement of the Dalitz plot slope parameters for the $K^\pm\to\pi^\pm\pi^+\pi^-$ decays, which will be discussed. Strong Interactions cristina.lazzeroni@cern.ch
165 NA48 collaboration The $K^+\rightarrow\pi^+\nu\bar{\nu}$ experiment at CERN The NA48/3-P326 proposal for an experiment to measure the branching ratio of the very rare kaon decay $K^+\rightarrow\pi^+\nu\bar{\nu}$ at the CERN SPS will be described. This will allow a 10% measurement of the CKM parameter |Vtd|. The proposed experiment aims to collect about 80 $K^+\rightarrow\pi^+\nu\bar{\nu}$ events with a 10\% of background in two years of data taking. The status of the project, the R\&D and the future perspectives for the experiment will be discussed. Flavour Physics and CP Violation might be also included in Electroweak session cristina.lazzeroni@cern.ch
166 D. Barberis, K. Bos, M. Branco, D. Cameron, L. Goossens, A. Nairz, G. Poulard, P. Salgado ATLAS Computing System Commissioning: real-time data processing and distribution tests The ATLAS experiment is commissioning its computing system in preparation for LHC data. Part of this activity consists in testing the data flow from the online data acquisition to the offline processing system, and the distribution of raw and processed data to the external computing centres. A series of functional and rate tests has been performed in 2006 and 2007, allowing the optimisation of the hardware and software components of this system; the last phase of commissioning, the so-called Final Dress Rehearsal, consisting of an integration tests of all components, will take place later in 2007. This talk will describe the performed tests, the problems that we encountered, and the solutions we found. Detectors and Data Handling Dario.Barberis@cern.ch
167 M. Ciuchini, E. Franco, G. Martinelli, M. Pierini, L. Silvestrini Dealing with hadronic uncertanties in charmless B decays: model independent approaches and charming penguins We discuss how, in spite of the presence of long distance contributions that invalidate perturbative calculations in hadronic charmless B decays, it is possible to extract interesting information from the available experimental data. We illustrate few cases i which penguin contribution can be taken into account in a model-independent way, allowing to predict the weak phases for channels which are differently sensitive to new physics. We also how long distance contributions, such as charming penguins model, can be obtained from data even when a model-independent approach is not possible and how the Standard Model can be tested within this approach. Flavour Physics and CP Violation maurizio.pierini@roma1.infn.it
168 M. Bona, M. Ciuchini, E. Franco, V. Lubicz, G. Martinelli, F. Parodi, M. Pierini, P. Roudeau, C. Schiavi, L. Silvestrini, V. Sordini, A. Stocchi, V. Vagnoni Status of the Unitarity Triangle analysis in the Standard Model We present the update of the Unitarity Triangle analysis in the Standard Model. Combining the direct measurements on sides and angles of the Unitarity Triangle, we determine the values of the CKM parameters rhobar and etabar. We discuss the agreement of the current measurements and the indirect determinations from the rest of the fit, as well as the prediction on rare B and K decays. This set of information provides the most poweful test of the Standard Model from flavour physics Flavour Physics and CP Violation UTfit Collaboration maurizio.pierini@roma1.infn.it
169 M. Bona, M. Ciuchini, E. Franco, V. Lubicz, G. Martinelli, F. Parodi, M. Pierini, P. Roudeau, C. Schiavi, L. Silvestrini, V. Sordini, A. Stocchi, V. Vagnoni The Unitarity Triangle analysis as a probe of New Physics Using the Unitarity Triangle analysis, generalized to account for the presence of physics behyond the Standard Model, we discuss the current model-independent bounds on New Physics contributions to K-Kbar, D-Dbar and Bq-Bq bar (q=d,s) mixing processes. This information is translated into a lower limit on the probed scale of New Physics. We consider several scenarios, such as New Physics with generic flavour structure, NMFV, as well as MFV with low, moderate or large values of tanbeta. Physics Beyond the Standard Model UTfit Collaboration maurizio.pierini@roma1.infn.it
170 M. Bona, M. Ciuchini, E. Franco, V. Lubicz, G. Martinelli, F. Parodi, M. Pierini, P. Roudeau, C. Schiavi, L. Silvestrini, V. Sordini, A. Stocchi, V. Vagnoni The Unitarity Triangle analysis confronts Lattice QCD The overconstrained determinations of the angles of the Unitarity Triangle allows to determine the CKM parameters rhobar and etabar without using inputs from lattice QCD. Using this information and the experimental measurements of K-Kbar and Bq-Bq bar (q=d,s) mixing processes, as well as BR(B ->tau nu), we obtain a data-driven determination of the lattice parameters f_Bs, xi, B_K and Bhat, which allows to test the predictions from non-perturbative calculations. using this strategy, it is possible to predict the value of Vub from the determination of the CKM matrix and compare it to the currently available inclusive and exclusive determinations. Flavour Physics and CP Violation UTfit Collaboration maurizio.pierini@roma1.infn.it
171 A. Donini, M. Maltoni, D. Meloni, P. Migliozzi and F. Terranova 3+1 sterile neutrinos at the CNGS We study the potential of the CNGS beam in constraining the parameter space of a model with three active plus one sterile neutrino such as to explain the LSND results in case of a positive result of MiniBooNE. We perform our analysis using the OPERA detector as a reference. We point out that the best channel to look for sterile neutrinos at the CNGS beam is $\nu_\mu \to \nu_\tau$, that is precisely the main signal for which OPERA has been built. We also analyse $\nu_\mu \to \nu_e$ oscillations. We take advantage of the expected efficiencies and backgrounds for these signals to make a realistic prediction of the potential of this experiment to look for sterile neutrinos. Combination of data from both channels permit to cover almost all of the allowed CP-conserving 3+1 neutrino model parameter space. Neutrino Physics meloni@roma1.infn.it
172 Jaime Alvarez-Muniz and Pedro Facal for the Pierre Auger Collaboration Inclined showers at the Pierre Auger Observatory The cosmic ray showers detected at the Pierre Auger Observatory and having zenith angles greater than 60 degrees are the subject of a dedicated analysis. The spectrum of cosmic ray events above 10^19 eV and zenith angles between 60 and 80 degrees is presented and its implications discussed. The potential of the surface detector of the Pierre Auger Observatory for detecting neutrinos through deeply penetrating inclined showers having a significant electromagnetic component is studied, and an upper limit to the diffuse neutrino flux at EeV energies is presented. Astroparticle Physics, Gravitational Waves and Cosmology jaime@fpaxp1.usc.es
173 H1 Collaboration D* Production in Deep-Inelastic Scattering with the H1 Detector Results on D* meson production in deep inelastic scattering at HERA are presented. The data were taken with the H1 detector in the years 2004 to 2006 and correspond to an integrated luminosity of 222 pb^-1. The analysis covers the kinematic region 5 < Q^2 < 100 GeV^2 and 0.051.5 GeV and |eta(D*)|<1.5 where more than 10,000 $D*$ mesons are reconstructed. Single and double differential inclusive cross sections of D* meson production are compared to LO predictions and a NLO calculation in the massive scheme. Strong Interactions obehnke@mail.desy.de
174 H1 Collaboration Study of the D* fragmentation function in deep-inelastic ep scattering at HERA The charm fragmentation function is studied using $D^{*\pm}$-meson production close to the kinematic threshold in deep-inelastic scattering as measured by the H1 detector at HERA. Two different methods are used for the definition of the observable fraction $\rm{z}$ of the energy of the $D^{*\pm}$-meson with respect to the charm quark. The energy of the charm quark is approximated either by the energy of the jet including the $D^{*\pm}$-meson or by the energy of a suitably defined hemisphere which includes the $D^{*\pm}$-meson. The parameters of non-perturbative fragmentation functions are extracted for two QCD models based on leading order matrix elements and DGLAP or CCFM evolution of partons together with string fragmentation and particle decays as well as for a next-to-leading order QCD calculation in the fixed flavor scheme. Strong Interactions obehnke@mail.desy.de
175 H1 Collaboration Measurement of F_2^ccbar and F_2^bbbar using the H1 Vertex Detector at HERA The inclusive charm and beauty cross sections are measured in ep collisions at HERA in the kinematic region Q^2 > 6 GeV^2 The inclusive charm and beauty cross sections are measured in ep collisions at HERA in the kinematic region Q^2 > 6 GeV^2 and 0.07 Strong Interactions obehnke@mail.desy.de
176 H1 Collaboration Measurement of Beauty Production in Deep-Inelastic Scattering at HERA Using Events with Muons and Jets A measurement of the beauty production cross section in ep collisions at a centre-of-mass energy of 319 GeV is presented. The data were collected with the H1 detector at the HERA collider in the years 2005-2007 where an integrated luminosity of approximately 276 pb^-1 were collected. Events are selected by requiring the presence of jets and muons in the final state. Both, the long lifetime and the large mass of b-flavoured hadrons are exploited to identify events containing beauty quarks. Differential cross sections are measured in deep inelastic scattering, where 2 < Q^2 < 100 GeV^2. The results are compared with perturbative QCD calculations to leading and next-to-leading order. Strong Interactions obehnke@mail.desy.de
177 H1 Collaboration Measurement of Beauty Photo-Production at HERA Using Events with Muons and Jets A measurement of the beauty production cross section in ep collisions at a centre-of-mass energy of 319 GeV is presented. The data were collected with the H1 detector at the HERA collider in the years 2006-2007. Events are selected by requiring the presence of jets and muons in the final state. Both, the long lifetime and the large mass of b-flavoured hadrons are exploited to identify events containing beauty quarks. Differential cross sections are measured in photo-production (Q^2<1 GeV^2). The results are compared with perturbative QCD calculations to leading and next-to-leading order. Strong Interactions obehnke@mail.desy.de
178 H1 Collaboration Measurement of Inelastic Electro-Production of J/Psi Mesons in ep Scattering at HERA Inelastic electro-production of J/Psi mesons is studied in $ep$-scattering at HERA. The data were taken with the H1 detector in the years 2004 through 2006 and correspond to an integrated luminosity of approximately 258 pb^-1. Single differential and double differential cross sections and angular distributions are measured with increased precision and purity compared to previous analyses. The results are compared to theoretical predictions. Strong Interactions obehnke@mail.desy.de
179 H1 Collaboration Beam charge azimuthal asymmetry and deeply virtual compton scattering at HERA II For the first time in a collider mode, an azimuthal cross section asymmetry with respect to the charge of the incoming lepton beam is reported from a study of exclusive electroproduction of real photons, $e^{+,-} p \rightarrow e^{+,-} \photon p$ recorded with the H1 detector at HERA, from the year 2003 till 2007. The analysed data sample corresponds to an integrated luminosity of 300 pb$^{-1}$, equally shared in $e^+$ and $e^-$ incident lepton charge. The observed asymmetry is attributed to the interference of the Bethe-Heitler and the deeply virtual compton scattering proceses. It is observed in the kinematic domain $6.5 < Q^2 < 80$~GeV$^2$ and $30 < W < 140$~GeV and provides a direct access to generalized parton distributions. Using the complete data sample, elastic deeply virtual compton scattering cross sections, $\gamma^* p \rightarrow \photon p$, are measured, differentially in the square of the invariant momentum transfer to the proton $t$, for different $Q^2$ and $W$ values. The exponential $t$-slope parameters are then derived for different values of $Q^2$ and $W$. Strong Interactions obehnke@mail.desy.de
180 H1 Collaboration Measurement and QCD interpretation of the diffractive cross section at medium $Q^2$ Measurements of the cross section for the diffractive process ep -> eXY are presented in the kinematic region $12 \leq Q^2 \leq 90$~GeV$^2$, $0.01 \leq \beta \leq 0.90$ and $\xpom<0.1$, with $M_{_Y} < 1.6 \ {\rm GeV}$ and $|t| < 1.0 \ {\rm GeV^2}$, for an integrated luminosity of 120~pb$^{-1}$. These data were recorded with the H1 detector during the years 1999, 2000 and 2005. The diffractive events are selected requiring a large rapidity interval between the hadronic systems $X$ and $Y$. We also present a determination of the cross sections using a method based on the different behaviour in $M_X$, the invariant mass of the hadronic system $X$, of the diffractive and standard inclusive contributions to the deep inelastic sample. Both approaches are compared in the kinematic range of the analysis, showing a good agreement. The diffractive structure function measurements are analysed with a model based on the Regge phenomenology and the $Q^2$ dependence of the Pomeron intercept is studied. Measurements are then compared to a dipole model which is found to give a very good description of the data over the whole kinematic range. Strong Interactions obehnke@mail.desy.de
181 H1 Collaboration Measurement and QCD Analysis of the Diffractive Deep-Inelastic Scattering Cross Section at HERA A detailed analysis is presented of the diffractive deep-inelastic scattering process $ep\rightarrow eXY$, where $Y$ is a proton or a low mass proton excitation carrying a fraction $1 - \xpom > 0.95$ of the incident proton longitudinal momentum and the squared four-momentum transfer at the proton vertex satisfies $|t|<1 \ {\rm GeV^2}$. Using data taken by the H1 experiment, the cross section is measured for photon virtualities in the range $3.5 \leq Q^2 \leq 1600 \rm\ GeV^2$, triple differentially in $\xpom$, $Q^2$ and $\beta = x / \xpom$, where $x$ is the Bjorken scaling variable. At low $\xpom$, the data are consistent with a factorisable $\xpom$ dependence, which can be described by the exchange of an effective pomeron trajectory with intercept $\alphapom(0)= 1.118 \pm 0.008 \ {\rm (exp.)} \ ^{+0.029}_{-0.010} \ {\rm (model)}$. Diffractive parton distribution functions and their uncertainties are determined from a next-to-leading order DGLAP QCD analysis of the $Q^2$ and $\beta$ dependences of the cross section. The resulting gluon distribution carries an integrated fraction of around $70 \%$ of the exchanged momentum in the $Q^2$ range studied. Total and differential cross sections are also measured for the diffractive charged current process $e^+ p \rightarrow \bar{\nu}_e XY$ and are found to be well described by predictions based on the diffractive parton distributions. The ratio of the diffractive to the inclusive neutral current $ep$ cross sections is studied. Over most of the kinematic range, this ratio shows no significant dependence on $Q^2$ at fixed $\xpom$ and $x$ or on $x$ at fixed $Q^2$ and $\beta$. Strong Interactions obehnke@mail.desy.de
182 H1 Collaboration Diffractive Deep-Inelastic Scattering with a Leading Proton at HERA The cross section for the diffractive deep-inelastic scattering process $ep \to e X p$ is measured, with the leading final state proton detected in the H1 Forward Proton Spectrometer. The data analysed cover the range \xpom <0.1 in fractional proton longitudinal momentum loss, 0.08 < |t| < 0.5 GeV^{-2} in squared four-momentum transfer at the proton vertex, 2 < Q^2 < 50 GeV^2 in photon virtuality and 0.004 < \beta = x / \xpom < 1, where x is the Bjorken scaling variable. For $\xpom \lapprox 10^{-2}$, the differential cross section has a dependence of approximately ${\rm d} \sigma / {\rm d} t \propto e^{6 t}$, independently of \xpom, \beta and Q^2 within uncertainties. The cross section is also measured triple differentially in \xpom, \beta and Q^2. The \xpom dependence is interpreted in terms of an effective pomeron trajectory with intercept $\alpha_{\pom}(0)=1.114 \pm 0.018 ({\rm stat.}) \pm 0.012 ({\rm syst.}) ^{+0.040}_{-0.020} ({\rm model})$ and a sub-leading exchange. The data are in good agreement with an H1 measurement for which the event selection is based on a large gap in the rapidity distribution of the final state hadrons, after accounting for proton dissociation contributions in the latter. Within uncertainties, the dependence of the cross section on x and Q^2 can thus be factorised from the dependences on all studied variables which characterise the proton vertex, for both the pomeron and the sub-leading exchange. Strong Interactions obehnke@mail.desy.de
183 H1 Collaboration Tests of QCD Factorisation in the Diffractive Production of Dijets in Deep-Inelastic Scattering and Photoproduction at HERA Measurements are presented of differential dijet cross sections in diffractive photoproduction (Q^2<0.01 GeV^2) and deep-inelastic scattering processes (DIS, 4 e X Y, in which the system X, containing at least two jets, is separated from a leading low-mass proton remnant system Y by a large rapidity gap. The dijet cross sections are compared with NLO QCD predictions based on diffractive parton densities previously obtained from a QCD analysis of inclusive diffractive DIS cross sections by H1. In DIS, the dijet data are well described, supporting the validity of QCD factorisation. The diffractive DIS dijet data are more sensitive to the diffractive gluon density at high fractional parton momentum than the measurements of inclusive diffractive DIS. In photoproduction, the predicted dijet cross section has to be multiplied by a factor of approximately 0.5 for both direct and resolved photon interactions to describe the measurements. The ratio of measured dijet cross section to NLO prediction in photoproduction is a factor 0.5+-0.1 smaller than the same ratio in DIS. This suppression is the first clear observation of QCD hard scattering factorisation breaking at HERA. The measurements are also compared to the two soft colour neutralisation models SCI and GAL. The SCI model describes diffractive dijet production in DIS but not in photoproduction. The GAL model fails in both kinematic regions. Strong Interactions obehnke@mail.desy.de
184 H1 Collaboration Diffractive Open Charm Production in Deep-Inelastic Scattering and Photoproduction at HERA Measurements are presented of diffractive open charm production at HERA. The event topology is given by ep -> eX Y where the system X contains at least one charmed hadron and is well separated by a large rapidity gap from a leading low-mass proton remnant system Y. Two analysis techniques are used for the cross section measurements. In the first, the charm quark is tagged by the reconstruction of a D*(2010) meson. This technique is used in deep-inelastic scattering (DIS) and photoproduction. In the second, a method based on the displacement of tracks from the primary vertex is used to measure the open charm contribution to the inclusive diffractive cross section in DIS. The measurements are compared with next-to-leading order QCD predictions based on diffractive parton density functions previously obtained from a QCD analysis of the inclusive diffractive cross section at H1. A good agreement is observed in the full kinematic regime, which supports the validity of QCD factorization for open charm production in diffractive DIS and photoproduction. Strong Interactions obehnke@mail.desy.de
185 H1 Collaboration Diffractive Photoproduction of Rho Mesons with Large Momentum Transfer at HERA The diffractive photoproduction of rho mesons, e p \to e rho Y, with large momentum transfer squared at the proton vertex, |t|, is studied with the H1 detector at HERA using an integrated luminosity of 20.1 pb^{-1}. The photon-proton centre of mass energy spans the range 75 < W < 95 GeV, the photon virtuality is restricted to Q^2 < 0.01 GeV^2 and the mass M_Y of the proton remnant is below 5 GeV. The t dependence of the cross section is measured for the range 1.5 < |t| < 10.0 GeV^2 and is well described by a power law, dsigma/ d|t| \propto |t|^{-n}. The spin density matrix elements, which provide information on the helicity structure of the interaction, are extracted using measurements of angular distributions of the rho decay products. The data indicate a violation of s-channel helicity conservation, with contributions from both single and double helicity-flip being observed. The results are compared to the predictions of perturbative QCD models. Strong Interactions hep-ex/0603038 obehnke@mail.desy.de
186 H1 Collaboration Elastic J/Psi Production at HERA Cross sections for elastic production of J/Psi mesons in photoproduction and electroproduction are measured in electron proton collisions at HERA using an integrated luminosity of 55 pb^{-1}. Results are presented for photon virtualities Q^2 up to 80 GeV^2. The dependence on the photon-proton centre of mass energy W_{gamma p} is analysed in the range 40 < \Wgp < 305 GeV in photoproduction and 40 < \Wgp < 160 GeV in electroproduction. The \Wgp dependences of the cross sections do not change significantly with Q^2 and can be described by models based on perturbative QCD. Within such models, the data show a high sensitivity to the gluon density of the proton in the domain of low Bjorken x and low Q^2. Differential cross sections d\sigma/dt, where t is the squared four-momentum transfer at the proton vertex, are measured in the range |t|<1.2 GeV^2 as functions of \Wgp and Q^2. Effective Pomeron trajectories are determined for photoproduction and electroproduction. The J/Psi production and decay angular distributions are consistent with s-channel helicity conservation. The ratio of the cross sections for longitudinally and transversely polarised photons is measured as a function of Q^2 and is found to be described by perturbative QCD based models. Strong Interactions hep-ex/0510016 obehnke@mail.desy.de
187 H1 Coillaboration Forward Jet Production in Deep Inelastic Scattering at HERA The production of forward jets has been measured in deep inelastic ep collisions at HERA. The results are presented in terms of single differential cross sections as a function of the Bjorken scaling variable (x_{Bj}) and as triple differential cross sections d^3 \sigma / dx_{Bj} dQ^2 dp_{t,jet}^2, where Q^2 is the four momentum transfer squared and p_{t,jet}^2 is the squared transverse momentum of the forward jet. Also cross sections for events with a di-jet system in addition to the forward jet are measured as a function of the rapidity separation between the forward jet and the two additional jets. The measurements are compared with next-to-leading order QCD calculations and with the predictions of various QCD-based models. Strong Interactions hep-ex/0508055 obehnke@mail.desy.de
188 H1 Collaboration Photoproduction of Dijets with High Transverse Momenta at HERA Differential dijet cross sections are measured in photoproduction in the region of photon virtualities Q^2 < 1 GeV^2 with the H1 detector at the HERA ep collider using an integrated luminosity of 66.6 pb^{-1}. Jets are defined with the inclusive k_T algorithm and a minimum transverse momentum of the leading jet of 25 GeV is required. Dijet cross sections are measured in direct and resolved photon enhanced regions separately. Longitudinal proton momentum fractions up to 0.7 are reached. The data compare well with predictions from Monte Carlo event generators based on leading order QCD and parton showers and with next-to-leading order QCD calculations corrected for hadronisation effects. Strong Interactions hep-ex/0603014 obehnke@mail.desy.de
189 H1 Collaboration Measurement of Charm and Beauty Dijet Cross Sections in Photoproduction at HERA using the H1 Vertex Detector A measurement of charm and beauty dijet photoproduction cross sections at the ep collider HERA is presented. Events are selected with two or more jets of transverse momentum $p_t^{jet}_{1(2)}>11(8)$ GeV in the central range of pseudo-rapidity $-0.9<\eta^{jet}_{1(2)}<1.3$. The fractions of events containing charm and beauty quarks are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured by the H1 central vertex detector. Differential dijet cross sections for charm and beauty, and their relative contributions to the flavour inclusive dijet photoproduction cross section, are measured as a function of the transverse momentum of the leading jet, the average pseudo-rapidity of the two jets and the observable $x_{\gamma}^{obs}$. Taking into account the theoretical uncertainties, the charm cross sections are consistent with a QCD calculation in next-to-leading order, while the predicted cross sections for beauty production are somewhat lower than the measurement. Strong Interactions hep-ex/0605016 obehnke@mail.desy.de
190 H1 Collaboration Search for a Narrow Baryonic Resonance Decaying to $K^0_s p$ or $K^0_s \barp$ in Deep Inelastic Scattering at HERA A search for a narrow baryonic resonance decaying to $K^0_s p$ or $K^0_s \bar p$ is carried out in deep inelastic ep scattering with the H1 detector at HERA. Such a resonance could be a strange pentaquark \thplns, evidence for which has been reported by several experiments. The $K^0_s p$ and $K^0_s \bar p$ invariant mass distributions presented here do not show any significant peak in the mass range from threshold up to 1.7 GeV. Mass dependent upper limits on $\sigma(ep \to e \thplf X)\times BR(\thplf \to K^0 p)$ are obtained at the 95% confidence level. Strong Interactions hep-ex/0604056 obehnke@mail.desy.de
191 H1 Collaboration Inclusive D* Meson Cross Sections and D* Jet Correlations in Photoproduction at HERA Differential photoproduction cross sections are measured for events containing D* mesons. The data were taken with the H1 detector at the ep collider HERA and correspond to an integrated luminosity of 51.1 pb-1. The kinematic region covers small photon virtualities Q^2 < 0.01 GeV^2 and photon-proton centre-of-mass energies of 171 < W_gammap < 256 GeV. The details of the heavy quark production process are further investigated in events with one or two jets in addition to the D* meson. Differential cross sections for D* jet production are determined and the correlations between the D* meson and the jet(s) are studied. The results are compared with perturbative QCD predictions applying collinear- or kt -factorisation. Strong Interactions hep-ex/0608042 obehnke@mail.desy.de
192 H1 Collaboration Production of D* Mesons with Dijets in Deep-Inelastic Scattering at HERA Inclusive D* production is measured in deep-inelastic ep scattering at HERA with the H1 detector. In addition, the production of dijets in events with a D* meson is investigated. The analysis covers values of photon virtuality 2< Q^2 <=100 GeV^2 and of inelasticity 0.05<= y <= 0.7. Differential cross sections are measured as a function of Q^2 and x and of various D* meson and jet observables. Within the experimental and theoretical uncertainties all measured cross sections are found to be adequately described by next-to-leading order (NLO) QCD calculations, based on the photon-gluon fusion process and DGLAP evolution, without the need for an additional resolved component of the photon beyond what is included at NLO. A reasonable description of the data is also achieved by a prediction based on the CCFM evolution of partons involving the k_T-unintegrated gluon distribution of the proton. Strong Interactions hep-ex/0701023 obehnke@mail.desy.de
193 H1 Collaboration Tau Lepton Production in ep Collisions at HERA The production of tau leptons in ep collisions is investigated using data recorded by the H1 detector at HERA in the period 1994-2000. Tau leptons are identified by detecting their decay products, using leptonic and hadronic decay modes. The cross section for the production of tau lepton pairs is measured for the first time at HERA. Furthermore, a search for events with an energetic isolated tau lepton and with large missing transverse momentum is performed. The results are found to be in agreement with the Standard Model predictions. Physics Beyond the Standard Model hep-ex/0604022 obehnke@mail.desy.de
194 H1 Collaboration Search for Lepton Flavour Violation in ep Collisions at HERA A search for the lepton flavour violating processes ep~$\rightarrow \mu$~X and ep$\rightarrow \tau$~X is performed with the H1 experiment at HERA. Final states with a muon or tau and a hadronic jet are searched for in a data sample corresponding to an integrated luminosity of 66.5~pb$^{-1}$ for $e^{+}p$ collisions and 13.7~pb$^{-1}$ for $e^{-}p$ collisions at a centre-of-mass energy of 319~GeV. No evidence for lepton flavour violation is found. Limits are derived on the mass and the couplings of leptoquarks inducing lepton flavour violation in an extension of the Buchm\"{u}ller-R\"{u}ckl-Wyler effective model. Leptoquarks produced in ep collisions with a coupling strength of $\lambda$=0.3 and decaying with the same coupling strength to a muon-quark pair or a tau-quark pair are excluded at 95\% confidence level up to masses of 459~GeV and 379~GeV, respectively. Physics Beyond the Standard Model hep-ex/0703004 obehnke@mail.desy.de
195 H1 Collaboration Search for Doubly-Charged Higgs Boson Production at HERA A search for the single production of doubly-charged Higgs bosons $H^{\pm \pm}$ in ep collisions is presented. The signal is searched for via the Higgs decays into a high mass pair of same charge leptons, one of them being an electron. The analysis uses up to 118~pb$^{-1}$ of $e^{\pm}p$ data collected by the H1 experiment at HERA. No evidence for doubly-charged Higgs production is observed and mass dependent upper limits are derived on the Yukawa couplings $h_{el}$ of the Higgs boson to an electron-lepton pair. Assuming that the doubly-charged Higgs only decays into an electron and a muon via a coupling of electromagnetic strength $h_{e \mu} = \sqrt{4 \pi \alpha_{em}}$=0.3, a lower limit of 141~GeV on the $H^{\pm\pm}$ mass is obtained at the 95\% confidence level. For a doubly-charged Higgs decaying only into an electron and a tau and a coupling $h_{e\tau}$=0.3, masses below 112~GeV are ruled out. Physics Beyond the Standard Model obehnke@mail.desy.de
196 H1 and ZEUS Collaborations Measurement of Events with Isolated Leptons and Missing Pt at HERA A search for events containing isolated high transverse energy electrons or muons and large missing transverse momentum produced in $e^{\pm}p$ collisions is performed with the H1 and ZEUS detectors at HERA using data taken in the period 1994-2007. The measurements are performed by H1 and ZEUS in a common phase space and combined in an analysis corresponding to a total integrated luminosity of 1~fb$^{-1}$. The results are compared to the Standard Model prediction, in particular for events containing in addition a prominent hadronic jet, where an excess was previously reported by the H1 collaboration. The cross section for the single production of $W$ bosons at HERA is also presented. Physics Beyond the Standard Model obehnke@mail.desy.de
197 H1 Collaboration Search for Multi-Lepton Events at HERA A search for for multi-lepton (electron or muon) events at high transverse momenta in ep-collisions with the H1 detector at HERA is presented, using the complete H1 dataset taken in the years 1994-2007, corresponding to an integrated luminosity of 471~pb$^{-1}$. With respect to the published HERA I multi-electron and multi-muon analyses, additional topologies with high $P_T$ electrons and muons are investigated. Yields of di-lepton and tri-lepton events are measured and a general good agreement is found with the Standard Model (SM) predictions Physics Beyond the Standard Model obehnke@mail.desy.de
198 H1 and ZEUS Collaborations Search for Multi-Lepton Events at HERA A search for multi-lepton (electron or muon) events at high transverse momenta is performed by the H1 and ZEUS Collaborations. The measurements are performed by H1 and ZEUS in a common phase space and combined in an analysis corresponding to a total integrated luminosity of 1~fb$^{-1}$. The results are compared to the Standard Model prediction Physics Beyond the Standard Model obehnke@mail.desy.de
199 H1 Collaboration Generic Analysis on HERA II Data A model-independent search for deviations from the Standard Model prediction is performed using e$^{\pm}$p data collected in 2003-07 by the H1 experiment at HERA. All event topologies involving isolated electrons, photons, muons, neutrinos and jets with high transverse momenta are investigated in a single analysis. Events are assigned to exclusive classes according to their final state. A statistical algorithm is applied to search for deviations from the Standard Model in the distributions of the scalar sum of transverse momenta or invariant mass of final state particles and to quantify their significance. Physics Beyond the Standard Model obehnke@mail.desy.de
200 H1 Collaboration Search for Excited Neutrinos at HERA A search for excited neutrinos is performed using $e^{-}p$ data collected in the years 1998-99 and 2005-06 by the H1 experiment at HERA at center-of-mass energy of 318 GeV, with a coresponding integrated luminosity of 184~pb$^{-1}$. The electroweak decays of excited neutrinos, $\nu^{*}~\rightarrow~\nu~\gamma$, $\nu^{*}~\rightarrow~\nu~Z$, $\nu^{*}~\rightarrow~eW$ are considered and possible final states resulting from the Z or W hadronic and leptonic decays are taken into account. No evidence for excited neutrino production is found. Mass dependent exclusion limits are determined for the ratio of the coupling to the compositeness scale, f/L. These limits extend the excluded region to higher masses than has been possible in previous searches. Physics Beyond the Standard Model obehnke@mail.desy.de
201 H1 Collaboration Search for Excited Electrons at HERA A search for excited electrons is performed using $e^{\pm}p$ data collected in the years 1998-2000 and 2003-07 by the H1 experiment at HERA at center-of-mass energy of 318 GeV. The electroweak decays of excited electrons, $e^{*}~\rightarrow~e~\gamma$, $e^{*}~\rightarrow~eZ$, $e^{*}~\rightarrow~\nu~W$ are considered and possible final states resulting from the Z or W hadronic decays are taken into account. No evidence for excited electron production is found. Mass dependent exclusion limits are determined for the ratio of the coupling to the compositeness scale, f/L. These limits extend the excluded region to higher masses than has been possible in previous searches Physics Beyond the Standard Model obehnke@mail.desy.de
202 H1 Collaboration Search for Excited Quarks at HERA A search for excited quarks is performed using $e^{\pm}p$ data collected in the years 1999-2000 and 2003-07 by the H1 experiment at HERA at center-of-mass energy of 318 GeV. The electroweak decays of excited electrons, $q^{*}~\rightarrow~q~\gamma$, $q^{*}~\rightarrow~qZ$, $q^{*}~\rightarrow~qW$ are considered and possible final states resulting from the Z or W decays are taken into account Physics Beyond the Standard Model obehnke@mail.desy.de
203 H1 Collaboration Search for Leptoquarks in $e^{\pm}p$ Collisions at HERA A search for scalar and vector leptoquarks coupling to first generation fermions performed in the H1 experiment using $e^{\pm}p$ data collected in the years 2003-2007 is presented. Especially the sensitivity to leptoquarks with fermion number F=2 is increased substantially w.r.t. the previous H1 results. No significant evidence for the direct production of such particles is found in a data sample with a large transverse momentum final state electron or with large missing transverse momentum. The results of the present analysis are thus combined with those of the searches in the e+p and e-p data of the HERA I phase in order to set new constraints on leptoquark models. Physics Beyond the Standard Model obehnke@mail.desy.de
204 H1 Collaboration Measurement of Event Shape Variables in Deep-Inelastic Scattering at HERA Deep-inelastic ep scattering data taken with the H1 detector at HERA and corresponding to an integrated luminosity of 106 pb^{-1} are used to study the differential distributions of event shape variables. These include thrust, jet broadening, jet mass and the C-parameter. The four-momentum transfer Q is taken to be the relevant energy scale and ranges between 14 GeV and 200 GeV. The event shape distributions are compared with perturbative QCD predictions, which include resummed contributions and analytical power law corrections, the latter accounting for non-perturbative hadronisation effects. The data clearly exhibit the running of the strong coupling alpha_s(Q) and are consistent with a universal power correction parameter alpha_0 for all event shape variables. A combined QCD fit using all event shape variables yields alpha_s(mZ) = 0.1198 \pm 0.0013 ^{+0.0056}_{-0.0043} and alpha_0 = 0.476 \pm 0.008 ^{+0.018} _{-0.059}. Strong Interactions hep-ex/0512014 obehnke@mail.desy.de
205 H1 Collaboration Inclusive Jet Production in Deep-Inelastic Scattering at High $Q^2$ at HERA and determination of the strong coupling Inclusive jet production is studied in neutral current deep-inelastic positron-proton scattering at large four momentum transfer squared $Q^2>150\gev^2$ with the H1 detector at HERA. The data were collected with the H1 detector at HERA in the years 1999 to 2000. Single and double differential inclusive jet cross sections are measured as a function of the four-momentum transfer squared $Q^2$ and of the transverse energy $E_T$ of the jets in the Breit frame. The jet cross sections are found to be well described by calculations at next-to-leading order perturbative QCD. The running of the strong coupling constant is demonstrated and the value of $\alpha_s(M_Z)$ is determined. The ratio of the inclusive jet cross section to the inclusive neutral current cross section is also measured and it yields an even more precise value for $\alpha_s(M_Z)$. Strong Interactions obehnke@mail.desy.de
206 H1 Collaboration A New Measurement of Exclusive rho^0 Meson Photoproduction Using a sample of more than 240000 events taken with the H1 detector at HERA in 2005, a new measurement of exclusive $\rho^0$ photoproduction in the kinematic range $20 < W < 90\,\GeV$ and $|t| < 3\,\GeV^2$ is performed. From the measurement of the $W$ dependence of this process in eight bins of $t$, the Pomeron trajectory $\alpha\sub{\pom}\,(t)$ can be extracted for the first time from the data of a single experiment. The result is $\alpha\sub{\pom}\,(t)$ = 1.093 \pm 0.003 (stat.) ^{+0.008}_{-0.007} + [ 0.116 \pm 0.027 (stat.) ^{+0.036}_{-0.046} (syst.)} ,\GeV^{-2} ] \cdot t Strong Interactions obehnke@mail.desy.de
207 H1 Collaboration Search for Baryonic Resonances Decaying to Xi pi in Deep-Inelastic Scattering at HERA } A search for narrow baryonic resonances decaying into Xi- pi- or Xi- pi+ and their antiparticles is carried out with the H1 detector using deep inelastic scattering events at HERA in the range of negative photon four-momentum transfer squared 2 < Q2 < 100 GeV^2. No signal is observed for a new baryonic state in the mass range $1600 - 2300 \mev$ in either the doubly charged or the neutral decay channels. The known baryon Xi(1530)^0 is observed through its decay mode into Xi-pi+. Upper limits are given on the ratio of the production rates of new baryonic states, such as the hypothetical pentaquark states Xi^{--}_{5q} or Xi^{0}_{5q} relative to the \xizero baryon state. Strong Interactions obehnke@mail.desy.de
208 D.F. Cowen for The IceCube Collaboration Neutrino Physics with IceCube The IceCube neutrino detector at the South Pole is presently the world's largest, instrumenting a volume of roughly 0.25 cubic kilometers. It surrounds the existing AMANDA detector, forming a more densely pixelated inner core region. Operated in coincidence, these detectors are in principle sensitive to neutrinos with energies ranging from below 100 GeV to above 1 EeV. Over this range, we will be able to explore the fundamental properties of neutrinos from atmospheric and presumed cosmological sources, indirectly search for WIMP dark matter, and directly search for monopoles and other exotica. IceCube is designed to map the neutrino sky in an unexplored region spanning over five orders of magnitude in energy, and will be sensitive to cosmological neutrinos of all flavors from sources such as Gamma Ray Bursts and Active Galactic Nuclei. Recent results from IceCube, the current status of the IceCube detector, and future plans will be presented. Neutrino Physics cowen@phys.psu.edu
209 B. El-Bennich, O. Leitner, J.-P. Dedonder and B. Loiseau Pseudoscalar-scalar transition form factors in $D$ decays Decay amplitudes of $D(D_s) \to S-PS$, where $S$ and $PS$ mean scalar and pseudoscalar mesons respectively, are compared to experimental branching ratios (mainly provided by the Babar and Belle facilities) in order to predict $D(D_s) \to S$ transition form factors in these amplitudes. Testing QCD factorization for $D$ decays involving scalar mesons, we focus on the cases where $S=f_0(600), \kappa, f_0(980), a_0(980), K_0^{0*}, K_0^*(1430)$ and where $PS=\pi$ or $K$. We can take advantage of these reactions to efficiently constrain the transition form factors obtained in two different relativistic quark models, i.e. the dispersion relation approach and the covariant light front formalism. Working within the constituent quark model, we phenomenologically determine the wave functions for the scalars involved in $D(D_s) \to S-PS$. The work presented here is a generalization of our previous calculations for $S=f_0(980)$. Anticipating the upcoming experimental data from CLEO-c, we hope to be getting more constraints in our analysis. Finally, predictions for $B \to S$ transition form factors will be also shown as an extension of our model. Flavour Physics and CP Violation lbennich@lpnhe.in2p3.fr
210 Hai-Yang Cheng, Chun-Khiang Chua, Amarjit Soni Charmless Three-body Decays of B Mesons Charmless 3-body decays of B mesons are studied in the framework of the factorization approach. The 3-body decay process consists of resonant contributions and the nonresonant signal. The intermediate vector meson contributions to 3-body decays are identified through the vector current, while the scalar meson resonances are mainly associated with the scalar density. Their effects are described in terms of the Breit-Wigner formalism. Apart from the nonresonant contributions arising from B to P_1P_2 transitions we have identified another large source of the nonresonant signal in the matrix elements of scalar densities. We have computed resonant and nonresonant contributions to charmless 3-body decays and studied their direct CP and mixing-indcued CP asymmetries. Flavour Physics and CP Violation phcheng@phys.sinica.edu.tw
211 Adam Trzupek, for the PHOBOS Collaboration Results from the PHOBOS experiment at RHIC Recent results from the PHOBOS experiment will be reviewed. Scaling properties of global characteristics of Cu+Cu and Au+Au collisions at RHIC energies, including charged particle multiplicity and elliptic flow, will be presented. Results on charged particle transverse momentum spectra as a function of collision energy and system size will also be presented. High-Energy Nuclear Physics Adam.Trzupek@ifj.edu.pl
212 hai-Yang Cheng, Chun-Khiang Chua, Kwei-Chou Yang Charmless hadronic B decays involving scalar mesons The hadronic charmless B decays into a scalar meson and a pseudoscalar meson or a vector meson are investigated within the framework of QCD factorization. The experimental measurements of these decays will provide valuable information on the nature of the even-parity mesons. For example, we point out that the predicted B^0 to a_0(980)^+\pi^- and a_0^+(980)K^- rates exceed the current experimental limits, favoring a four-quark nature for the a_0(980). The decay of B to \kappa^+ K^- also provides a nice ground for testing the 4-quark and 2-quark nature of the \kappa meson. It can proceed through W-exchange and hence is quite suppressed if \kappa is made of two quarks, while it receives a tree contribution if \kappa is predominately a four-quark state. Flavour Physics and CP Violation phcheng@phys.sinica.edu.tw
213 Hai-Yang Cheng, Chun-Khiang Chua Spectroscopy and Strong Decays of Charmed Baryons Many new excited charmed baryon states have been discovered by BaBar, Belle and CLEO in recent years. Charmed baryon spectroscopy provides an ideal place for studying the dynamics of the light quarks in the environment of a heavy quark. We analyze the strong decays of charmed baryons in the framework of heavy hadron chiral perturbation theory. We also discuss the first positive-parity excited charmed baryons and make a conjecture on the states \Lambda_c(2880), Lambda_c(2940), \Xi_c(2980) and \Xi_c(3077). Strong Interactions phcheng@phys.sinica.edu.tw
214 Peter Krizan (for the Belle Aerogel RICH group) Proximity focusing RICH with TOF capabilities A proximity focusing RICH with aerogel radiator has been studied to further improve the pion-kaon separation in the forward region of the Belle spectrometer. Such a proximity focusing RICH counter is also a very fast detector, in particular if a micro-channel plate (MCP) PMT is used as the photon detector. With its excellent timing properties, the same device could also serve as a time-of-flight counter and thus supplement other identification methods, in particular for low momentum tracks. Cherenkov photons emitted in the radiator medium (aerogel) as well as in the entrance window of the PMT could be used for the time-of-flight measurement. A prototype of this novel device using BURLE 85011 64-anode, microchannel plate PMT, was tested on the bench and in the test beam at KEK. Excellent performance of this counter could be demonstrated. In particular, a good separation of pions and protons was observed in the test beam data with a time-of-flight resolution of about 35ps (rms) for Cherenkov photons produced in the PMT window. Detectors and Data Handling peter.krizan@ijs.si
215 S. Descotes-Genon, J. Matias, J. Virto Connecting B_d and B_s decays with flavour symmetries and QCD factorisation We present an analysis of penguin-dominated B_d and B_s decay modes within the SM, relating them in a controlled way through SU(3)-flavour symmetry and QCD-improved factorisation. We propose a set of sum rules for the observables related to such decays. To illustrate our purpose, we determine observables for some B_s decays, such as B_s->K0K0, as functions of their B_d counterpart, and discuss the phenomenological impact of such relations. Flavour Physics and CP Violation "hep-ph/0701116, hep-ph/0611280, hep-ph/0603239" descotes@th.u-psud.fr
216 S. Descotes-Genon Pi-pi and pi-K scatterings in resummed Chiral Perturbation Theory Chiral symmetry breaking may exhibit significantly different patterns in two chiral limits: N_f=2 massless flavours (m_u=m_d=0, m_s physical) and N_f=3 massless flavours (m_u=m_d=0=m_s=0). Such a difference, related to the violation of the Zweig rule in the scalar sector, could yield a numerical competition between contributions counted as leading order and next-to-leading in the chiral expansions of observables. We introduce Resummed Chiral Perturbation Theory to deal with such instabilities. We analyse data on pi-pi and pi-K scatterings within this framework to constrain the quark mass ratio as well as the quark condensate and the pseudoscalar decay constant in the N_f=3 chiral limit. The results favour significant contributions of vacuum fluctuations suppressing the N_f=3 quark condensate compared to its N_f=2 counterpart. Strong Interactions hep-ph/0703154 descotes@th.u-psud.fr
217 Rok Pestotnik Silicon photomultiplier as a position sensitive detector of Cherenkov photons Silicon photomultipliers are semiconductor photo-sensitive devices build from an avalanche photodiode (APD) matrix on a common silicon substrate, working in the limited Geiger mode. One of the benefits if compared to other position sensitive detectors which are used in the Ring Imaging Cherenkov (RICH) Counters is their insensitivity to the high magnetic fields. They have several other advantages (lower operation voltage, less material) over the conventional photomultiplier tubes. They also have a high peak photon detection efficiency (approx 20%), a high gain of ~10^6 and a good time response. Due to their dimensions, they allow compact, light and robust mechanical designs. All this would make them a very promising candidate for a photon detector of Cherenkov photons in a RICH counter. However, due to their serious disadvantage, a very high dark rate (~1 MHz), they have up to now never been used in Cherenkov detectors, where single photon detection is required at low noise. One of the main issues of the present study was therefore to adapt this photo-sensor to single photon counting. In the contribution we will present the experimental results on the measurements of single photo-electron pulse height and timing distribution, uniformity of the response and photon detection efficiency of individual SiPMs. From an array of SiPMs a small prototype detector has been constructed and tested with Cherenkov photons from cosmic muons. To increase the efficiency of such a detector, different light collection systems have been evaluated. At the end we will discuss the design optimization of a proximity focusing RICH counter for the upgraded Belle spectrometer with silica aerogel as the radiator medium and the SiPM array as the photon detector. Detectors and Data Handling rok.pestotnik@ijs.si
218 S. Descotes-Genon and B. Moussallam The kappa meson from Roy-Steiner representations of pi-K scattering We discuss the existence of the light scalar meson K^*_0(800) (also called kappa) in a rigorous way, by showing the presence of a pole in the pi K --> pi K amplitude on the second Riemann sheet. For this purpose, we study the domain of validity of two classes of Roy-Steiner representations in the complex energy plane. We prove that one of them is valid in a region sufficiently broad in the imaginary direction. From this representation, we compute the l=0 partial wave in the complex plane with neither additional approximation nor model dependence, relying only on experimental data. A scalar resonance with strangeness S=1 is found with the following mass and width: E_kappa = 658 \pm 13 MeV and Gamma_kappa = 557 \pm 24 MeV. Strong Interactions "hep-ph/0607133, hep-ph/0310283 " descotes@th.u-psud.fr
219 V.I.Kolesnikov, G.L.Melkumov for the NA49 Collaboration Anti-nuclei and Nuclei Production in Pb+Pb Collisions at CERN SPS Energies. Results of a comprehensive study of light (anti)nuclei production in Pb+Pb collisions at SPS energies (20A, 30A, 40A, 80A and 158A GeV) carried out by the NA49 experiment at the CERN SPS will be reported. Rapidity and transverse momentum spectra of helium (A=3), tritium, deuteron and anti-deuteron as well as protons and anti-protons were measured. Broad phase-space coverage allow to obtain for the first time total multiplicity of helium (A=3) and its dependence on incident energy and collision centrality in the entire SPS energy domain. A surprisingly good agreement is observed between the measured yields for helium and those predicted by the Statistical Hadronization Model. The mid-rapidity transverse mass spectra of tritium, deuteron, ant-deuteron, proton and anti-proton were measured in centrality selected Pb+Pb collisions at 20A-158A GeV. The dependence of the yield ratios and the inverse slope parameter of the m_T spectra on collision energy, centrality and the mass number of the produced nucleus will be presented and discussed within coalescence and statistical approaches. High-Energy Nuclear Physics kolesnik@moonhe.jinr.ru
220 FP420 Collaboration The FP420 project: the challenge of measuring forward protons at the LHC FP420 is an R&D project to assess the feasibility of installing proton detectors at 420m from the ATLAS and CMS interaction points at the LHC. They would function as new sub-detectors at ATLAS/CMS, allowing the measurement of the spatial position and arrival time of protons scattered at very low angles with fractional momentum loss between 0.2% and 2%. Forward proton tagging in this region is expected to open a new programme of electroweak, QCD and BSM physics. The challenges of the project are presented, along with the solutions envisaged, notably for the replacement cryostat, the detectors, the moving mechanism to bring the detectors close to the beam, and the alignment. Detectors and Data Handling arneodo@to.infn.it
221 FP420 Collaboration The FP420 project: the physics potential FP420 is an R&D project to assess the feasibility of installing proton detectors at 420m from the ATLAS and CMS interaction points at the LHC. They would function as new sub-detectors at ATLAS/CMS, allowing the measurement of the spatial position and arrival time of protons scattered at very low angles with fractional momentum loss between 0.2% and 2%. Such detectors would allow the possibility of exploiting the central exclusive production process to extend the discovery reach of ATLAS and CMS. The physics program of FP420 is discussed, including central exclusive production of light Standard Model or MSSM Higgs Bosons, the measurement of the Higgs quantum numbers, and a wide range of electroweak, QCD and BSM physics. Strong Interactions "Also submitted to the following Sessions: High-Energy Electroweak Physics, Physics Beyond the Standard Model" arneodo@to.infn.it
222 FP420 Collaboration The FP420 project: the physics potential FP420 is an R&D project to assess the feasibility of installing proton detectors at 420m from the ATLAS and CMS interaction points at the LHC. They would function as new sub-detectors at ATLAS/CMS, allowing the measurement of the spatial position and arrival time of protons scattered at very low angles with fractional momentum loss between 0.2% and 2%. Such detectors would allow the possibility of exploiting the central exclusive production process to extend the discovery reach of ATLAS and CMS. The physics program of FP420 is discussed, including central exclusive production of light Standard Model or MSSM Higgs Bosons, the measurement of the Higgs quantum numbers, and a wide range of electroweak, QCD and BSM physics. High-Energy Electroweak Physics "Also submitted to the following Sessions: Strong Interactions, Physics Beyond the Standard Model" arneodo@to.infn.it
223 FP420 Collaboration The FP420 project: the physics potential FP420 is an R&D project to assess the feasibility of installing proton detectors at 420m from the ATLAS and CMS interaction points at the LHC. They would function as new sub-detectors at ATLAS/CMS, allowing the measurement of the spatial position and arrival time of protons scattered at very low angles with fractional momentum loss between 0.2% and 2%. Such detectors would allow the possibility of exploiting the central exclusive production process to extend the discovery reach of ATLAS and CMS. The physics program of FP420 is discussed, including central exclusive production of light Standard Model or MSSM Higgs Bosons, the measurement of the Higgs quantum numbers, and a wide range of electroweak, QCD and BSM physics. Physics Beyond the Standard Model "Also submitted to the following Sessions: Strong Interactions, High-Energy Electroweak Physics" arneodo@to.infn.it
225 E.N. Myasnikov, E.V. Mastropas Spontaneous breaking of spatial homogeneity of vacuum by quarks and properties of hadrons. A possible breaking of spatial homogeneity of vacuum due to the interaction between quark and Bose-field is analyzed. It is shown that in this case quark can be in a localized state (like wave packet). Energetic conditions for such a spontaneous symmetry breaking are found in suggested model. Possible consequences of such symmetry breaking, in particular, the origin of deep inelastic processes and quark confinement phenomenon are discussed. Flavour Physics and CP Violation mastropas@rambler.ru
226 U. Jamil and J. K. Sarma Solutions of Polarized Coupled DGLAP Evolution Equations for Singlet and Gluon Structure Functions in Next to Leading Order at low-x In this paper, we solved the polarized coupled Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations for singlet and gluon structure functions in next to leading order (LO) at low-x assuming the Regge behaviour of polarized quark and gluon structure functions at this limit, and t and x-evolutions of polarized singlet and gluon structure functions are presented. We have compared our theoretical work with SLAC-E-143, SLAC-E-154, SMC collaborations data and also with the curve obtained solving unified evolution equation by numerical method. We have shown that the solutions of polarized coupled equations give accurate results for the polarized structure functions and also the compatibility of Regge behaviour of polarized quark and gluon structure functions with perturbative quantum chromodynamics (PQCD) at low-x. Strong Interactions jamil@tezu.ernet.in
227 H1 Collaboration Search for Events with an Isolated Tau Lepton and Missing Pt at HERA A search for the production of tau leptons in ep-collisions with the H1 detector at HERA is presented, using the complete H1 dataset taken in the years 1994-2007, corresponding to an integrated luminosity of 471~pb$^{-1}$. Tau leptons are identified by using an identification algorithm based on the search for isolated charged tracks associated to narrow hadronic jets detected in the calorimeters, a typical signature of the one-prong hadronic tau decay. Physics Beyond the Standard Model obehnke@mail.desy.de
228 H1 Collaboration Search for Events with an Isolated Lepton and Missing Pt at HERA The search for events containing isolated leptons (electrons or muons) and missing transverse momentum produced in e$^{\pm}$p collisions is performed with the H1 detector at HERA in the period 1994-2007. The analysis now examines the complete H1 data sample, corresponding to an integrated luminosity of 478~pb$^{-1}$, which includes 189~pb$^{-1}$ of $e^{+}p$ data (2003-04 and 2006-07) and 170~pb$^{-1}$ of $e^{-}p$ data (2004-06) from the HERA~II phase. An excess of events compared to the Standard Model prediction is observed in the $e^{+}$ data at large hadronic transverse momentum $P_{T}^{X} >$ 25 GeV. Events with large transverse momentum are observed in both the HERA I and II $e^{+}p$ samples. Physics Beyond the Standard Model obehnke@mail.desy.de
229 H1 Collaboration Strangeness production in deep-inelastic scattering at HERA The inclusive production cross sections of strange neutral particles in deep-inelastic ep scattering at HERA are measured with the H1 detector. The data were taken in the years 1996 to 2000 at a center of mass energy of 300 - 318 GeV and sum up to a luminosity of 75 pb-1. The cross sections are determined for the kinematic region of small four-momentum transfer 2 < Q^2< 100 GeV^2 and inelasticity 0.1 < y < 0.6 and the visible range |\eta(K0_S,\Lambda)| < 1.3 and p_T(K0_S,\Lambda) > 0.5 GeV. The measured cross sections are compared with different model predictions. Strong Interactions obehnke@mail.desy.de
230 H1 Collaboration A combined electroweak and QCD analysis at HERA with longitudinally polarised e^+/e^- beams Using the deep inelastic e^+p and e^-p charged and neutral current scattering cross sections, including data with polarised electron beams, a combined electroweak and QCD analysis is performed to determine electroweak parameters accounting for their correlation with parton distributions. The precision has been improved in particular for u quark coupling to the Z boson with respect to the published results based on the unpolarized HERA data only. The determinations from HERA are compared with those from LEP and Tevatron. High-Energy Electroweak Physics obehnke@mail.desy.de
231 H1 Collaboration High Q2 Charged Current in polarised ep collisions Data taken with electrons of different longitudinal polarisation states in collision with unpolarised protons at HERA are used to measure the total cross sections of the charged current process, e^- p -> nu X, for negative four-momentum transfer squared Q^2 > 400 GeV^2 and inelasticity y<0.9. Together with the corresponding cross section obtained from the previously published unpolarised data, the polarisation dependence of the charged current cross section is measured and found to be in agreement with the Standard Model prediction. The polarised charged current results are used to set limits on right-handed charged current interactions. High-Energy Electroweak Physics obehnke@mail.desy.de
232 H1 Collaboration High Q2 Neutral Current in polarised ep collisions The inclusive single differential cross section ${\rm d}\sigma/{\rm d}Q^2$ and the reduced double differential cross section $\tilde{\sigma}(x,Q^2)$ are presented for the neutral current process, $e^{\pm}p \rightarrow e^{\pm} X$, in interactions with longitudinally polarised lepton beams. The cross sections are measured in the region of large negative four-momentum transfer squared, $Q^2 \geq 200\,{ m GeV}^2$ and inelasticity, $y<0.9$. The data are consistent with the expected $Q^2$ dependence of polarised cross sections. The reduced cross section data are combined together with previously published unpolarised data to determine the structure function $x ilde{F}_3$ with improved precision. The data are compared to predictions of the Standard Model which is able to provide a good description of the data. The polarized cross section asymmetries in neutral current are used to demonstrate parity violating effects in electroweak interactions. From the dependence of the neutral current cross section on $Q^2$, a limit on the quark charge radius is extracted. High-Energy Electroweak Physics obehnke@mail.desy.de
233 H1 Collaboration Neutral Current Cross Section at High Y and Intermediate $Q^2$ in ep collisions A measurement of the reduced double differential cross section $\tilde{\sigma}(x,Q^2)$ is presented for the neutral current process, $ep$, at high $0.9>y>0.63$ and intermediate $1000>Q^2>60$~GeV$^2$ range. The cross section measurement uses complete HERA-II data set and represents about twofold improvement in precision compared to the previous H1 publication. The high $y$ cross section is sensitive to the proton structure functions $F_2$ and $F_L$ and thus provides additional constraint on the gluon density function. Using DGLAP fit to the lower $Q^2$ H1 data, the contribution of the $F_L$ structure function to the cross section is determined. Strong Interactions obehnke@mail.desy.de
234 H1 Collaboration Measurement of the Inclusive ep Scattering Cross Section at low Q^2 and x at HERA A new measurement of the inclusive $ep$ scattering cross section is presented in the region of low four-momentum transfer squared, $0.2$\,GeV$^2$ $\leq Q2 \leq 8.5$\,GeV$^2$, and low Bjorken $x$, $4 \cdot 10^{-6} \lesssim x \lesssim 0.02$. The results are based on two data sets collected in dedicated runs by the H1 Collaboration at HERA at beam energies of 27.6\,GeV and 920\,GeV for positrons and protons. A combination with data previously published by H1 leads to a scattering cross section measurement of accuracy to a few percent. The data include the region of high inelasticity $y$ up to 0.85, which is sensitive to the longitudinal proton structure function $F_L(x,Q2)$. A reconstruction method based on the use of radiative $ep$ scattering events extends the measurement to lower $Q2$ and into the domain of larger $x$. The data are compared with theoretical models which apply to the transition region from quasi-real photoproduction to deep inelastic scattering. Strong Interactions obehnke@mail.desy.de
235 Chun-Khiang Chua Extracting the unitarity angle gamma in Bs to D0 h0, D0bar h0 Decays The recently observed color-suppressed B0bar to D0 pi0, D0 eta, D0 eta', Ds+ K-, D0 K0bar, D0 rho0 and D0 omega decay modes all have rates larger than expected. The color-suppressed Bs to D0 phi, D0bar phi modes, which were suggested for the extraction of the unitarity angle gamma in the Gronau-London method, could be larger than the previous estimation by one order of magnitude. Several new theoretical clean modes in Bs decays are suggested for the extraction of gamma. The proposed Bs to D0 h0, D0bar h0 decay modes with h0 = pi0, eta, eta', rho0, omega in addition to h0 = phi are free from penguin contributions. Their decay rates can be estimated from the observed color-suppressed B0bar to D0 h0 rates through SU(3) symmetry. A combined study of these D0 h0, D0bar h0 modes in addition to the D0 phi, D0bar phi modes is useful in the extraction of gamma in the Bs system without involving the Bs-Bsbar mixing. Since the b to u and b to c transitions belong to the same topological diagram, the relative strong phase is likely to be small. In this case, the CP asymmetries are suppressed and the untagged rates are very useful in the gamma extraction. Flavour Physics and CP Violation "Based on the work published in Phys. Lett. B633, 70-74 (2006)." ckchua@cycu.edu.tw
236 H1 Collaboration Measurement of the Inclusive ep Scattering Cross Section at medium Q^2 and x at HERA A new measurement of the inclusive $ep$ scattering cross section is presented in the region of medium four-momentum transfer squared, $12$\,GeV$^2$ $\leq Q2 \leq 150$\,GeV$^2$, and low Bjorken $x$, $4 \cdot 10^{-4} \lesssim x \lesssim 0.1$. The results are based on the data collected in 2000 with the H1 configuration optimal for the measurement in this kinematic domain. The accuracy of the cross section measurement reaches unprecedented in this kinematic range $1.5-2\%$ level. The new cross section measurement is compared with the predictions of the DGLAP QCD evolution. Strong Interactions obehnke@mail.desy.de
237 H1 Collaboration Measurement of the Inclusive ep Scattering Cross Section at low Q^2 and high y at HERA A new measurement of the inclusive $ep$ scattering cross section is presented in the region of low four-momentum transfer squared, $12$\,GeV$^2$ $\leq Q2 \leq 150$\,GeV$^2$, and very high inelastisity, $0.75 Strong Interactions obehnke@mail.desy.de
238 H1 Collaboration Measurement of diffractive dijet photo-production at HERA A new measurement is presented of differential dijet cross section in diffractive photoproduction (Q^2<0.01 GeV^2) at HERA. The measurement is based on the data collected with the H1 detector in positron-proton collisions in years 1999 and 2000 with an integrated luminostiy of ~55 pb^-1. The results are compared to LO and NLO QCD calculations based on diffractive parton densities previously obtained from a QCD analysis of inclusive diffractive DIS cross sections by H1. The event topology is given by ep->eXY in which system X, containing at least two jets, is separated from a leading-low mass proton dissociative system Y by a large rapidity gap. The ratio of differential dijet diffractive cross section to dijet inclusive cross section in photoproduction is measured as a function of fractional momentum of the photon entering the hard subprocess, x_gamma, and compared to LO and NLO QCD predictions. Strong Interactions obehnke@mail.desy.de
239 H1 Collaboration Diffractive photon scattering at large momentun transfer in photoproduction at HERA The diffractive photon scattering with large momentum transfer in photoproduction regime is measured for the first time at HERA. The data were collected in $e^+ p$ interactions by the H1 detector using an integrated luminosity of $43.7\mathrm{pb}^{-1}$. The analysis is based on a data sample in with photoproduction reactions are tagged by the detection of the scattered positron in a calorimeter close to the beam pipe limiting the photon virtuality to $Q^2 < 0.01$ GeV$^2$ and the photon-proton center-of-mass energy, $W$, to the range $175 < W < 247 \ {\rm GeV}$. The measured cross section is presented as a function of $W$ and differentially in $t$ limited to $|t| > 4$ GeV$^2$, where $t$ is the square of the four-momentum transferred at the proton vertex. The results are found to be consistent with a model based on perturbative QCD calculated using the leading logarithmic approximation of BFKL. Strong Interactions obehnke@mail.desy.de
240 ALEPH Collaboration Measurement of the cross section of open b production in two-photon interactions at LEP Inclusive production of b quarks by two photons has been measured with ALEPH using about 700 pb-1 at centre-of-mass energies between 130 and 209 GeV. Strong Interactions Roberto.Tenchini@cern.ch
241 C J Chammasheril and P C Vinodkumar Sensitivity of Quark Matter EoS Parameters and Quark Star Properties. Understanding of inter-quark interactions is very important not only from high energy physics but also from one of the most enigmatic problem of astrophysics: “The existence of deconfined quark matter inside the neutron star”. Most of the approaches to address this problem are based on phenomenological models for quark interactions. MIT-Bag model [1] and Effective Bag model [2] are very popularly employed models in studies on strange stars and hybrid stars and we have considered these two models for the present study. These models have certain parameters, known only in a range of values. This leads to a situation in which, we get set of equation of state for a given model. It is interesting to study, qualitatively and quantitatively, the influence of these parameters on equations of state and strange and hybrid stars properties obtained using them. For this purpose we define “sensitivity” as fractional change in pressure with respect to fractional change in the parameter of interest and studied the influence of this parameters on pressure. We extend this concept of “sensitivity” to study the influence on strange star and hybrid star properties. Results of our studies, merits and demerits based on "sensitivity" and relevant values of parameters in light of claims of high mass neutron stars will be presented. [1] Farhi E and Jaff R (1984) Phys. Rev. D 30,2379. [2] Schertler K, Greiner C, Thoma M (1997) Nucl. Phys.A 616, 659. Astroparticle Physics, Gravitational Waves and Cosmology clementcj@rediffmail.com
242 I.Adachi on behalf of the Belle Aerogel RICH R&D group Study of a Proximity Focusing RICH Based on a Silica Aerogel Radiator A proximity focusing RICH using a silica aerogel Cherenkov radiator has been developed for new particle identification device in the upgraded Belle detector. To further improve the detector performance, a new concept for Cherenkov ring imaging has been introduced, where multiple aerogel layers with different indices are accumulated to increase the number of detected photoelectrons without making the Cherenkov photon angle resolution worse. By constructing a prototype counter, this idea was validated in a test beam experiment, and we achieved 5.5 $¥sigma$ $¥pi/K$ separation at 4 GeV/c with more than 9 photoelectrons. We will demostrate new results from the latest test beam experiment including recent improvements on both of a silica aerogel radiator and a photon detector. Detectors and Data Handling ichiro.adachi@kek.jp
243 T. Maki for the CDF Collaboration Top quark mass measurement in dilepton channel We present a top quark mass measurement using 1.2 fb^-1 of Run II data collected by the CDF experiment at Fermilab. The measurement uses ttbar event candidates having two high transverse momentum leptons, at least two jets and missing transverse energy from escaping neutrinos. Reconstruction of the top quark mass from dilepton events involves an underconstrained system. In this analysis, it is resolved by introducing an additional equation for the longitudinal momentum of the ttbar system. The top quark mass is reconstructed for each event, and the final result is achieved by comparing the resulting distribution from data to Monte Carlo templates. High-Energy Electroweak Physics tmaki@fnal.gov
244 H1 Collaboration Three- and Fourjet Production in Deep Inelastic ep Scattering and low x Parton Dynamics at HERA Differential three- and fourjet cross sections in deep inelastic ep scattering at low x and Q^2 have been measured with the H1 detector using an integrated luminosity of 44.2 pb^{-1}. Several phase-space regions have been selected for the threejet analysis in order to study parton dynamics from the most global topologies to the most restrictive regions of forward jets (close to the proton-direction). The measurements of threejet cross sections are compared with fixed order QCD predictions of O(\alpha_s^2) and O(\alpha_s^3) and with two leading order MC predictions where additional partons are generated by parton showers and according to the color dipole model, respectively. A good description of the threejet cross sections is given by the O(\alpha_s^3) prediction for which remaining differences are concentrated at low x and topologies with two forward jets, which are most sensitive to unordered gluon radiation. The LO MC with unordered gluon radiation modeled by the color dipole model gives a good description of both the three- and the fourjet data in absolute normalisation and shape. These results are interpreted as strong hints for the presence of large contributions from gluon radiation not ordered in transverse momentum at low x and forward rapidities. Strong Interactions obehnke@mail.desy.de
245 Bo Jayatilaka, Chris Hays, Ashutosh Kotwal, Larry Nodulman, Oliver Stelzer-Chilton, William Trischuk, Ian Vollrath First Measurement of the W Boson Mass with CDF in Run II We describe a measurement of the $W$ boson mass $m_W$ using $\approx$200 pb$^{-1}$ of $\sqrt{s}$=1.96 TeV $p\bar{p}$ collision data from the Fermilab Tevatron collected with the CDF II detector. Using 63,964 $W\rightarrow e\nu$ candidates and 51,128 $W\rightarrow \mu\nu$ candidates, we measure $m_W = 80.413 \pm 0.034~{\rm (stat)} \pm 0.034~{\rm (sys)}$ GeV/$c^2$. With a total uncertainty of 0.048 GeV/$c^2$, this is the single most precise $m_W$ measurement to date. High-Energy Electroweak Physics oliversc@fnal.gov
246 Belle Collaboration Evidence for $D^0--\overline{D}^0$ Mixing We observe evidence for $D^0 --\overline{D}^0$ mixing by measuring the difference in effective lifetime when a $D^0$ meson decays to the $CP$ eigenstates $K^+K^-$ and $\pi^+\pi^-$, and decays to the final state $K^-\pi^+$. The relative difference of lifetimes is found to be $y_{CP}=(1.31\pm 0.32({\rm stat.})\pm 0.25({\rm syst.}))\%$. The value differs from zero by 3.2 standard deviations and hence represents clear evidence for mixing, regardless of possible CP violation. We also search for the latter, and find no evidence for it. These results are based on 540~fb$^{-1}$ of data recorded by the Belle detector at the KEKB asymmetric $e^+e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
247 Belle Collaboration Study of $D^0--\overline{D}^0$ mixing using Dalitz analysis of We report on a study of $D^0--\overline{D}^0$ mixing in $D^0 \to K_S^0 \pi^+\pi^-$ decays using a Dalitz plot analysis. The observables in the analysis are the mixing parameters $x$ and $y$, for which we obtain $x=(0.80\pm0.29^{+0.09+0.15}_{-0.07-0.14})\%$ and $y=(0.33\pm0.24^{+0.07+0.08}_{-0.12-0.09})\%$ assuming no $CP$ violation. The quoted errors are statistical, experimental systematical and systematical arising from modelling of the Dalitz distribution. Results are based on 540 fb$^{-1}$ of data accumulated by the Belle detector at KEKB. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
248 Belle Collaboration Study of $\Omega_c^0$ at Belle We present a measurement of the $\Omega_c^0$ mass using a sample of $\Omega^- \pi^+$ decays. We also present preliminary results of a study of the $\Omega_c^*$ excited state. The analysis is based on a large data sample recorded at the $\Upsilon(4S)$ resonance and nearby continuum with the Belle detector at the KEKB $e^+e^-$ energy-asymmetric collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
249 Belle Collaboration Measurement of the near-threshold $e^+e^- \to D\bar{D}$ and We report on a measurement of the exclusive $e^+e^- \to D\bar{D}$, where $D=D0$ or $D^+$, and $e^+e^- \to {Lambda_c}^{\pm}{Lambda_c}^{\mp}$ cross sections as a function of center-of-mass energy near the $D \bar{D}$ and ${Lambda_c}^{\pm} {Lambda_c}^{\mp}$ thresholds with initial state radiation. A full reconstruction technique is used. The analysis is based on a large data sample collected with the Belle detector at the $\Upsilon(4S)$ resonance and nearby continuum at the KEKB asymmetric-energy $e^+ e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
250 Belle Collaboration A search for new charmonium states above $D\bar{D}$ threshold We present a study of the $X(3940)$ state and a further search for other charmonium states above $D\bar{D}$ threshold recoiling against the $J/\psi$ in the $e^+ e^-$ annihilation. The analysis is based on a large data sample recorded at the $\Upsilon(4S)$ resonance and nearby continuum with the Belle detector at the KEKB $e^+e^-$ energy-asymmetric collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
251 Belle Collaboration Study of $D_{s1}(2536)^+$ decays into $D^+\pi^-K^+$ and $D^{* +}K_S$ We report the analysis of the decay $D_{s1}(2536)^+ \to D^+\pi^- K^+$ using 462~fb$^{-1}$ data sample collected with the Belle detector near the $\Upsilon(4S)$ resonance. We also study the angular distributions in the $D_{s1}(2536)^+ \to D^{*+} K^0_S$ decay, measure the relative D- and S-wave widths and establish the dominance of the latter. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
252 Belle Collaboration Search for $B^0 \to \Lambda_c^+ \Lambda_c^-$ decay at Belle We search for the double charmed baryonic decay $B^0 \to \Lambda_c^+\Lambda_c^-$. This analysis is based on a large data sample accumulated at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric $e^+e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
253 Belle Collaboration Study of intermediate two-body decays in $\bar{B}^0\to \Sigma_c(2455)^{0}\bar{p}\pi^{+}$ decay. We study the three-body decay $\bar{B}^0\to \Sigma_c(2455)^{0}\bar{p}\pi^{+}$, and observe a broad mass structure in the $\bar{p}\pi^+$ system near $1.5\,{\rm GeV}/c2$. This structure is due to the two-body cascade decay $\bar{B}^0\to \Sigma_c(2455)^{0} (\bar{p}\pi^{+})$. This analysis is based on a data sample of 357 fb$^{-1}$, accumulated at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric $e^+e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
254 Belle Collaboration Measurement of ${\cal B}(D_s^+ \to \mu^+ \nu_mu)$ We present a study of $D_s$ decays to $\mu \nu_\mu$ using a large data sample collected by the Belle experiment at the KEKB $e^+ e^-$ collider. The $D_s$ decays are tagged by fully reconstructing events of the type $e^+e^- \to D_s D K X$, where X represents additional charged and neutral particles. The reconstruction method provides good resolution in the neutrino momentum and thus also good background separation. The absolute value of ${\cal B}(D_s^+\to\mu^+\nu_\mu)$ is determined. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
255 Belle Collaboration Measurement of ${\cal B}(D0\to \pi^+\pi^- \pi^0)/{\cal B}(D0 \to K \pi \pi^0)$ We present the results of the precise measurement of ${\cal B}(D0 \to \pi^+ \pi^- \pi^0)$/${\cal B}(D0 \to K \pi \pi^0)$ using a large data sample collected with the Belle detector at the $\Upsilon(4S)$. We also searched for the $CP$ violation in this decay by measuring the asymmetry $A=({\cal B}(D0 \to \pi^+ \pi^- \pi^0) - {\cal B}(\bar{D0} \to \pi^+ \pi^- \pi^0))/({\cal B}(D0 \to \pi^+ \pi^- \pi^0) + {\cal B}(\bar{D0} \to \pi^+ \pi^- \pi^0))$. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
256 Belle Collaboration Study of $X(3872)$ production in neutral $B$ meson decays. The diquark anti-diquark model of Maiani, Piccinini, Polosa and Riquer predicts that the observed $X(3872)$ is one component of a doublet of states. In this model, the $``X(3872)''$ produced in neutral $B$ meson decays will have a mass that is different from its counterpart in charged $B$ meson decays by $\Delta M = (7 \pm 2~{\rm MeV}/\cos 2\theta$, where $\theta$ is a mixing angle that is near $\pm 200$. We report results of studies of the properties of $X(3872)$ mesons produced via neutral and charged $B$ meson decay modes. The results are based on an analysis of a large data sample collected at the $\Upsilon(4S)$ resonance with the Belle detector operating at the KEKB asymmetric energy $e^+e^-$ storage rings. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
257 Belle Collaboration Search for lepton flavor violating $\tau$ decays to 3 leptons We report results of a search for lepton flavor violating $\tau$ decays into 3 lepton final states using a large data sample accumulated with the Belle detector at the KEKB $e^+ e^-$ collider. The sensitivity for these processes has improved considerably compared to previous experimental results. Physics Beyond the Standard Model Yoshihide.Sakai@kek.jp
258 Belle Collaboration Search for lepton flavor violating $\tau\to l V^0$ decays at Belle We report results for $\tau$ decays lepton and a neutral vector meson using more 500 fb$^{-1}$ of data. We have improved the sensitivity for the processes by a factor of two compared to previous experimental results and obtained the first limits for the modes $\tau \to \mu/(e) \omega$. Physics Beyond the Standard Model Yoshihide.Sakai@kek.jp
259 Belle Collaboration Precise measurement of $\tau$ hadronic decays in modes with $\eta$ mesons Precise measurements of branching fractions for $\tau$ hadronic decays involving an $\eta$ meson are presented for a large dataset currently available with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
260 Belle Collaboration Study of $\tau^-\to K_S \pi^-\nu_{\tau}$ decay at Belle. We present a study of $\tau^-\to K_S \pi^-\nu_{\tau}$ decay using a data sample corresponding to an integrated luminosity of $351\ \rm{fb^{-1}}$ collected with the Belle detector. The analysis is based on $53110$ lepton-tagged signal events. The measured branching ratio is consistent with the world average value and has better accuracy. An analysis of the $K_S\pi$ invariant mass spectrum reveals contributions from the $K^*(892)$ as well as other states. For the first time $K^*(892)$ mass and width have been measured in $\tau$ decay. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
261 Belle Collaboration Evidence for CP Violation in B^0 -> D^+D^- Decays We report measurements of the branching fraction and $CP$ violation parameters in $B^0 \to D^+ D^-$ decays. The results are based on a data sample that contains $535 \times 10^6$ $B\overline{B}$ pairs collected at the $\Upsilon(4S)$ resonance, with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We obtain $ \left[1.97 \pm 0.20 \,\textrm{(stat)}\, \pm 0.20\,\textrm{(syst)}\,\right] \,\times 10^{-4} $ for the branching fraction of $B^0 \to D^+D^-$. The measured values of the $CP$ violation parameters are: \mbox{$\mathcal S = -1.13 \, \pm 0.37 \,\pm 0.09$}, \mbox{$\mathcal A = 0.91 \, \pm 0.23 \,\pm 0.06$}, where the first error is statistical and the second is systematic. We find evidence of $CP$ violation in $B^0 \to D^+ D^-$ at the $4.1\,\sigma$ confidence level. While the value of $\mathcal S$ is consistent with expectations from other measurements, the value of the parameter $\mathcal A$ favors large direct $CP$ violation at the $3.2\,\sigma$ confidence level, in contradiction to Standard Model expectations. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
262 Belle Collaboration Improved measurement of $\bbar\to D_s^-D^+$ and search for $\bdsds$ at Belle We reconstruct $\bbar\to D_s^-D^+$ decays using a sample of $449\times 10^6$~$B\overline{B}$ pairs recorded by the Belle experiment, and measure the branching fraction to be ${\cal B}(\bbar\to D_s^-D^+)=\bigl[7.5\pm 0.2({\rm stat}) \pm 0.8({\rm syst})\pm 0.8({\rm {\cal B}'s})\bigr]\times 10^{-3}$. A search for the related decay $\bdsds$ is also performed. Since we observe no statistically significant signal an upper limit on the branching fraction is set at $3.6\times 10^{-5}$ (90\% C.L.). Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
263 Belle Collaboration Study of $B^0 \to \chi_{c1} \pi^0$ at Belle We report results of a search for the decay of the neutral $B$ meson into the final state $\chi_{c1} \pi^0$, a Cabibbo- and color-suppressed decay. The results are based on a large data sample of $B\overline B$ events collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
264 Belle Collaboration Study of $B^0 \to J/\psi \pi^+ \pi^-$ decays with 449 million We report a study of $B^0 \to J/\psi \pi^+ \pi^-$ decay with a data sample collected by the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The pion pair can be produced via resonances ($\rho^0, f_2$ etc.) as well as by a non-resonant process. We measured not only the total branching fraction but also the individual resonant contributions. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
265 Belle Collaboration Measurement of $CP$-violation parameters in $B^0 \to J/\psi \pi^0$ $CP$-violation parameters for neutral $B$ meson decays into the $J/\psi \pi^0$ final state are measured with a large sample of $\bar{B} B$ pairs recorded by the Belle detector at the KEKB $e^+ e^-$ energy asymmetric collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
266 Belle Collaboration Measurements of time-dependent $CP$ asymmetries in radiative $B^0$ Decays We present measurements of $CP$-violation parameters in radiative decays of $B^0$ using a large sample of $B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. $CP$-violation parameters are obtained from the asymmetries in the distributions of the proper-time intervals between the reconstructed $B$ and the accompanying $B$ meson. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
267 Belle Collaboration Measurements of time-dependent $CP$ asymmetries in hadronic penguin $B^0$ Decays We present measurements of $CP$-violation parameters in $b \to s q\bar{q}$ and $b \to d q\bar{q}$ decays using a large sample of $B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. $CP$-violation parameters are obtained from the asymmetries in the distributions of the proper-time intervals between the reconstructed $B$ and the accompanying $B$ meson. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
268 Belle Collaboration Measurement of $\phi_3$ from a Dalitz plot analysis of $B^+ \to D^{(*)} K^{(*)+}$ decay We present an updated measurement of the unitarity triangle angle $\phi_3$ using Dalitz plot analysis of three-body neutral $D$ decays from $B\to D^{(*)}K^{(*)}$ process. The results are based on a large sample of $B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
269 Belle Collaboration Study of the Suppressed Decays $B^- \to D^{(*)} K^{(*)-}$ at Belle We report studies of the suppressed decays $B^- \to D^{(*)}K^{(*)-}$. These modes play an important role in the extraction of the CKM angle $\phi_3$ (via the Atwood-Dunietz-Soni (ADS) method). A data sample recorded at the $\Upsilon$(4S) resonance by the Belle experiment at the KEKB asymmetric energy $e^+ e^-$ collider is used to give constraints on $\phi3$ and $r_B \equiv |A(B^- \to \bar{D^0}K^-)/ {A(B^-\to D^0K^-)|$. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
270 Belle Collaboration Improved Measurements of $B\to D_s K$ and $B\to D_s\pi$ Branching Fractions We report improved measurements of the $B\to D_s^{(*)} K$ and $B\to D_s^{(*)}\pi$ branching fractions. The results are based on a large data sample recorded at the $\Upsilon$(4S) resonance by the Belle experiment at the KEKB asymmetric energy $e^+ e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
271 Belle Collaboration Study of $B^+ \to D^{(*)+} \pi^0$ decay and the ratio of suppressed and favoured amplitudes in $B \to D^{(*)}\pi$ decays. We report results of a search for $B^+ \to D^{(*)+} \pi^0$ decay using a large data sample collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. We use the results to constrain the ratio of suppressed and favoured amplitudes in $B \rightarrow D^{(*)}\pi$ decays using the relation, $R_{D^{(*)}\pi} = \frac{2Br(B^+ \rightarrow D^{(*)+} \pi^0)} {Br(B^0 \rightarrow D^{(*)+} \pi^-)}$. This gives important information needed for the extraction of $\sin(2 \phi_1 +\phi_3)$ from time-dependent $B^0\to D^{(*)-}\pi^+$ decays. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
272 Belle Collaboration Study of $B^0 \to a_1^{\pm}\pi^{\mp}$ decays. We present a study of $B^0 \to a_1^{\pm}\pi^{\mp}$, which is a decay mode sensitive to the Cabibbo-Kobayashi-Maskawa weak phase angle $\phi_2$. The results are based on a large data sample collected with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
273 Belle Collaboration Measurements of the Branching Fractions of $B^0 \to \rho(770)^+\pi^-$, $\rho(770)^-\pi^+$, and $\rho(770)^0\pi^0$ Decays. We present a measurement of the branching fractions of $B^0 \to \rho(770)^+\pi^-$, $\rho(770)^-\pi^+$, and $\rho(770)^0\pi^0$ decays based on a 414/fb data sample containing 449M $B\overline{B}$ pairs collected by the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The results include the first measurement of the branching fractions of $B^0 \to \rho(770)\pi$ with the contributions from radial excitations, $\rho(1450)$ and $\rho(1700)$, removed using a Dalitz plot analysis. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
274 Belle Collaboration Search for the decay $B \to X(3872) K$ with $X(3872) \to D^{*0} \overline{D}^0. We report a search for $B \to X(3872) K$ with $X(3872)$ decaying to $D^{*0} \overline{D}^0 using a large sample of $B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. The study is performed separately for the $D^{*0} \to D^0 \gamma$ and $D^{*0} \to D^0 \pi^0$ decay modes. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
275 Belle Collaboration Search for the decays $B \to D_{sJ}(2536) D^{(*)}$. We report a search for $B \to D_{sJ}(2536) D^{(*)}$ with the $D_{sJ}(2536)$ decaying to $D^{*0} K^+$ and $D^{*+} K_S$. The study is performed using a large sample of $B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
276 Belle Collaboration Measurements of the branching fraction, polarization and $CP$ violation parameters for the decay $B^0 \to D^{*+} D^{*-}$. We report measurements of the branching fraction, polarization and $CP$-violation parameters for the decay $B^0 \to D^{*+}D^{*-}$. The results are based on a data collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
277 Belle Collaboration Study of the time-dependent decay rate of $B_s^0$ meson We report a study of the time-dependent decay rate of $B_s^0$ meson. The results are based on a 22 $fb^{-1}$ data collected at the $\Upsilon(5S)$ resonance with the Belle detector at the KEKB energy-asymmetric $e^+e^-$ collider. We measure the $B_s^0$ lifetime from the proper-time difference distribution of the two $B_s^0$ meson decays using exclusively reconstructed hadronic decays as well as dilepton events. The decay width difference for the two mass eigenstates of the $B_s^0$ -$\bar B_s^0$ system, $\Delta \Gamma_s / \Gamma_s$, appears in a term proportional to the $\cosh$ of the proper-time difference. In this analysis, we employ techniques similar to those established in measurements of the $CP$-violating parameters for $B_d^0$ decays. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
278 Belle Collaboration Search for $B_s \to \phi \gamma$ and $B_s \to \gamma\gamma$ at Belle We report on searches for $B_s \rightarrow \phi \gamma$ and $B_s \rightarrow \gamma \gamma$ decays using a 22 $fb^{-1}$ data sample recorded at the $\Upsilon(5S)$ resonance by the Belle detector at the KEKB $e^+e^-$ energy-asymmetric collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
279 Belle Collaboration Measurement of inclusive semileptonic $B_s \to X l \nu$ decay. The correlated production at the $\Upsilon$(5S) resonance of a $D_s$ meson and a lepton of the same sign is studied. The branching fraction for the inclusive decay $B_s \rightarrow X l \nu$ is measured for the first time. The analysis is based on a 22 $fb^{-1}$ data sample recorded at the $\Upsilon(5S)$ resonance with the Belle detector at the KEKB $e^+e^-$ energy-asymmetric collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
280 Belle Collaboration Measurement of branching fractions for $B_s^0\rightarrow J/\psi \phi$ and $B_s^0\rightarrow J/\psi K_s^0$ decays at $\Upsilon(5S)$ We measure the branching fractions for $B_s^0\rightarrow J/\psi \phi$ and $B_s^0\rightarrow J/\psi K_s^0$ decays using a 22 $fb^{-1}$ data sample collected on the $\Upsilon(5S)$ resonance by the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. The $J/\psi$ candidates are reconstructed from both $e^+e^-$ and $\mu^+\mu^-$ pairs; $\phi$ candidates are reconstructed from $K^+K^-$ pairs and $K_s^0$ candidates from $\pi^+\pi^-$ pairs. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
281 Belle Collaboration Search for $B\to f_{0} K^{*0}$ decay We report the results of a search for $B\to f_{0} K^{*0}$ decays. The results are based on a dataset collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider at the $\Upsilon(4S)$ resonance. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
282 Belle Collaboration Improved measurements of $B\to \rho\gamma$ and $B\to\omega\gamma$ We report the results of improved branching fraction measurements for $B^+\to \rho^+\gamma$, $B^0 \to \rho^0\gamma$ and $B^0 \to \omega\gamma$ using a large dataset collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We also measure the charge asymmetry of $B^+\to \rho^+\gamma$. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
283 Belle Collaboration Measurement of the Branching Fraction for $B\to\eta'K\gamma$ Decays We present a measurement of the branching fraction for $B \to\eta^{'} K \gamma$ decays based on a large data sample recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+e^-$ energy-asymmetric collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
284 Jacob Linacre for the CDF collaboration Measurement of the Top Quark Mass using the Matrix Element Analysis Technique in the Lepton + Jets Channel with In Situ W to jj Calibration We present a top quark mass measurement from ppbar collisions at 1.96 TeV at CDF. We use events from ppbar to ttbar in the lepton+jets channel requiring one charged lepton, high missing transverse energy and exactly 4 jets, at least one of which must be identified as a b-jet. The top quark mass is extracted with a 2D unbinned likelihood fit using per-event probabilities calculated using signal (ttbar) and background (W+jets) matrix elements. The probabilities are a function of both the top quark mass and the energy scale of the calorimeter jets (JES) which is measured in-situ by constraining the invariant mass of two hadronic jets to the W boson mass. High-Energy Electroweak Physics linacre@fnal.gov
285 Belle Collaboration Improved Measurement of the Differential Decay Rate for $B \to K^{(*)} \ell \ell$ Using a large data sample collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we present an improved measurement of the differential decay rate for $B \to K^{(*)} \ell \ell$. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
286 Belle Collaboration Study of $B^+\to p\bar{\Lambda} \gamma$, $B^+\to p \bar{\Lambda} \pi^0$ and $B^0\to p\bar{\Lambda} \pi^-$ We study the charmless baryonic three-body decays of $B$ mesons: $B^+ \to p\overline{\Lambda}\gamma$, $B^+ \to p\overline{\Lambda}\pi^0$ and $B^0 \to p\overline{\Lambda}\pi^-$. The partial branching fractions as a function of the baryon-antibaryon mass and the polar angle distributions of the proton in the baryon-antibaryon system are presented. These results are obtained from a large data sample that was collected near the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
287 Belle Collaboration Study of $B^+\to p\bar{p} K^+$ and $B^+\to p\bar{p} \pi^+$ We study the decays $B^+\to p\bar{p} K^+$ and $B^+\to p\bar{p} \pi^+$, especially for the polar angle distributions of the proton in the proton-antiproton helicity frame. This is useful for understanding the nature of the observed $M_{p\overline{p}}$ peaks near threshold. We also set upper limits on the branching fractions of the intermediate two-body decays, $\B^+ \to \Delta^{++} \bar{p}$ and $\B^+ \to p \bar{\Delta}{}^0$, for the $p\bar{p} \pi^+$ final state at the 90\% confidence level. These results are obtained from a large data sample that was collected near the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
288 Belle Collaboration Measurement of $B \to D_s^{(*)} K\pi$ branching fractions Exclusive $B$ meson decays to the final states $D_s^{(*)} K\pi$ are studied using a large data sample collected at the $\Upsilon(4S)$ resonance by the Belle dete ctor at KEKB. The branching fractions for $B^+\to D_s^-K^+\pi^+$ and $B^+\to D_s^{*-}K^\ +\pi^+$ are determined. A study of the two-body $D_sK$ and $D_s\pi$ subsystems is also performed. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
289 Belle Collaboration Search for $B$ decays to $B\to K^{(*)} \nu \bar{\nu}$ using one fully reconstructed $B$ meson We present a search for B decays to $B\to K^{(*)} \nu \bar{\nu}$ using one fully reconstructed B meson in the final state. This study is based on a large data sample recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB energy-asymmetric $e^{+}e^{-}$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
290 Belle Collaboration Measurement of the Photon Energy Spectrum of Inclusive Radiative B-meson Decays Using a large data sample of $\Upsilon(4S)$ decays to B-meson pairs, we measure the photon energy spectrum of inclusive radiative B-meson decays. We determine the partial branching fraction, mean and variance of the spectrum as a function of the lower threshold photon energy requirement. The results are based on a data sample collected by the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
291 Belle Collaboration Updated Measurement of the Branching Fraction for $B \to \phi K \gamma$ and Search for $B \to \omega K \gamma$ at Belle Updated branching fractions for $B \to \phi K \gamma$ are presented for the large dataset currently available with the Belle detector at the asymmetric-energy $e^+e^-$ collider KEKB. First results for the decay $B \to \omega K \gamma$ are also presented. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
292 Belle Collaboration Measurement of the Rare B Decay $B^0 \to \rho^0 \rho^0$ at Belle We present a measurement of $B^0 \to \rho^0 \rho^0$. This decay mode can help us to complete an isospin analysis of $B \to \rho \rho$, which provides a direct measurement of the CKM angle $\phi_2$. The results are based on a large data sample collected by the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
293 Belle Collaboration Measurement of the Branching Fraction and $X_s$ Mass Spectrum for Inclusive $B\to eta^{'} X_s$ Decays Using a large data sample of $B\bar{B}$ pairs collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we report a measurement of the branching fraction and $M(X_s)$ spectrum of the inclusive process $B\to X_s \eta^{'}$ with a semi-inclusive analysis method. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
294 Belle Collaboration Observation of $\bar{B}^0\to\D_s^+ \Lambda \bar{p}$ Decay We report the first observation of the decay $\bar{B}^0 \to D_s^+ \Lambda \bar{p}$ and a measurement of its branching fraction. This charmful baryonic B decay proceeds via a $b\to c \bar{u} d$ transition with popping of an $s \bar{s}$ quark pair from the vacuum. The data used for this analysis was recorded at the $\Upsilon(4S)$ resonance, using the Belle detector at the KEKB $e^+ e^-$ asymmetric-energy collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
295 Belle Collaboration Search for $B^0\to K^{*0} \omega$ Decays at Belle We present a search for $B \to K^{*0}\omega$ decays based on a large data sample recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+e^-$ energy-asymmetric collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
296 Belle Collaboration Search for $B^+ \to \rho^+ \omega$ at Belle We report the results of a search for the charmless decay $B^+ \to \rho^+ \omega$. The analysis is based on a large data sample recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+ e^-$ storage ring. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
297 Belle Collaboration Study of $B \to p \overline{p} K^*$ We study the $B \to p \overline{p} K^*$ decays of $B$ mesons. The branching fractions as well as the polar angular distributions of the proton in the baryon-antibaryon system are presented. This study is based on a large data sample recorded on the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
298 Belle Collaboration Determination of $|V_{cb}|$ and $m_b$ from inclusive semileptonic $B$~decays at Belle We present an analysis of the Belle measured moments of the lepton energy and hadronic mass spectra in B -> X_c l nu decays and the photon energy spectrum in B -> X_s gamma decays using theoretical expressions derived in two different frameworks. We determine the CKM matrix element $|V_{cb}|$, the $b$~quark mass and other non-perturbative parameters that appear in the description of inclusive $B$~decays. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
299 Belle Collaboration Determination of the Form Factors for the Decays $B^0\to D^{*-}\ell^+\nu$ and $ $B^0\to D^-\ell^+\nu$ and extraction of the CKM matrix element $|V_{cb}|$ at Belle We present a measurement of the form factors $\rho^2$, $R_1$, and $R_2$ ($\rho^2$), which describe the decay $B^0\to D^{*-}\ell^+\nu$ ($B^0\to D^-\ell^+\nu$) using fully reconstructed events. We also determine the rate normalization at zero recoil, which we use to extract the CKM matrix element $|V_{cb}|$. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
300 Belle Collaboration Search for $B\to D^{(*)}\tau\nu$~decays at Belle We report the results of a search for the decay $B\to D^{(*)}\tau\nu$. The analysis uses a large data sample collected at the $\Upsilon(4S)$~resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$~collider. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
301 Belle Collaboration Measurement of $B\to D^{**}\ell\nu$ at Belle We report measurements of the branching ratios of semileptonic $B$~decays to $P$-wave $D^{**}$~mesons at Belle. The result is obtained using the full reconstruction tagging method. This method gives both good separation of decay modes as well as background suppression. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
302 Belle Collaboration Measurements of Inclusive $B\to X_u\ell\nu$~decays and constrains on weak annihilation, using the full reconstruction tag at Belle We present measurements of the first and second moments of the $q^2$ and hadron mass distribution, and partial branching fraction of charmless semileptonic B decays. These results are obtained from a large data sample of $B\overline{B}$~pairs collected by the Belle detector at the KEKB $e^+e^-$~collider. Events are tagged by fully reconstructing one of the $B$~mesons. Multivariate machine learning techniques are used to distinguish the $b\to u$ semileptonic decay from the $b\to c$ semileptonic background. From these measurements we place a limit on the weak annihilation contribution to the $B\to X_u\ell\nu$~rate, and determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element, $|V_{ub}|$. Flavour Physics and CP Violation Yoshihide.Sakai@kek.jp
303 Belle Collaboration Improved measurement of CP-violating parameters in rho+rho- decays We present a measurement of the CP-violating asymmetry in rho+rho- decays using 535 million BBbar pairs collected with the Belle detector at the KEKB e+e- collider. We measure CP-violating coefficients A = 0.16 +- 0.21(stat) +- 0.07 (syst) and S = 0.19 +- 0.30(stat) +- 0.07 (syst}. These values are used to determine the unitarity triangle angle phi_2 using an isospin analysis; the solution consistent with Standard Model lies in the range 53 < phi_2 < 114 deg. at 90 C.L. Flavour Physics and CP Violation BELLE-CONF-0678 Yoshihide.Sakai@kek.jp
304 Belle Collaboration Measurement of EPR-type flavor entanglement in Y(4s)->B0B0bar decays The neutral B-meson pair produced at the Upsilon(4S) should exhibit a non-local correlation of the type discussed by Einstein, Podolski, and Rosen (EPR). We measure this correlation using the time-dependent flavour asymmetry of semileptonic B0 decays, which we compare with predictions from quantum mechanics and two local realistic models. The data are consistent with quantum mechanics, and inconsistent with the other models. Assuming that some B pairs disentangle to produce B0 and B0bar with definite flavour, we find a decoherent fraction of 0.029+-057, consistent with no decoherence. Flavour Physics and CP Violation BELLE-CONF-0678 Yoshihide.Sakai@kek.jp
305 Marcin Stolarski on behalf of COMPASS Collaboration COMPASS resutls based on spin longitudinal asymmetries New COMPASS results of spin longitudinal asymmetries obtained in inclusive and semi-inclusive inelastic scattering using polarized 160 GeV/c muon beam off deuteron target are presented. The data have been collected between 2002-2004. Measurements cover wide kinematical range: x from 0.00004 to 0.7 and Q^2 between 0.002-100 GeV^2/c^2. The statistical precision of the asymmetries, especially in the low x domain,is increased considerably compared to the previous experiments. The value of the first moment of g1(x) and the results of the QCD fits in the NLO approximation on all g1 deep inelastic data are shown. The evaluation of the polarized valence quark distribution, obtained from semi-inclusive data, is also presented. Strong Interactions Marcin.Stolarski@cern.ch
308 Stefan Antusch Neutrino Mixing Sum Rules We discuss the neutrino mixing sum rule $\theta_{12} - \theta_{13}\cos(\delta)\approx \theta^\nu_{12}$ which provides a possibility to explore the structure of the neutrino mass matrix in the presence of charged lepton corrections, since it relates the 1-2 mixing angle from the neutrino mass matrix, $\theta_{12}^\nu$, to observable parameters of the PMNS mixing matrix. The neutrino mixing sum rule holds if the charged lepton mixing angles are CKM-like, i.e., small and dominated by a 1-2 mixing, and for small 1-3 mixing in the neutrino mass matrix. These conditions hold in a wide class of well motivated flavour models. As explicit examples, we use the sum rule to test the hypotheses of tri-bimaximal and bimaximal neutrino mixing, where $\theta^\nu_{12}$ is predicted by $\sin^2(\theta^\nu_{12}) = 1/3$ or $1/2$. We confront the these hypotheses with present neutrino oscillation data and discuss the potential of future long-baseline reactor and accelerator experiments for testing predictions for $\theta^\nu_{12}$. Neutrino Physics antusch@delta.ft.uam.es
309 Stefan Antusch Flavour-Dependent Leptogenesis We discuss flavour-dependent effects in thermal leptogenesis, which are shown to have important consequences for the estimation of the produced baryon asymmetry in many cases of physical interest. For example, we analyse constraints on the parameters of the supersymmetric type-I seesaw mechanism from the requirement of successful thermal leptogenesis in the presence of upper bounds on the reheat temperature $T_\mathrm{RH}$ of the early Universe. To this end, we solve the flavour-dependent Boltzmann equations in the MSSM, extended to include reheating. We then discuss thermal leptogenesis in classes of neutrino mass models based on the seesaw mechanism with three right-handed neutrinos and sequential right-handed neutrino dominance. Within these classes of models we investigate constraints and expectations on the individual decay asymmetries and washout parameters from the present data on neutrino masses and mixings. We furthermore establish and analyze the link between the leptonic CP violating phase $\delta$, observable in neutrino oscillations, and the CP violation required for leptogenesis, where flavour-dependent effects have a significant effect. Astroparticle Physics, Gravitational Waves and Cosmology antusch@delta.ft.uam.es
310 A. Geiser and E. Nuncio-Quiroz, DESY and Hamburg University, Germany The FMNRxPYTHIA interface for heavy quark production at HERA A method to calculate heavy flavor visible-level cross sections at Next-to-Leading Order (NLO) in Quantum Chromodynamics (QCD), based on an interface of the FMNR program to PYTHIA, is described. It uses the NLO prediction at quark level provided by FMNR, applying a statistical reduction procedure (REDSTAT) that allows the link to PYTHIA 6.2, from where the description of the full hadron fragmentation and decay chain is obtained. The method is applied to ep -> bbbarX -> D* mu X and mu mu final states at HERA. Comparisons of the data and NLO cross sections at visible and b-quark level were found to be consistent and equivalent. Strong Interactions Achim.Geiser@desy.de
311 D. Berge on behalf of the ATLAS Trigger Configuration group The configuration system of the ATLAS Trigger The ATLAS detector at CERN's LHC will be exposed to proton-proton collisions at a rate of 40 MHz. To reduce the data rate, only potentially interesting events are selected by a three-level trigger system. The first level is implemented in custom-made electronics, reducing the data output rate to less than 100 kHz. The second and third trigger levels are realised in software with an output rate of 100-200 Hz. A system has been designed and implemented that hosts and records the configuration of all three trigger levels at a centrally maintained location. This system consistently provides configuration information to the online trigger for the purpose of data taking as well as to the offline trigger simulation. The use of relational database technology provides means of flexible information browsing, easy information distribution across the ATLAS reconstruction sites, and reliable recording of the trigger configuration history over the lifetime of the experiment. The functionality of this design has been demonstrated in dedicated configuration tests of the ATLAS level-1 central trigger and of a 600-node software trigger computing farm. We present an overview of the main system components, including a sophisticated, JAVA-based front-end to populate and maintain the configuration information, and report on the current status of the trigger configuration system. Detectors and Data Handling berge@cern.ch
312 Morgan Wascko (for the SciBooNE Collaboration) First Data from SciBooNE The SciBooNE experiment will measure muon neutrino and antineutrino cross sections on carbon near 1 GeV with unprecedented precision. SciBooNE uses the Booster Neutrino Beam at Fermilab and the SciBar vertex detector formerly used in the K2K experiment at KEK. SciBooNE will start its data run in antineutrino mode in June, 2007. Physics potential of the experiment and first data will be shown. Neutrino Physics m.wascko@imperial.ac.uk
313 D. Berge on behalf of the ATLAS first-level trigger community The ATLAS Level-1 Trigger: Status of the System and First Results from Cosmic-Ray Data The ATLAS detector at CERN's Large Hadron Collider will be exposed to proton-proton collisions from beams crossing at 40 MHz. A three-level trigger system was designed to select potentially interesting events and reduce the incoming rate to 100-200 Hz. The first trigger level (LVL1) is implemented in custom-built electronics. A trigger decision is made by the central-trigger processor yielding a LVL1 output rate of less than 100 kHz. The total allowed latency for the LVL1 decision is less than 2.5 microseconds. The decision is based on calorimeter information and hits in dedicated muon-trigger detectors. Installation of the final LVL1 trigger system at the ATLAS site is in full swing, to be completed later this year. We present an overview of the system and describe the current installation and commissioning status at the experimental site. Integration tests of the central-trigger processor with the calorimeter and muon systems and the level-2 trigger have been successfully performed. Cosmic-ray data have been recorded in situ exercising the full trigger chain, using the central trigger to initiate the read-out of sub-detectors. These data are used for consistency checks of the full hardware and software chain. We show the analysis results and verify, where possible, that the LVL1 trigger meets the requirements and will be ready for data taking. Detectors and Data Handling berge@cern.ch
314 Achim Geiser, DESY Hamburg Prediction m_H = 2M_W, fermion mass relations and electroweak physics at LHC The Standard Model Higgs Yukawa couplings are reexamined in the context of a composite model. The Higgs mass is predicted to be twice the W mass, M_H = 2M_W. Mass relations to and between the Standard Model fermions can also be obtained. Observable consequences for electroweak physics at LHC are discussed. High-Energy Electroweak Physics "Could also be interesting for the Beyond the Standard Model session, although observable effects are essentially within the Standard Model." Achim.Geiser@desy.de
315 Ekaterina Fadeeva, 6-m MIS ITEP Collaboration, Institute of Theoretical and Experimental Physics, Moscow, Russia Investigation of Narrow Resonance at 1450 MeV in the System of Two K_S Mesons Results are presented that were obtained by studying narrow resonance of mass about 1450 MeV. The system of two K_S-mesons has been analyzed in the mass interval 1300-1600 MeV. The experimental data subjected to the analysis come from 6-m spectrometer created at the Institute of Theoretical and Experimental Physics (ITEP, Moscow) and irradiated with a 40-GeV beam of negatively charged pions from U-70 accelerator at the Institute for High Energy Physics (IHEP, Serpukhov). The use of a neutral trigger in the experiment being reported made it possible to suppress both charged particles and photons. The statistical confidence of the observer maximum is better than 6 standard deviation. The mass and width of the observed meson are M=1453±4 MeV and Г=13±5 MeV, respectively. Seeing its very narrow width this resonance is likely to be exotic meson. Strong Interactions fadeeva@itep.ru
316 The ATLAS Liquid Argon Calorimeter Group. The ATLAS Liquid Argon Calorimeter: Construction, Integration and Commissioning. The ATLAS liquid argon (LAr) calorimeter system consists of an electromagnetic barrel calorimeter and two end-caps with electromagnetic, hadronic and forward calorimeters. The liquid argon sampling technique, with an accordion geometry was chosen for the barrel electromagnetic calorimeter (EMB) and adapted to the end-cap (EMEC). The hadronic end-cap calorimeter (HEC) is using a copper-liquid argon sampling technique with flat plate geometry and is subdivided into two wheels in depth per end-cap. Finally, the forward calorimeter (FCAL) is composed of three modules featuring cylindrical electrodes with thin liquid argon gaps. The construction of the full calorimeter system is completed since mid-2004. Production modules constructed in institutes were assembled at CERN in 2003-2004 and inserted into the barrel and end-cap cryostats. The integration into the three cryostats was finished in 2004. Each of the cryostats was then cooled down to 87 K, filled with LAr and cold tested on the surface before its installation in the ATLAS underground cavern. Besides functional tests of the read-out electronics, the calibration system and the HV lines, measurements of capacitance, inductance and resistance of each of the 180.000 calorimeter cells as well as reflectrometry tests have been performed. Results from this cold commissioning on the surface will be presented demonstrating the excellent condition of the ATLAS LAr calorimeter system after its integration into cryostats, with more than 99,9% of the system working according to requirements. The last of the three cryostats was installed inside the ATLAS hadronic tile calorimeter wheels in the ATLAS underground cavern in April 2006. Since then the electronics read-out system has been installed and tested. In the presentation the status of the electronics installation will be discussed and test results will be shown. Electronics calibration is recorded in all calorimeters using the final ATLAS readout. Online software and monitoring tools have been developed as well as offline signal reconstruction. The signal reconstruction is one of the key points of the uniformity of the calorimeter response. The performance of the whole electronics chain (noise, stability, linearity etc) will be presented. The barrel cryostat is since autumn 2006 filled with LAr and one of the end cap cryostats has recently been filled. In order to verify the quality of the reconstruction methods, cosmic muon data has been recorded together with the hadronic Tile calorimeter. First results of this combined cosmic muon run inside the ATLAS cavern will be presented. Detectors and Data Handling "Abstract submitted by the LARG conference committee, speaker to be nominated later. Contacts: lund@particle.kth.se, martin.aleksa@cern.ch, hma@bnl.gov" lund@particle.kth.se
317 Carmine Pagliarone, Arturo Fernandez-Tellez Cosmic Ray Physics with ACORDE at LHC ACORDE, the ALICE COsmic Ray DEtector is one of the ALICE detectors, presently under construction at LHC. It consists of an array of plastic scintillator counters placed on the three upper faces of the ALICE magnet. This array will act as Level 0 cosmic ray trigger and, together with other ALICE sub-detectors, will provide precise information on cosmic rays with primary energies around $10^{15-17}$ eV. In this paper we will describe the ACORDE detector, trigger design and electronics focusing on the Cosmic Ray physics program that it will be possible to explore both with ACORDE both with an extended Cosmic Rays array at LHC. Astroparticle Physics, Gravitational Waves and Cosmology It concern also Detectors and Data Handling. pagliarone@fnal.gov
318 The ATLAS Liquid Argon Calorimeter Group Results from the ATLAS Combined Test Beams Beam tests of combinations of ATLAS calorimeters have been performed both for the barrel and end cap parts. During a combined test beam in summer 2004 a slice of the ATLAS barrel detector - including all detector sub systems from the inner tracker, the calorimetry to the muon system - was exposed to particle beams (electrons, pions, photons, muons) with different energies (1GeV to 350GeV). The aim was to study the combined performance of the different detector sub systems in ATLAS-like conditions. We will present the electronics calibration scheme of the electromagnetic calorimeter and its implementation. The following studies on the combined testbeam data have been performed and will be presented: performance of the electromagnetic calorimetry down to very low energies (> GeV), photon reconstruction including converted photons and position measurements using the very precise ATLAS tracker and the electromagnetic calorimeter. These measurements have been compared to Monte Carlo simulations showing the good description of the data. An end cap segment of the electromagnetic, hadronic and forward liquid argon calorimeters of ATLAS has been exposed to electron, pion and muon beams in the energy range from 10 to 200 GeV. The goal of this beamtest carried out at the CERN SPS is to obtain the calibration for the ATLAS calorimeter in a particular difficult transition region (2.4 Detectors and Data Handling "Abstract submitted by the LARG conference committee, speaker to be nominated later. Contacts: lund@particle.kth.se, martin.aleksa@cern.ch, hma@bnl.gov " Bengt.Lund-Jensen@cern.ch
319 Frank Simon (for the STAR collaboration) The STAR Tracking Upgrade Program The STAR collaboration is preparing a challenging tracking detector upgrade program using novel detector concepts. The purpose of the tracking upgrade is to investigate fundamental properties of the new state of strongly interacting matter produced in relativistic-heavy ion collisions at RHIC and to provide fundamental studies of the nucleon spin structure and dynamics in polarized proton-proton collisions at both 200 GeV and 500 GeV at RHIC. At mid-rapidity, |y|<=1.2, the upgrade is the combination of active pixel sensors close to the collision point and silicon strip technology further outward while in the forward rapidity, 1.0 < y < 2.0, a system of six triple-GEM disks using Tech-Etch produced GEM foils is currently under development. We will report on the current status of the design efforts and on results from the technology development. Detectors and Data Handling fsimon@mit.edu
320 A. Hoecker, J. Stelzer, F. Tegenfeldt, H. Voss TMVA - Multivariate Data Mining in Physics Analysis In high-energy physics, with the search for ever smaller signals in ever larger data sets, it has become essential to extract a maximum of the available information from the data. Multivariate classification methods based on machine learning techniques have become a fundamental ingredient to most analyses. Also the multivariate classifiers themselves have significantly evolved in recent years. Statisticians have found new ways to tune and to combine classifiers to further gain in performance. Integrated into the analysis framework ROOT, TMVA is a toolkit which holds a large variety of multivariate classification algorithms. They range from rectangular cut optimization using a genetic algorithm and from likelihood estimators, over linear discriminants and non-linear neural networks, to sophisticated more recent classifiers such as boosted decision trees, rule ensemble fitting and a support vector machine. TMVA manages the simultaneous training, testing, and performance evaluation of all these classifiers with a user-friendly interface, and expedites the application of the trained classifiers to data. Detectors and Data Handling andreas.hoecker@cern.ch
321 Silvia Pascoli Leptogenesis and low energy CP-violation It was commonly thought that the observation of low energy leptonic CP-violating phases would not automatically imply the existence of a baryon asymmetry in the leptogenesis scenario. This conclusion does not generically hold when the issue of flavour is relevant and properly taken into account in leptogenesis. I will illustrate this point from the theoretical point of view and with examples. Neutrino Physics silvia.pascoli@durham.ac.uk
322 Jon M. Butterworth, John R. Ellis, Are R. Raklev Reconstructing Sparticle Mass Spectra using Hadronic Decays Most sparticle decay cascades envisaged at the Large Hadron Collider (LHC) involve hadronic decays of intermediate particles. We use state-of-the art techniques based on the \kt jet algorithm to reconstruct the resulting hadronic final states for simulated LHC events in a number of benchmark supersymmetric scenarios. In particular, we show that a general method of selecting preferentially boosted massive particles such as W, Z or Higgs bosons decaying to jets, using sub-jets found by the \kt algorithm, suppresses QCD backgrounds and thereby enhances the observability of signals that would otherwise be indistinct. Consequently, measurements of the supersymmetric mass spectrum at the per-cent level can be obtained from cascades including the hadronic decays of such massive intermediate bosons. Physics Beyond the Standard Model See arXiv:hep-ph/0702150 Are.Raklev@cern.ch
323 Sergio Palomares-Ruiz TeV gamma-rays and neutrinos from photodissociation of cosmic-ray nuclei in Cygnus OB2 It is commonly assumed that high-energy gamma-rays are made via either purely electromagnetic processes or the hadronic process of pion production, followed by decay. We investigate astrophysical contexts where a third process may dominate, namely the photodissociation of highly boosted nuclei followed by daughter de-excitation. This process is proposed as a candidate explanation of the recently discovered HEGRA source at the edge of the Cygnus OB2 association. The Lyman-alpha background is provided by the rich O and B stellar environment. It is found that (1) the HEGRA flux can be obtained if there is efficient acceleration at the source of lower energy nuclei; (2) a strong suppression of the gamma-ray spectrum compared to an Egamma^{-2} behavior is predicted at energies ~ 1 TeV (some of these energies will be probed by the upcoming GLAST mission); (3) a TeV neutrino counterpart from neutron decay following helium photo-disintegration will be observed at IceCube only if a major proportion of the kinetic energy budget of the Cygnus OB2 association is expended in accelerating nuclei. This mechanism offers an important contribution to gamma-ray astronomy in the era of intense observational activity. Astroparticle Physics, Gravitational Waves and Cosmology sergio.palomares-ruiz@durham.ac.uk
324 heLiCal Collaboration Spin tracking at the ILC Polarized electron and positron beams are foreseen for the future International Linear Collider (ILC), with polarized electrons already included in the baseline design and polarized positrons seen as a highly-desirable upgrade. High precision physics requires the polarization of both beams to be known with a relative uncertainty of approximately 0.5% or better. Therefore all possible depolarization effects that could operate between the polarized sources and the interaction regions have to be carefully modelled. The "heLiCal" collaboration aims to provide a full "cradle-to-grave" analysis of all depolarization effects at the ILC, and to develop software tools to carry out appropriate computer simulations. In this paper we report on the first phase of our work which includes extensive simulations of the ILC spin-dynamics and a detailed study of beam-beam depolarization effects at the interaction point(s). Accelerator RD and Technology g.a.moortgat-pick@durham.ac.uk
325 heLiCal Collaboration Polarised positron source at the ILC The positron source for the International Linear Collider is a helical undulator-based design, which can generate unprecedented quantities of polarised positrons. The heLiCal collaboration takes responsibility for the design and prototyping of the superconducting helical undulator, which is a highly demanding short period device with very small aperture, and also leads the start to end simulations of the polarised electrons and positrons to ensure that the high polarisation levels generated survive from the source up to the collision point. This paper will provide an update on the work of the collaboration, focusing on these two topic areas, and will also discuss future plans. Accelerator RD and Technology g.a.moortgat-pick@durham.ac.uk
326 E166 Collaboration Undulator-based production of polarized positrons In the baseline design for the ILC, the undulator-based scheme is used as positron source. Such scheme has excellent prospects to achieve the high luminosity demands. In addition it opens an easy path to provide even polarized positrons which is important for the physics program at the ILC. The E166 experiment has tested this scheme in the FFTB at Slac. The experiment was carried out with a one meter long, short-period, pulsed helical undulator. A low emittance 46.6 GeV electron beam passing through this undulator generated circularly polarized photons with energies in the range of 8 MeV. They were converted in a relatively thin target to generate longitudinally polarized positrons. The resulting positron polarization has been measured at different energies of positrons and is in agreement with the expectations. Accelerator RD and Technology g.a.moortgat-pick@durham.ac.uk
327 The CKMFitter Group The CKM Matrix Global Fit and A model-independent analysis of New Physics contributions in $\Delta F=2$ transi An up-to-date profile of the Cabibbo-Kobayashi-Maskawa matrix will be given, with emphasis on the interpretation of recent results on CP violation from the B factories and recent measurements in B physics from the Tevatron. We will review the relevant experimental and theoretical inputs to the CKM matrix global fit and give numerical and graphical constraints on the CKM parameters. Predictions of related physical observables will also be presented. The Standard Model (SM) describes with a great success so far, the data in the flavor sector. It is hence important to quantitatively explore how far the present experiments are constraining potential New Physics (NP) contributions. The NP effects in the $B^0-\bar B^0$ mixing amplitude can be model-independently accounted for by introducing only two parameters. The constraints on these parameters issued from the most recent $B$ transition data will be presented. Flavour Physics and CP Violation Stephane.Monteil@in2p3.fr
328 Gudrid Moortgat-Pick The role of polarized positrons and electrons in revealing fundamental interactions at the linear collider The proposed International Linear Collider (ILC) is well-suited for discovering physics beyond the Standard Model and for precisely unraveling the structure of the underlying physics. The physics return can be maximized by the use of polarized beams. This report shows the paramount role of polarized beams and summarizes the benefits obtained from polarizing the positron beam, as well as the electron beam. The physics case for this option is illustrated explicitly by analyzing reference reactions in different physics scenarios. The results show that positron polarization, combined with the clean experimental environment provided by the linear collider, allows to improve strongly the potential of searches for new particles and the identification of their dynamics, which opens the road to resolve shortcomings of the Standard Model. Physics Beyond the Standard Model g.a.moortgat-pick@durham.ac.uk
329 Gudrid Moortgat-Pick Combined LHC/ILC analysis of a SUSY scenario with heavy sfermions We discuss the potential of analyses at the Large Hadron Collider and the planned International Linear Collider to explore low-energy supersymmetry in a difficult region of the parameter space characterized by masses of the scalar SUSY particles around 2~TeV. Precision analyses of cross sections for light chargino production and forward--backward asymmetries of decay leptons and hadrons at the ILC with sqrt{s}=500~GeV, together with mass information on tilde{chi}^0_2 and squarks from the LHC, allow us to determine the underlying fundamental gaugino/higgsino MSSM parameters, to constrain the masses of the heavy, kinematically inaccessible sparticles and to outline the needed higher energy scale for the second stage of the ILC. No assumptions on a specific SUSY-breaking mechanism are imposed. Physics Beyond the Standard Model g.a.moortgat-pick@durham.ac.uk
330 Gudrid Moortgat-Pick Triple product correlations for revealing CP-violating effects in supersymmetric processes at LHC and ILC CP-violating effects in production and decay of supersymmetric particles are studied. The CP sensitive asymmetries by means of triple product correlations are exploited and their dependence on the complex parameters M_1 and \mu are analysed. Numerical predictions for the asymmetries and their measurability at the LHC and the future International Linear Collider are given. Our results show that the CP asymmetries can be measured with good statistical significances in a large region of the parameter space of the Minimal Supersymmetric Standard Model. Physics Beyond the Standard Model g.a.moortgat-pick@durham.ac.uk
331 Veronique Boisvert, Kevin McFarland, Veronica Sorin, Kirsten Tollefson, Zeynep Gunay Unalan, Yen-Chu Chen, Andy Beretvas, Jaroslav Antos, Stanislav Tokar , Peter Bednar CDF top charge measurement Since top quark's discovery in 1995, there have been several measurements of the top quark's mass and cross section. Due to this quark's special role in electroweak symmetry breaking, other parameters such as its charge and spin should also be measured. We present the first CDF measurement of the top quark's charge using its decay products from a sample of 1.2 fb$^{-1}$ of data collected with the CDFII detector at the Tevatron collider at Fermilab. The standard model predicts the top quark charge to be +2/3 but alternative theories allow a fourth generation exotic quark with a charge of -4/3. We classify events as either top-like or exotic-like depending on the the charge of the b jet and of the associated W boson. We report confidence level limits for the data to exclude the exotic or standard model hypothesis. High-Energy Electroweak Physics pbednar@fnal.gov
332 H. Fraas, F. Franke, S. Hesselbach, G. Moortgat-Pick Distinguishing between MSSM and NMSSM by combined LHC and ILC analyses We show that the interplay between the LHC and the ILC with sqrt{s}=500 GeV might be crucial for the discrimination between the minimal and next-to-minimal supersymmetric standard model. We present a NMSSM scenario that cannot be distinguished from the MSSM by cross sections and mass measurements if only the light neutralinos and the lightest chargino are kinematically accessible, even if one of the neutralinos has a significant singlino component. Mass predictions for the heavier neutralinos from the ILC analysis and their observation at the LHC lead to an identification of the neutralino mixing character and the underlying supersymmetric model in a combined LHC/ILC analysis. In our numerical example we include uncertainties in the mass measurements and use standard methods of supersymmetric parameter determination. Physics Beyond the Standard Model g.a.moortgat-pick@durham.ac.uk
333 CLEO Collaboration Dipion transitions in bottomonium at CLEO The CLEO experiment has collected roughly 6 million Y(3S) and 9 million Y(2S) decays. We report results from studies of both charged and neutral two-pion transitions: Y(3S) --> Y(2S) pi pi, Y(3S) --> Y(1S) pi pi and Y(2S) --> Y(1S) pi pi, with both exclusive and inclusive decays of the final state Upsilon. Using the two-dimensional space of two-pion invariant mass and pion decay angle, we report branching ratios for these transitions, and determinations of their decay matrix elements. Strong Interactions cleoac@mail.lepp.cornell.edu
334 CLEO Collaboration Experimental Studies of rare transitions and decays in the Upsilon family at CLEO The CLEO III detector has accumulated a sample of about 9 million Upsilon(2S) and 6 million Upsilon(3S) decays. These can undergo electric dipole transitions to the triplet-P states chi(b) and chi'(b), and suppressed magnetic dipole transitions to the singlet-S state eta(b), which has never been observed. Exclusive decays of the chi(b) and chi'(b) states are examined with the aim of sharpening searches for the eta(b). The same data are also examined for evidence for the hadronic transitions Upsilon(2S) -> eta Upsilon(1S) and Upsilon(3S) --> eta Upsilon(1S), using decays eta -> gamma gamma, eta -> pi+ pi- pi0, and eta -> pi+ pi- gamma, and identifying the Upsilon(1S) by its decay into e+ e- or mu+ mu-. Strong Interactions cleoac@mail.lepp.cornell.edu
335 CLEO Collaboration Exclusive radiative Upsilon decays at CLEO We report on the study of exclusive radiative decays of the Upsilon(1S) resonance into the all neutral final states gamma-pi0pi0, gamma-pi0eta, gamma-etaeta, gamma-eta and gamma-etaprime, using 1.13 fb-1 of e+e- annihilation data taken with the CLEO III detector operating at the Cornell Electron Storage Ring. In the gamma-pi0pi0 channel we measure the branching ration for the mode Upsilon(1S) -> gamma f_2(1270) to be (10.5+-1.6+1.9-1.8) x 10^-5. We find no significant signals in the other modes, and place upper limits on them. Our upper limits on exclusive radiative decays to eta and etaprime provide discrimination between models of radiative decays of charmonia. Strong Interactions cleoac@mail.lepp.cornell.edu
336 CLEO Collaboration Search for the 1S_0 (eta_b) ground state of bottomonium at CLEO A search for the long missing eta_b(1S) ground state of the bottomonium system is being made at CLEO using the 21 million Upsilon (1S) produced in e+e- annihilations at CESR. The reaction studied is Upsilon(1S) -> gamma eta_b, eta_b -> hadrons. Events with hadron multiplicities of 4, 6, 8, and 10 are identified. Preliminary results will be presented. Strong Interactions cleoac@mail.lepp.cornell.edu
337 CLEO Collaboration Studies of fragmentation and particle yields in the Upsilon family at CLEO The CLEO III detector has accumulated a sample of about 21 million Upsilon(1S), 9 million Upsilon(2S) and 6 million Upsilon(3S) decays. We present final results on a variety of fragmentation and decay analyses: (i) open charm production in both Upsilon(nS) and chi_b decays; (ii) comparisons of qqbar and gg fragmentation to heavy mesons and baryons, both from comparison of radiative Upsilon(nS) decays to ISR continuum events and from comparison of chi_b1 or chi_b2 decays to those of chi_b1; (iii) limits on narrow resonance production in radiative Upsilon(nS) decays over a wide range of masses; and (iv) the yield of anti-deuterons in Upsilon(1S) decays. Strong Interactions cleoac@mail.lepp.cornell.edu
338 CLEO Collaboration Search for invisible and lepton flavor violating decays of Upsilon at CLEO Using more than 1 fb-1 data collected on each of the Upsilon(1S,2S,3S) resonances, CLEO made two searches for new physics scenarios beyond the Standard Model: (i) for Upsilon(1S) resonance decays to weakly interacting particles which cannot be observed in the detector (as a possible indication of coupling between the Standard Model and the dark matter sector); (ii) sfor lepton flavor violating (LFV) decay Upsilon(1S,2S,3S) -> mu+ tau-. The measurement of invisible decay of the Upsilon(1S) was performed using the Upsilon(2S) -> pi+ pi- Upsilon(1S) transition and inferring the presence of the Y(1S) from the missing mass recoiling against the pi+pi- in the event. After taking backgrounds into account, no significant signal is observed and a 90% C.L. upper limit B[Upsilon(1S) -> invisible] < 0.39% is obtained. In the LFV analysis, we identify the tau through its electron decay and utilize multi-dimensional likelihood fitting with PDF shapes determined from independent data samples. We present 95%CL upper limits on LFV branching fractions of the Upsilons and interpret our results in terms of an exclusion plot on energy scale and coupling of a BSM interaction in the framework of effective field theory. Physics Beyond the Standard Model cleoac@mail.lepp.cornell.edu
339 CLEO Collaboration chicJ properties at CLEO (group abstract) Using 26 Million psi(2S) decays we will present improved chi_c measured widths and also present measured branching fractions of chic to various final states, including two pseudoscalar mesons, two vectors, and baryon-antibaryon pairs. Strong Interactions cleoac@mail.lepp.cornell.edu
340 CLEO Collaboration eta_c(1S) and eta_c(2S) analyses at CLEO (group abstract) Based on the 26 million psi(2S) decays collected with the CLEO-c detector, we present preliminary results of analyses investigating eta_c and eta_c(2S) properties. Strong Interactions cleoac@mail.lepp.cornell.edu
341 CLEO Collaboration Study of h_c decays at CLEO (group abstract) Recently CLEO reported the identification of the elusive 1P1 (h_c) state of charmonium via a study of the reaction psi' -> pi0 h_c, h_c -> gamma eta_c. The then available data for 3 million psi' were used to obtain resonance parameters whose precision was limited by statistics. Additional data were recently taken by CLEO-c, and a total sample of 26 million psi' have now been analyzed. Preliminary results of the above reaction as well as hadronic decays of h_c will be presented. Strong Interactions cleoac@mail.lepp.cornell.edu
342 CLEO Collaboration A Precision Determination of D0 Mass at CLEO A precision measurement of the D0 meson mass has been made using 281 pb-1 of e+e- annihilation data taken with the CLEO-c detector at the psi(3770) resonance. The exclusive decay D0 -> K0Sphi has been used to obtain M(D0) = 1864.847 +- 0.150 (stat.) +- 0.095 (syst.) MeV. This corresponds to M(D0D*0bar) = 3871.81 +- 0.36 MeV and leads to a well-constrained determination of the binding energy of the proposed |D0D*0bar> molecule X(3872), as E_b = 0.6 +- 0.6 MeV. Strong Interactions This may also be of interest to the Flavor Physics section. cleoac@mail.lepp.cornell.edu
343 CLEO Collaboration Absolute D(s) Hadronic Branching Fraction Measurements at CLEO Measurements of the absolute branching fractions of D mesons to reference hadronic final states normalize many measurements in charm and bottom physics. Using large samples of D0 D0bar, D+ D-, and Ds Ds* events collected by the CLEO-c experiment at the CESR e+ e- collider, we obtain precise measurements of the branching fractions of key decay modes, including D0->K pi, D+ -> K pi pi, and Ds+ -> K K pi. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
344 CLEO Collaboration Decays of D mesons to final states containing eta and etaprime at CLEO We present new measurements of singly and doubly Cabibbo-suppressed decays of $D$ mesons into final states containing eta and etaprime mesons from CLEO-c. The study of these final states provides additional information on SU(3) symmetry breaking and final state interaction effects in D meson decays. We also present inclusive branching fractions D,Ds --> eta/eta'/phi + X. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
345 CLEO Collaboration Comparison of D --> K0SPi and D --> K0LPi Decay Rates at CLEO We present measurements of D --> K0_S pi and D --> K0_L pi branching fractions using 281 pb^{-1} of psi(3770) data at the CLEO-c experiment. We find that BF(D0 --> Kspi0) is larger than BF(D0 --> Klpi0), and for BF(D^+ --> Kspi^+) and BF(D^+ --> Klpi^+) we observe no measurable difference. The asymmetry in the D0 branching fractions is consistent with the value based on the U-spin prediction A(D0 --> K0 pi0)/A(D0 --> bar K0 pi0) = -tan2 theta_C, where theta_C is the Cabibbo angle. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
346 CLEO Collaboration Search for CP Violation in the D+- -> K+K- pi+- Dalitz Plot at CLEO We report on a search for a CP asymmetry in the singly Cabibbo-suppressed decay D+ -> K+ K- pi+ using a data sample of 281 pb-1 accumulated with the CLEO-c detector on the psi(3770) resonance. We have searched for CP asymmetries in a Dalizt plot based analysis that also determines the amplitudes and relative phases of the intermediate states. Furthermore, limits are obtained from specific mass interval. The CP asymmetries are measured to be consistent with zero. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
347 CLEO Collaboration Constraining gamma/phi_3 with a Model-Independent Dalitz Plot Analysis of CP-Tagged and Flavor-Tagged D->K0Spi+pi- and K0Lpi+pi- at CLEO Precision determination of the CKM angle \gamma/\phi_3 depends upon constraints on charm mixing amplitudes, measurements of doubly-Cabibbo suppressed amplitudes and relative phases, and studies of charm Dalitz plots tagged by flavor or CP eigenstates. We describe the selection criteria for the tagged KSpipi and KLpipi samples, the technique to constrain the Dalitz model uncertainty, and the CLEO-c impact on \gamma/\phi_3 measurements at B-factories. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
348 CLEO Collaboration Study of Charm Mixing and Strong Phases Using Quantum Correlations at CLEO We exploit the quantum coherence between pair-produced D0 and D0bar in psi(3770) decays to study charm mixing and to make a first measurement of the relative strong phase delta between D0 to K- pi+ and D0bar to K- pi+. Using 281 pb^-1 collected with the CLEO-c detector at E_cm = 3773 MeV, we measure y * cos delta, and we perform an average with other available measurements. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
349 CLEO Collaboration Dalitz analyses of the D+ --> pi- pi+ pi+ and D+ --> K- pi+ pi+ decays Using 0.78M e+e- --> psi(3770) --> D+ D- events produced by the Cornell Electron Staorage Ring (CESR) and observed by the CLEO-c detector, we perform a Dalitz plot analysis of D+ --> pi- pi+ pi+ and D+ --> K- pi+ pi+ decays. Due to the different sizes of the event sample, 7K and 67K, and background fractions, 30% and 1%, respectively, we apply different strategy in these two analyses. For the D+ --> pi- pi+ pi+ decay we use an isobar model with three alternative models of the pi- pi+ S-wave parameterization. For the D+ --> K- pi+ pi+$ decay, a quasi-model-independent approach is used. We present results on the model parameters and the fit fractions of intermediate states. Our results confirm the conclusions of the previous high statistics experiments, E791 and FOCUS, on the dominant contribution of the low-mass (pi- pi+) and (K- pi+) S-waves in these decays. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
350 CLEO Collaboration Suppressed and Forbidden Decays of Ds+ Mesons to Two Pseudoscalar Mesons at CLEO Using the data collected near the Ds*+ Ds- peak production energy by the CLEO-c detector we study the decays of Ds+ mesons to two pseudoscalar mesons. We report searches for the singly-Cabibbo-suppressed Ds+ decay modes K+ eta, K+ eta', pi+ K0S, K+ pi0, and the forbidden decay mode Ds+ --> pi+ pi0. We normalize against the Cabibbo-favored Ds+ modes, pi+ eta, pi+ eta', and K+ K0_S. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
351 CLEO Collaboration Hadronic cross-sections around 4GeV as well as between 7 and 10 GeV at CLEO Using the CLEO-c detector at the CESR storage ring, we have measured inclusive and exclusive cross sections for the production of D+, D0 and Ds+ mesons in e-e- annihilations at thirteen center-of-mass energies between 3.97 and 4.26 GeV. Exclusive cross sections are presented for final states consisting of two charmed mesons (D Dbar, D* Dbar, D* D*bar, Ds+ Ds-, Ds*+ Ds-, and Ds*+ Ds*-), and for ``multi-body'' processes in which the charmed mesons are accompanied by a pion. No enhancement in any final state is observed at the energy of the recently discovered Y(4260). We complement this analysis with a measurement of R at 7-10GeV. Strong Interactions cleoac@mail.lepp.cornell.edu
352 CLEO Collaboration Measurement of B(Ds+ --> ell+nu) and B(D+ --> ell+nu) and the Decay Constants f_Ds+ and f_D+ Using the decays D --> mu nu and Ds --> mu(tau) nu and the CLEO-c detector, we have made incisive measurements of the decay constants f_D and f_Ds . These are prime tests of QCD calculations related to heavy quark decays. We examine e+e- --> Ds-Ds{*+} and Ds*- Ds+ interactions at 4170 MeV in order to measure the decay constant f_Ds+. We use the Ds+ --> ell+nu channel, where the ell+ designates either a mu+ or a tau+, when the tau+ --> pi+ nubar. We also examine D Dbar pairs produced at a center of mass energy of 3770 MeV in order to study D to mu nu. Flavour Physics and CP Violation This abstract may be of interest to the Electroweak Physics session also. cleoac@mail.lepp.cornell.edu
353 CLEO Collaboration D --> pi/K e nu at CLEO Using a 281 pb^{-1} data sample collected with the CLEO-c detector at the psi(3770) resonance, we study the decay D --> pi,K e nu. We pursue two avenues: (1) We identify events where one D meson has decayed to a hadronic final state and the other D meson has decayed to a semileptonic final state, (2) we reconstruct the neutrino 4-vector via the missing energy and momentum in the event, making use of the hermeticity of the detector, but do not impose any requirements on the decay of the second D. We present measurements of the absolute semileptonic branching ratios and differential decay rates for D --> K e nu_e and D --> pi e nu_e. The decay rates are fit to several form factors models and results are compared to theory. Using |V_{cq}| obtained from the unitarity constraints of the CKM matrix, form factors f_+(q2) are measured and used to test unquenched LQCD predictions. Using LQCD calculations of f_+(0), we present direct measurements of V_{cs} and V_{cd}. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
354 CLEO Collaboration D --> vector l nu form factors at CLEO Using a 281/pb data sample collected with the CLEO-c detector at the psi(3770) resonance, we present improved measurements of absolute branching fractions in the semileptonic decays D0 --> rho- e+ nu_e and D+ --> rho0 e+ nu_e. By performing a four-dimensional maximum likelihood fit to the distribution of kinematic variables, we have measured, for the first time, the semileptonic form factor ratios R_V and R_2 in D0 --> rho- e+ nu_e and D+ --> rho0 e+ nu_e. Using our measurements of absolute branching fractions and form factor ratios, world averages for D0 and D+ lifetimes and the value of V_{rm cd} obtained from the CKM matrix unitarity constraints, we determine absolute normalizations of form factors A_1(0), A_2(0) and V(0). Model-independent form factor measurements by CLEO of the vector final state D --> K* e nu are already published. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
355 CLEO Collaboration Rare D semileptonic modes at CLEO Using a 281/pb data sample collected at the psi(3770) resonance with the CLEO-c detector, we present results of searches for rare semileptonic D meson decays. Our results include the first observation and an absolute branching fraction measurement of D+ --> eta e+ nu_e, evidence for and absolute branching fraction measurement of D0 --> K- pi+ pi- e+ nu_e, and upper limits for D+ --> etaprime e+ nu_e and D+ --> phi e+ nu_e which are about two orders of magnitude more restrictive than those obtained by other experiments to date. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
356 Anna Sfyrla (CDF Collaboration) WW and WZ production in charged lepton-neutrino plus dijet final state at CDF We present a search for WW and WZ production in charged lepton-neutrino plus dijet final states at $\sqrt{s}=1.96$~TeV, using approximately 1.3 fb$^{-1}$ of data accumulated with the CDF detector. This channel has not been observed in hadron colliders so far because of the large single W plus jets background. This mode however has much larger branching fractions than the cleaner fully leptonic mode making it more sensitive to anomalous triple gauge couplings which would manifest themselves at higher transverse W momenta. Because the final state is topologically similar to the associated production of a Higgs with a W, the techniques developed in this analysis will also be applicable there. The analysis is optimized by using an artificial neural network for the event selection. High-Energy Electroweak Physics sfyrla@fnal.gov
357 CLEO Collaboration Ds semileptonic decays at CLEO We present studies of semileptonic decays of the Ds meson. This includes several first measurements of absolute Ds semileptonic decays, of inclusive branching fractions as well as exclusive Cabibbo favored and Cabibbo suppressed decay modes. Flavour Physics and CP Violation cleoac@mail.lepp.cornell.edu
358 K.K. Gan Bandwidths of micro twisted-pair cables and fusion spliced SIMM-GRIN fiber and radiation hardness of PIN/VCSEL arrays We study the feasibility of fabricating an optical link for the SLHC ATLAS silicon tracker based on the current pixel optical link architecture. The electrical signals between the current pixel modules and the optical modules are transmitted via micro-twisted cables. The optical signals between the optical modules and the data acquisition system are transmitted via rad-hard SIMM fibers spliced to rad-tolerant GRIN fibers. The link has several nice features. We have measured the bandwidths of the transmission lines and the results indicate that the micro twisted-pair cables can transmit signals up to ~ 1 Gb/s and the fusion spliced fiber ribbon can transmit signals up to ~ 2 Gb/s. We have irradiated PIN and VCSEL arrays with 24 GeV protons and find at least one candidate PIN and one VCSEL array that can survive to the SLHC dosage. Detectors and Data Handling Speaker to be determined gan@mps.ohio-state.edu
359 K.K. Gan An MT-Style Optical Package for Optical Data Transmission An novel optical package for mounting a VCSEL or PIN array for transmitting and receiving optical signals has been developed. The package is fabricated using BeO as the substrate for efficient removal of heat produced by the array. The array is connected to the driver or receiver chip using three dimenional traces together with wire bonds. Each array couples to a fiber ribbon terminated in a commercial MT connector. The package is quite compact with its physical size significantly smaller than that of the MT connector. This design simplifies the testing and assembly of the optical components because the MT connector with the long fibers attached can be remounted with ease while preserving good light coupling efficiency. This non-magnetic package can be used in the high radiation environment such as the SLHC. Detectors and Data Handling Speaker to be determined gan@mps.ohio-state.edu
360 Kenneth Lessnoff Carbon fibre spherical mirrors for the LHCb RICH1 detector The design, manufacture and testing of light-weight carbon fibre spherical converging mirrors for the upstream Ring Imaging Cherenkov Detector of LHCb, RICH1, is described. The mirrors need to be light-weight to reduce the material budget, fluorocarbon-compatible to avoid degradation in the RICH1 C4F10 radiator, and be able to withstand the intense radiation environment of the LHC. The results for prototypes and for the final mirrors are reported. Detectors and Data Handling kenneth.lessnoff@cern.ch
361 ZEUS Collaboration Leading proton production in deep inelastic ep scattering with ZEUS at HERA The semi-inclusive reaction ep -> eXp, with a final-state proton carrying a large fraction of the incoming proton energy, xL > 0.4, and transverse momentum squared pT2 < 0.5 GeV2, was studied with the ZEUS detector at HERA for exchanged photon virtualities Q2 > 3 GeV2 using an integrated luminosity of 12.8 pb-1. Leading protons were detected with the ZEUS leading proton spectrometer. The leading-proton production cross section, its ratio to the inclusive DIS ep cross section and the leading proton structure function F2LP were measured as a function of xL, pT2, Q2 and the Bjorken scaling variable, x. The mean charge multiplicities were measured as a function of the total hadronic momentum and compared to e+e- and pp data. Strong Interactions halina@mail.desy.de
362 M. Bonesini on behalf of NA56/SPY Collaboration Deuteron production in p-Be interactions at 450 GeV/c and the coalescing model The analysis of the deuteron production in the NA56/SPY data, taken with 450 GeV/c protons on a Beryllium target is summarized. Results include an evaluation of the cross-section production ratios (d/p) and of the deuteron invariant cross sections, both as a function of momentum in the forward direction and of transverse secondary momentum. In the framework of the coalescence model for deuteron production the coalescence factor k is determined, with no evidence for a p_d^-2 dependence, as assumed in some theoretical models. High-Energy Nuclear Physics also suitable for Strong Interactions Section maurizio.bonesini@mib.infn.it
363 Antony Sarrat, CEA Saclay Micropattern based TPC for T2K's tracking system T2K is a second generation long baseline neutrino experiment designed to investigate theta_{13}. This measurement could be the key to understand the matter-antimatter asymmetry of the universe. The neutrino flux and cross sections will be measured in a near detector complex, located at 280m from the proton beam target. A major component of this magnetized near detector include 3 large TPCs which will provide an accurate measurement of the neutrino energy spectrum. The total readout area of the TPCs (appr. 10m^2), will be instrumented with gaseous micro-pattern detectors, using the novel "bulk" Micromegas technology: a specific chip has been designed to read the 120k pads. Two large "bulk" detectors (26*27 cm^2) have been built and tested in the former HARP field cage at CERN, with cosmic ray data in a magnetic field up to 0.4T. We present the major components of this innovative TPC detector, including the field cage, the Micromegas instrumented end-plate and the electronic readout system. The detector performances, extrapolated from prototype data, will also be presented. Detectors and Data Handling asarrat@cea.fr
364 Rui Luo Leptogenesis in the E6SSM We investigate leptogenesis in the E6 inspired Supersymmetric Standard Model (E6SSM), which has an extra U(1) symmetry. In this model, the right-handed neutrino doesn't participate in gauge interactions, allowing it to be used for both the SEESAW mechanism and leptogenesis. The decay of this heavy right-handed Majorana neutrino, via exotic leptons and leptoquarks, leads to the generation of a lepton asymmetry. We find that the lepton asymmetry can be drastically enhanced, even when the right-handed neutrino is much lighter than 10^9 GeV . Neutrino Physics Funding for the conference is dependent on presentation of a talk. r.luo@physics.gla.ac.uk
365 C.D.Froggatt, R.Nevzorov, H.B.Nielsen Smallness of the cosmological constant and the multiple point principle It is well known that global symmetries can protect a zero value for the cosmological constant in the N=1 supergravity (SUGRA). The best motivated scenario of this type is no--scale supergravity where global symmetries guarantee not only vanishing of the vacuum energy density but also preserve local supersymmetry (SUSY) in all vacua. The breakdown of these symmetries that ensures the vanishing of the vacuum energy density near the physical vacuum leads to the natural realization of the multiple point principle (MPP) assumption, i.e. results in the set of degenerate vacua with broken and unbroken local supersymmetry. We present the minimal SUGRA model where the MPP assumption is realised naturally at the tree--level. In this model vacua with broken and unbroken local supersymmetry in the hidden sector (first and second phases) have the same energy density without any extra fine-tuning. Although hidden sector does not give rise to the breakdown of supersymmetry in the second phase SUSY may be broken there dynamically in the observable sector. Then a positive value of the energy density in the second vacuum is induced which can be assigned, by virtue of MPP, to all other phases including the one in which we live. The total vacuum energy density is naturally tiny or zero in this case. In order to reproduce the observed value of the cosmological constant and preserve gauge coupling unification the low energy matter content has to involve extra matter beyond the MSSM contained in 5+\bar{5} representations of SU(5). Extra fields have masses of the order of supersymmetry breaking scale so that they can be detected at future colliders. We also discuss the supersymmetry breakdown and possible solution of the cosmological constant problem by MPP in models with an enlarged gauge symmetry. Astroparticle Physics, Gravitational Waves and Cosmology "based on C.Froggatt, R.Nevzorov and H.B.Nielsen, On the smallness of the cosmological constant in SUGRA models, Nucl. Phys. B 743 (2006) 133; arXiv:hep-ph/0511259." r.nevzorov@physics.gla.ac.uk
366 Peter Athron Electroweak symmetry breaking in the E6SSM The Exceptional Supersymmetric Standard Model (E6SSM) is an E6 inspired model with an extra gauged U(1) symmetry, which solves the mu-problem in a similar way to the NMSSM but without the accompanying problems of singlet tadpoles or domain walls. It predicts new exotic particles at the TeV scale. We investigate the Renormalisation Group Evolution of the MSUGRA inspired Constrained ESSM and test electroweak symmetry breaking for a selection of interesting scenarios. We present detailed particle spectra for these models that could be observed at the LHC. The two loop corrections to the light Higgs allow it to be as heavy as 155 GeV, which may ease the Little Hierarchy problem. Physics Beyond the Standard Model Please note that I will only get funding for the conference if I give a talk. p.athron@physics.gla.ac.uk
367 H1 Collaboration Dijet Cross Sections and Parton Densities in Diffractive DIS at HERA Differential dijet cross sections in diffractive deep inelastic scattering processes have been measured with the H1 detector at HERA using an integrated luminosity of 51.5 pb^{-1}. The selected events are of the type $ep\rightarrow eXY$, where the system $X$ contains at least two jets and is well separated in rapidity from the proton dissociation system $Y$. The dijet data are compared with QCD predictions at next to leading order (NLO) based on diffractive parton distribution functions (DPDFs) extracted from measurements of inclusive diffractive deep inelastic scattering. The prediction describes the dijet data well at low and intermediate $\zpom$ (the fraction of the exchanged momentum carried by the parton entering the hard interaction) where the gluon density is well determined from the inclusive diffractive data, supporting QCD factorisation. A new set of diffractive parton densities is obtained through a simultaneous fit to the inclusive diffractive data and the new dijet results. This allows for a precise determination of both the diffractive quark and gluon distributions in the range $0.05<\zpom<0.9$. In particular, the precision on the gluon density at high momentum fractions is improved compared to previous extractions. Strong Interactions obehnke@mail.desy.de
368 C.D.Froggatt, R.Nevzorov, H.B.Nielsen MPP inspired Two-Higgs Doublet Model Multiple point principle (MPP) postulates the existence of as many phases with the same energy density as possible, which are allowed by a given theory. Being applied to the non--supersymmetric two-Higgs doublet extension of the Standard Model (SM) MPP leads to a few different scenarios. In our preferred and best motivated scenario the quartic part of the Higgs effective potential and Yukawa interactions between Higgs doublets and fermions are invariant under Peccei-Quinn symmetry that ensures the CP conservation in the Higgs sector and the absence of flavour changing neutral currents in the considered model. In this case the existence of a large set of degenerate vacua at some high energy scale (\Lambda) also results in a few relations between Higgs self-coupling constants which can be examined at future colliders. The numerical analysis reveals that these MPP conditions constrain the mass of the SM--like Higgs boson to lie below 180 GeV for a wide set of the MPP scales \Lambda and \tan\beta . Physics Beyond the Standard Model "based on: C.D.Froggatt, L.Laperashvili, R.Nevzorov, H.B.Nielsen and M.Sher, Implementation of the multiple point principle in the two-Higgs doublet model of type II, Phys. Rev. D 73 (2006) 095005; arXiv:hep-ph/0602054. " r.nevzorov@physics.gla.ac.uk
369 Charm and Beauty Production at HERA using dijet events with two leptons in the final state. H1 Collaboration A measurement is presented of charm and beauty photoproduction in $ep$ collisions at a centre-of-mass energy of $318 \mbox{ GeV}$. Data taken by the H1 detector at HERA in the years 1999, 2000, 2004, 2005 and 2006 are analysed. The collected data correspond to an integrated luminosity of $352 \mbox{ pb}^{-1}$. Events are selected with contain two jets and two leptons in the final state. The first lepton is a muon, the second either a muon or an electron. The relative transverse momentum ptrel of the leptons with respect to the associated jet and the charge and angle correlation of the leptons are exploited to extract the fractions of charm and beauty event on a statistical basis. The results are compared with next to leading order QCD calculations and with leading order QCD calculations supplemented with parton showers. Strong Interactions obehnke@mail.desy.de
370 H1 Collaboration Measurement of Isolated Photon Production in Deep Inelastic Scattering at HERA Results are presented on the production of isolated photons ep -> e+\gamma + X in deep-inelastic scattering with a four-momentum transfer squared of 42500 GeV^2. The cross sections, both inclusive and for events with zero or at least one additional jet, are measured with the H1 detector at the electron-proton collider HERA. The analysis is based on a total integrated luminosity of $227$~pb$^-1$. The production cross section of isolated photons with a transverse energy in the range $3 < E_T^\gamma < 10$~GeV and pseudorapidity range $-1.2 < \eta^\gamma < 1.8$ is measured as a function of $E_T^\gamma$, $\eta^\gamma$ and $Q^2$. The measured cross section receives contributions from photon radiation by a quark as well as wide angle, large $E_T$ bremsstrahlung of the beam lepton.. The data are compared with the predictions from several calculations, which all underestimate the observed signal, particularly in the low $Q^2$ domain. Strong Interactions obehnke@mail.desy.de
371 H1 Collaboration Charged Particle Production in High Q2 Deep Inelastic Scattering at HERA The average charged track multiplicity and the distribution of the normalised scaled momentum, $\xp$, of charged final state hadrons are measured in deep-inelastic $\ep$ scattering at high $Q^2$ in the Breit frame of reference. This analysis covers the range of photon virtuality $100 < Q^2 < 20\,000~\GeV^{2}$. Compared with previous results presented by HERA experiments this analysis has significantly higher statistics, extends to higher $Q^2$, and to the full range of $\xp$. The results are compared with $\ee$ annihilation data and with different models of the fragmentation process. The results are also compared with an NLO calculation. Strong Interactions obehnke@mail.desy.de
372 H1 Collaboration Jet Production in Deep-Inelastic Scattering at Low Q^2 at HERA. Jet production is studied in deep-inelastic positron-proton scattering at four momentum transfer squared 5 Strong Interactions obehnke@mail.desy.de
373 H1 Collaboration Charm and Beauty Production at HERA using dijet events with two leptons in the final state A measurement is presented of charm and beauty photoproduction in $ep$ collisions at a centre-of-mass energy of $318 \mbox{ GeV}$. Data taken by the H1 detector at HERA in the years 1999, 2000, 2004, 2005 and 2006 are analysed. The collected data correspond to an integrated luminosity of $352 \mbox{ pb}^{-1}$. Events are selected with contain two jets and two leptons in the final state. The first lepton is a muon, the second either a muon or an electron. The relative transverse momentum ptrel of the leptons with respect to the associated jet and the charge and angle correlation of the leptons are exploited to extract the fractions of charm and beauty event on a statistical basis. The results are compared with next to leading order QCD calculations and with leading order QCD calculations supplemented with parton showers. Strong Interactions obehnke@mail.desy.de
374 Jianrong Deng, Al Goshaw, Beate Heinemann, Jefferson Kist, Chris Lester, Ai Nagano, Tom Phillips (for the CDF Collaboration) Wgamma and Zgamma Production at the Tevatron We present new measurements of the associated production of an intermediate vector boson ($W$, $Z$) with a photon using data collected by the CDF experiment at the Fermilab Tevatron acelerator at $\sqrt{s}=1.96$~TeV. The data correspond to an integrated luminosity of more than 1~fb$^{-1}$. The analysis is performed by selecting $W$ and $Z$ boson in their lepton decay modes and by requiring a photon with transverse energy above $7$~GeV. The cross sections and kinematic distributions are compared to the Standard Model prediction and constraints on anomalous couplings among the electroweak gauge bosons and extracted. High-Energy Electroweak Physics beate@fnal.gov
375 David J Miller CP asymmetries in Exotic Higgs decays to Z bosons at the LHC The discovery of a Higgs candidate at the LHC will be insufficient to claim Higgs discovery. The quantum numbers and interactions of the Higgs boson must be explored before we can be sure of its role in electroweak symmetry breaking. While it is relatively straightforward to determine whether or not it is a CP even or CP odd state, it is harder to distinguish a CP violating mixture of the two. To this end, we examine the Higgs decay to Z-bosons (followed by the Z decays to leptons) by considering the most general scalar-ZZ vertex, and construct CP violating asymmetries. We find analytic expressions for these asymmetries and explore whether or not they will be visible at the LHC. Physics Beyond the Standard Model d.miller@physics.gla.ac.uk
376 Abolfazl Mirjalili Higher order predicted terms for some QCD obsevables, using various scale optimazations procedures Due to strong dependence of the QCD couplings on the renormalization scheme, there have been a number attempts to resolve the ambiguities inherent in fixed order perturbative calculations. It is interestiong to compare the exact value of NNNLO for some QCD obervables like Higgs decay width to gluon-gluon with the estimates one may derive from the knowledge of NNLO correction through the applications of well known optimization methods. We use the methods based on Fastest Apparent Converge (FAC), the Principle of Minimal Sensitivity (PMS), the proposed of Brodsky, Lepage and MackenKenzie (BLM) and finally the approach of COmplete Renormalization Group Improvement (CORGI). We extend the technique of FAC, PMS and BLM to predict NNNLO terms for the desired perturbative QCD observables. The results involves ambiguities on scale setting and the predicted term at required order is not unique while using CORGI approach there are not such difficulties. Strong Interactions The presented work was resulted from my research activity during my short visiting for three months to DESY in Hamburg (Germany). Mirjalili@mail2.ipm.ir
377 J.Ruz on behalf of the CAST collaboration The CAST Experiment. CAST (CERN Axion Solar Telescope) is a helioscope looking for axions coming from the solar core to Earth. The experiment, located at CERN, is based on the Primakoff effect and use the strength of a magnetic field of 9 Tesla provided by a decommissioned LHC magnet. CAST is able to face the Sun during sunrise and sunset and therefore three X-ray detectors are placed on both ends of the magnet waiting for a photon from axion-to-photon conversion due to Primakoff effect. During its first phase that concluded in 2004, CAST looked for axions with masses up to 0.02 eV. The second phase has already started and first data were taken in 2005 and 2006. __So far, CAST´s second phase has managed to reestablish the coherence needed to scan for axions with masses up to 0.38 eV by using a 4He buffer gas that allows the experiment to look into the theoretical regions for the axion. An extension of CAST phase II is under construction and will allow CAST to extend its sensitivity up to axion masses of 1.16 eV during the following years. Astroparticle Physics, Gravitational Waves and Cosmology Jaime.Ruz@cern.ch
378 David Eriksson, Stefan Hesselbach, Johan Rathsman Associated charged Higgs and W boson production in the MSSM at the CERN Large Hadron Collider We investigate the viability of observing charged Higgs bosons (H^+) produced in association with W bosons at the CERN Large Hadron Collider, using the leptonic decay H^+ -> tau^+ nu_tau and hadronic W-decay, within different scenarios of the Minimal Supersymmetric Standard Model (MSSM) with both real and complex parameters. Performing a parton level study we show how the irreducible Standard Model background from W + 2 jets can be controlled by applying appropriate cuts and find that the size of a possible signal depends on the cuts needed to suppress QCD backgrounds and misidentifications. In the standard maximal mixing scenario of the MSSM we find a viable signal for large tan beta and intermediate H^+ masses (~ m_t) when using optimistic cuts whereas for more pessimistic ones we only find a viable signal for very large tan beta (> 50). We have also investigated a special class of MSSM scenarios with large mass-splittings among the heavy Higgs bosons where the cross-section can be resonantly enhanced by factors up to one hundred, with a strong dependence on the CP-violating phases. Even so we find that the signal after cuts remains small except for small masses (<= m_t) with optimistic cuts. Finally, in all the scenarios we have investigated we have only found small CP-asymmetries. Physics Beyond the Standard Model s.hesselbach@phys.soton.ac.uk
379 Ali Murat Guler (for the CHORUS collaboration) Measurement of associated charm production in neutrino interactions Associated charm production in neutrino-nucleon scattering is a very rare process and therefore difficult to measure. The improvement of automatic scanning systems in the \mbox{CHORUS} experiment allows an efficient search for short-living particles in emulsion to be performed. Hence a search for rare processes such as the associated charm production becomes possible through the observation of the double charm decay topology with a very low background. In this paper we present a search for associated charm production in both neutral-current (NC) and charged-current (CC) $\nu_\mu$ interactions. About 130,000 $\nu_\mu$ interactions located in the emulsion target have been analysed. Three double charm decays have been observed in the neutral-current (NC) sample with an estimated background of 0.18 $\pm$ 0.05. The relative rate of the associated charm cross-section in DIS NC $\nu_\mu$ interactions, $\sigma(c\bar{c} \nu_{\mu})$/$\sigma_\mathrm{NC}^\mathrm{DIS} = (3.76^{+3.07}_{-2.52} \pm 0.56) \times 10^{-3}$ has been measured. One double charm decay has been observed in CC $\nu_\mu$ interactions with an estimated background of 0.18 $\pm$ 0.06. The upper limit on associated charm production at 90\% C.L. in CC $\nu_\mu$ interactions has been found to be $\sigma (c\bar{c} \mu^-)/\sigma_\mathrm{CC} < 9.69 \times 10^{-4}$. Flavour Physics and CP Violation the paper is being submitted for publication ali.murat.guler@cern.ch
380 Ali Murat Guler (for the CHORUS collaboration) Measurement of associated charm production in neutrino interactions Associated charm production in neutrino-nucleon scattering is a very rare process and therefore difficult to measure. The improvement of automatic scanning systems in the \mbox{CHORUS} experiment allows an efficient search for short-living particles in emulsion to be performed. Hence a search for rare processes such as the associated charm production becomes possible through the observation of the double charm decay topology with a very low background. In this paper we present a search for associated charm production in both neutral-current (NC) and charged-current (CC) $\nu_\mu$ interactions. About 130,000 $\nu_\mu$ interactions located in the emulsion target have been analysed. Three double charm decays have been observed in the neutral-current (NC) sample with an estimated background of 0.18 $\pm$ 0.05. The relative rate of the associated charm cross-section in DIS NC $\nu_\mu$ interactions, $\sigma(c\bar{c} \nu_{\mu})$/$\sigma_\mathrm{NC}^\mathrm{DIS} = (3.76^{+3.07}_{-2.52} \pm 0.56) \times 10^{-3}$ has been measured. One double charm decay has been observed in CC $\nu_\mu$ interactions with an estimated background of 0.18 $\pm$ 0.06. The upper limit on associated charm production at 90\% C.L. in CC $\nu_\mu$ interactions has been found to be $\sigma (c\bar{c} \mu^-)/\sigma_\mathrm{CC} < 9.69 \times 10^{-4}$. Neutrino Physics the paper is being submitted for publication ali.murat.guler@cern.ch
381 S. Moretti, S. Munir, P. Poulose Explicit CP Violation in the MSSM Through Higgs --> gamma.gamma The MSSM with explicit CP violation is studied through the di-photon decay channel of the lightest neutral Higgs boson. Through the leading one-loop order H1 --> gammar.gamma is affected by a large number of Higgs-sparticle couplings, which could be complex. Our preliminary scan over the Supersymmetric parameter space shows that more than 50% average deviations are possible, in either direction, in the corresponding branching ratio, with respect to the case of the CP-conserving MSSM. In particular, our analysis shows that in the presence of a light stop (with mass ~ 200 GeV) a CP-violating phase Arg(mu) ~ 90(deg) can render the H1 --> gamma.gamma branching ratio more than 10 times larger, for suitable combinations of the other MSSM parameters. Physics Beyond the Standard Model poulose@phys.soton.ac.uk
382 D0 Collaboration B_s Mixing using Semileptonic Decays at Dzero We report results on the determination of the B_s oscillation frequency using a large data set taken at the Dzero experiment during RunII of the Tevatron. The Dzero detector was upgraded recently to include an additional layer of silicon close to the beam pipe to significantly improve the decay length resolution. We search for time-dependent oscillations of flavor specific, semileptonic B_s decays where the flavor of the B_s at production is determined by studying inclusive properties of the event. Flavour Physics and CP Violation "rickv@fnal.gov, hobbs@fnal.gov, bcasey@fnal.gov"
383 D0 Collaboration B_s Mixing using Hadronic Decays at Dzero Latest results on the mixing of B_s mesons from the Dzero experiment at the Fermilab Tevatron Collider will be presented using a large data set of proton-antiproton collisions. For a precise measurement of the mixing frequency, fully reconstructed decay channels are desirable since these minimize the ambiguities associated with the boost of the B_s meson. These decay modes are accessible at Dzero through the muons originating from semileptonic decays of the other b hadron produced in the event. Using the single muon data set, we search for time-dependent oscillations of flavor specific, hadronic B_s decays where the flavor of the B_s at production is determined by the muon as well as other inclusive properties of the event. Details of the strengths and weaknesses of this trigger strategy will also be discussed. Flavour Physics and CP Violation "rickv@fnal.gov, hobbs@fnal.gov, bcasey@fnal.gov"
384 D0 Collaboration Measurements of the CP-Conserving and CP-Violating B_s Mixing Parameters using B_s -> J/psi phi Decays at Dzero Using a large data set collected with the Dzero detector of the Fermilab Tevatron, we present a study of the decay B_s -> J/psi phi. From a simultaneous fit to the distributions in the candidate mass, proper decay length, and three angles of the decay products, we obtain the average lifetime of the Bs system, the width difference between the light and heavy mass eigenstates, and the CP violating phase of B_s mixing using all reconstructed B_s candidates. The flavor of the Bs meson at production is used in events where this information is available allowing for a more precise determination of the CP-violating phase as well as a determination of the mass difference between the light and heavy mass eigenstates. Flavour Physics and CP Violation "rickv@fnal.gov, hobbs@fnal.gov, bcasey@fnal.gov"
385 D0 Collaboration Study of the Charge Asymmetry in Semileptonic Decays of B_s Mesons at Dzero We present studies of the charge asymmetry in semileptonic neutral B meson decays using a large sample of data collected by the Dzero detector operating at the Fermilab Tevatron. We present an analysis of the inclusive asymmetry between positive and negative like-sign dimuon events containing contributions from both B_d and B_s mesons. Knowledge of the asymmetry in Bd mesons from independent experiments is used to extract the component of the asymmetry attributed to B_s mesons. A direct measurement of the charge asymmetry in B_s mesons is also presented by comparing the semileptonic widths of Bs and anti-Bs reconstructed using the Ds-/+ mu+/- decay channels. Results from the two analyses are combined to provide information on the CP violating phase of B_s mixing. Flavour Physics and CP Violation "rickv@fnal.gov, hobbs@fnal.gov, bcasey@fnal.gov"
386 D0 Collaboration B_s Lifetime and Width Difference Measurements using B_s Decays to D_s mu X and Ds(*)Ds(*) at Dzero We present studies of B_s mesons using a large sample of D_s mesons associated with a muon recorded by the Dzero detector operating at the Fermilab Tevatron. Using the semileptonic decays B_s -> D_s mu X, we perform the most precise determination of the flavor specific B_s lifetime. This measurement is used to relate the width difference between the heavy and light mass eigenstates with the average width of the eigenstates. A sub sample of the D_s mu data set containing an extra phi meson is used to reconstruct Bs decays to two D_s mesons using the semileptonic decay D_s -> phi mu X. From this sample, we extract the inclusive branching fraction Bs to D_s(*)D_s(*) which can be interpreted as a direct measurement of width difference between the eigenstates. Flavour Physics and CP Violation "rickv@fnal.gov, hobbs@fnal.gov, bcasey@fnal.gov"
387 D0 Collaboration Study of Direct CP Violation in B Meson Decay to Final States Containing Charmonium at Dzero We study Direct CP violation in b -> c cbar stransitions by searching for a charge asymmetry in the decay B+/- -> J/psi K+/-. The results presented are based on a large data set of p pbar collisions recorded by the Dzero detector operating at the Fermilab Tevatron. By accumulating roughly equal data sets with different configurations of the Dzero magnetic spectrometers, we are able to obtain the most precise measurement of this asymmetry. Flavour Physics and CP Violation "rickv@fnal.gov, hobbs@fnal.gov, bcasey@fnal.gov"
388 D0 Collaboration Study of the Polarization of Upsilons produced in proton –antiproton collisions at Dzero Using a large sample of dimuon events recorded by the Dzero detector operating at the Fermilab Tevatron, we study the polarization of Upsilons produced in proton-antiproton collisions at sqrt(s)=1.96 TeV. The polarization is extracted as a function of the transverse momentum of the Upsilon candidate. This measurement provides valuable information on the study of non-relativistic QCD, particularly the octet component of quarkonium systems. Flavour Physics and CP Violation "rickv@fnal.gov, hobbs@fnal.gov, bcasey@fnal.gov"
389 D0 Collaboration Measurement of the Lambda_b Lifetime at Dzero We provide two independent measurements of the Lambda_b lifetime. The first is based on a high statistics sample of partially reconstructed semileptonic Lambda b -> Lambda_c mu X decays. The second is based on a smaller sample of fully reconstructed Lambda_b -> J/psi Lambda decays that has the advantage of complete knowledge of the Lambda_b boost. Both analyses are based on a large data set of p pbar collisions recorded by the Dzero detector operating at the Fermilab Tevatron. The results agree well with each other and also with previously published measurements, giving further indication that tau(Lambda_b) < tau(B_d). Flavour Physics and CP Violation "rickv@fnal.gov, hobbs@fnal.gov, bcasey@fnal.gov"
390 D0 Collaboration Search for Annihilation Decays of B_s Mesons and Radiative Decays of D+ mesons We search for the rare decays B_s -> mu+mu- and D+ -> pi+ mu+ mu- using a large data set of p pbar collisions recorded by the Dzero detector operating at the Fermilab Tevatron. These modes are expected to have sizeable enhancements above the Standard Model rate due to new physics. The B_s annihilation rate is expected to have orders of magnitude enhancement in many supersymmetric models while the radiative charm decays probe scenarios where sizeable new physics contributions are visible in the up-sector quarks but not in the down-sector quarks. We present the most stringent limits on both processes. Flavour Physics and CP Violation "rickv@fnal.gov, hobbs@fnal.gov, bcasey@fnal.gov"
391 D0 Collaboration Properties of Excited and Heavy b Hadrons We study the properties of orbitally excited B_d and B_s mesons as well as heavier b mesons and baryons. The studies are based on a large data set of p pbar collisions recorded by the Dzero detector operating at the Fermilab Tevatron. We explore the mass splitting and production fractions in the B_d** and B_s** system, the mass and lifetime of the Bc meson, and search for new b baryons. We also perform the first measurement of the semileptonic Bs branching fraction to orbitally excited D_s mesons. Flavour Physics and CP Violation "rickv@fnal.gov, hobbs@fnal.gov, bcasey@fnal.gov"
392 D0 Collaboration Searches for Extra Dimensions and for Heavy Resonances in Dilepton, Diphoton, Electron + Photon and Electron + Missing E_T Final States with the D0 Detector The high-mass spectrum of lepton and photon pairs is sensitive to a broad array of new physics. Examples are searches for extra dimensions in different models in the dielectron, dimuon, and diphoton channels, and Z´ bosons with Standard-Model-like couplings to fermions as well as in a variety of GUT-inspired models. A direct search for electron compositeness is possible in the production of excited electrons decaying into electron and photon. In addition, the electron (or muon) plus missing E_T data sample can be searched for a W´ boson. We report on the latest results in searches in the high mass dielectron, dimuon, diphoton, electron plus photon, and electron plus missing E_T channels obtained by the D0 experiment at the Tevatron, using a data set corresponding to an integrated luminosity of about 1 fb^-1, and in most cases substantially exceeding the reach of previous searches. Physics Beyond the Standard Model "rickv@fnal.gov,hobbs@fnal.gov,grivaz@lal.in2p3.fr"
393 D0 Collaboration Search for Supersymmetry with Gauge-Mediated Breaking We report the results of a search for supersymmetry (SUSY) with gauge-mediated breaking in the missing transverse energy distribution of inclusive diphoton events using approximately 1.2 fb-1 of data colleced by the D0 experiment at the Fermilab Tevatron Collider in 2002-2006. This analysis is the most sensitive probe for the gauge-mediated SUSY models up to date with a short-lived neutralino as the next-lightest SUSY particle. Physics Beyond the Standard Model "rickv@fnal.gov,hobbs@fnal.gov,grivaz@lal.in2p3.fr"
394 D0 Collaboration Search for Large Extra Spatial Dimensions in Jets + Missing E_T Topologies A search for signals of large extra spatial dimensions is performed using ~1 fb-1 of data from p-pbar collisions at a center-of-mass energy of 1.96 TeV, collected by the DO detector at the Fermilab Tevatron. The topologies analyzed consist of single jets and acoplanar jets with missing E_T from direct production of gravitons. Constraints on the fundamental Planck scale have been derived. Physics Beyond the Standard Model "rickv@fnal.gov,hobbs@fnal.gov,grivaz@lal.in2p3.fr"
395 D0 Collaboration Search for RPV SUSY in e+mu Final State error-replaced by next entry Physics Beyond the Standard Model "rickv@fnal.gov,hobbs@fnal.gov,grivaz@lal.in2p3.fr"
396 D0 Collaboration Search for RPV SUSY in the e+mu Final State We study the production of high p_T electron+muon final states with 1 fb-1 of Dzero RunIIa data. The number of events passing our selection criteria is consistent with the Standard Model(SM) expectation. The distributions of kinematics variables of the final states are also in good agreement with the SM prediction. We set limits on the parameters of a particular Supersymmetric (SUSY) model that predicts an enhancement of the high p_T electron+muon final states via R-Parity Violating production and decay of scaler sneutrino resonances. Physics Beyond the Standard Model "rickv@fnal.gov,hobbs@fnal.gov,grivaz@lal.in2p3.fr"
397 D0 Collaboration Searches for Leptoquark Production in pp(bar) Collisions at the D0 Experiment We report on searches for the production of scalar and vector leptoquarks in pp(bar) collisions at the Tevatron collider, which are based on integrated luminosities of up to 1 fb-1 collected with the D0 detector. Leptoquarks, which are predicted by several extensions of the Standard Model, are hypothetical particles carrying both lepton and quark flavors. At hadron colliders they can either be pair-produced via the strong interaction or a single leptoquark can be produced in association with a lepton via the hypothesized leptoquark-lepton-quark coupling Searches for the pair-production of leptoquarks of all three generations have been performed using the LQ-LQ(bar) ->l^+l^-qq(bar), l^\pm nu qq(bar), and nunu(bar)qq(bar) final states. A search for the single production of leptoquarks coupling to muons is based on the decay channel LQ mu -> mu q mu$. Upper limits on the production cross sections are given and are used to derive lower limits on the leptoquark masses. Physics Beyond the Standard Model "rickv@fnal.gov,hobbs@fnal.gov,grivaz@lal.in2p3.fr"
398 D0 Collaboration Searches for Squarks and Gluinos in Jets+Missing Transverse Energy Final States Searches in the framework of R-parity conserving supergravity inspired models have been performed in data collected by the D0 detector at the Tevatron pp(bar) collider at a center-of-mass energy of sqrt{s} = 1.96 TeV. Topologies analyzed consist of acoplanar-jets and multijets events with large missing transvers energy in the final state. In the first search, generic squarks and gluinos productions were investigated in 1 fb-1 of data. The data show good agreement with the standard model expectations and improved mass limits have been derived. Lower limits of 375 GeV and 289 GeV are derived at 95% CL on the squarks and gluino masses, respectively, with tan(beta) = 3, A_0 = 0 and \mu < 0. Previous limits obtained by D0 collaboration are improved by about 50 GeV. Supergravity inspired models suggest the existence of light supersymmetric partners of the third generation quarks: a light stop for moderate values of tan(beta), a light sbottom for large tan(beta). If the stop or sbottom is the next-to-lightest supersymmetric particle, the expected decay channels are \tilde{t} -> c chi^0_1 and \tilde{b} -> b chi^0_1, respectively, with \chi^0_1 assumed to be the lightest supersymmetric particle. Pair production of stops or sbottoms will therefore lead to the signature of two acoplanar heavy flavor jets and missing transverse energy. The searches for such final states are performed, improving significantly upon the results from Run I of the Tevatron. Physics Beyond the Standard Model "rickv@fnal.gov,hobbs@fnal.gov,grivaz@lal.in2p3.fr"
399 D0 Collaboration Search for the Associated Production of Charginos and Neutralinos with the D0 Detector A search for associated production of charginos and neutralinos is performed using data recorded with the D0 detector at a p-pbar center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. This analysis considers final states with missing transverse energy and three leptons, including hadronic decays of tau leptons. With more than 2 fb-1 of data recorded by the D0 experiment, the expected sensitivity reaches well beyond existing limits on the chargino mass, in particular in regions of parameter space with enhanced leptonic branching fractions. Physics Beyond the Standard Model "rickv@fnal.gov,hobbs@fnal.gov,grivaz@lal.in2p3.fr"
400 D0 Collaboration Measurement of the tt(bar) Production Cross Section at D0 in the Lepton+Jets Channel We present measuremets of the tt(bar) production cross section at a center-of-mass energy of 1.96 TeV. The analyses is based on the selection of events with one charged lepton (electron or muon), missing transverse energy, and 3 or more jets with p_T > 20 GeV and |η| < 2.5. We utilize up to 1 fb-1 of data samples collected using the D0 detector. We separate the tt(bar) signal from background processes using kinematic information. A subset of measurements use algorithms to identify b-quark jets that are associated with top quark decays. Neural Network algorithm that use lifetime information and soft lepton tagging are employed. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,webermi@fnal.gov"
401 D0 Collaboration Measurement of the tt(bar) cross section at D0 in the dilepton channel We report on the measurement of the production cross section of tt(bar) quark pairs decaying in the dilepton mode. This analysis is based on data taken with the D0 Detector at the Fermilab Tevatron pp(bar)-collider at a center-of-mass energy of 1.96 TeV. The data corresponding to an integrated luminosity of about 1.1 fb−1 were recorded in the years 2002 to 2006. We consider final states with two well-identified leptons in the final state as well as one lepton and one track. In the latter case, we use information from b-jet identification algorithm to suppress background. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,webermi@fnal.gov"
402 D0 Collaboration Measurement of the tt(bar) Production Cross Section at D0 using All-Hadronic and tau+Jet Events We report on the measurement of the tt(bar) production cross section with candidate events in the all-hadronic and tau+jets final state. For the tau+jet channel we select events in which the tau lepton subsequently decays to one or three charged hadrons plus neutral hadrons and a neutrino. We separate the tt(bar) signal from the QCD multijet background by requiring at least one b-tagged jet and by using kinematic criteria. Different approaches to furhter improve the accuracy of the cross section measurement in the all-hadronic sample are presented. Several kinematic criteria are combined into a neural network in one method, while invariant masses of jet combinations to reconstruct the W boson and top quark mass are used in another measurement. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,webermi@fnal.gov"
403 D0 Collaboration Measurement of the Top Quark Mass at D0 in the Lepton+Jets Channel We report on measurements of the top quark mass using tt(bar) candidates in the lepton+jets final state. Up to 1 fb-1 of data collected with the D0 experiment are utilized. For each event, a probability is calculated as a function of the top mass and the overall jet energy scale. The probability is based on the differential cross section for t-tbar production or a kinematic event reconstruction. The top mass and jet energy scale are extracted by maximizing a likelihood constructed as the product of the single event probabilities. The overall jet energy scale is constraint by the two jets from the hadronic W boson decay. Further sensitivity is obtained by methods utilizing information coming from b jet identification High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,webermi@fnal.gov"
404 D0 Collaboration Measurement of the Top Quark Mass at D0 using All-Hadronic Events We report on the measurement of the top quark mass using tt(bar) candidates in the all-hadronic decay channel. The tt(bar) signal was discriminated from background using kinematic information and by requiring two identified b jets. The mass was extracted by comparing templates of tt(bar) signal and multi-jet background to the selected candidates. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,webermi@fnal.gov"
405 D0 Collaboration Measurement of the Top Quark Mass at D0 using Dilepton Events We present measurements of the top quark mass in the dilepton channel based on approximately 1 fb−1 of data collected by the D0 experiment during Run II of the Fermilab Tevatron collider. The kinematics of these events are not sufficiently constrained by the observed final state to reconstruct the top quark mass. With different methods, we compute a likelihood for the observed events to occur for a range of assumed top quark masses. For each event we extract estimators for the top quark mass from this likelihood. We compare the distribution of the estimators for all events to Monte Carlo predictions for different input top quark masses in a maximum likelihood fit to extract the top quark mass. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,webermi@fnal.gov"
406 D0 Collaboration Probing the SM with Top Quark Events We report on several measurements probing the standard model in top quark events. We present a measurement of the ratio R = B(t -> W b)/B(t -> W q), which is expected to exceed 0.998 at the 95% confidence level. Experimentally, we measure the ratio based on the fraction of candidate events with 0, 1, or 2 b-tagged jets. We also report on a measurement of the charge of the top quark by resolving the kinematic ambiguity between the standard model scenario of a charge 2/3 top quark and an exotic scenario of a charge −4/3 quark. Top quark events provide a unique sample to measure the helicity of the W boson. We report on a measurement of the fraction of right-handed W bosons in top quark decay, which is consistent with the null expectation from the standard model. We also report on the measurement of forward-backward asymmetry in tt(bar) production in proton-antiproton collisions. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,webermi@fnal.gov"
407 D0 Collaboration Single op Quark Production at D0 and Direct Measurement of |V_tb| We report on several measurements probing the standard model in top quark events. We present a measurement of the ratio R = B(t -> W b)/B(t -> W q), which is expected to exceed 0.998 at the 95% confidence level. Experimentally, we measure the ratio based on the fraction of candidate events with 0, 1, or 2 b-tagged jets. We also report on a measurement of the charge of the top quark by resolving the kinematic ambiguity between the standard model scenario of a charge 2/3 top quark and an exotic scenario of a charge −4/3 quark. Top quark events provide a unique sample to measure the helicity of the W boson. We report on a measurement of the fraction of right-handed W bosons in top quark decay, which is consistent with the null expectation from the standard model. We also report on the measurement of forward-backward asymmetry in tt(bar) production in proton-antiproton collisions. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,webermi@fnal.gov"
408 D0 Collaboration Single Top Quark Production at D0 and Direct Measurement of |V_tb| We report on the evidence for single top quark production in proton-antiproton collisions using a dataset of almost 1 fb−1 collected with the D0 detector. Single top quarks are expected to be produced in association with bottom quarks through the exchange of a W boson in the s-channel and the t-channel. We select events with one energetic electron or muon, missing transverse energy, and two, three or four jets, with at least one b-tagged jet. Several complementary measurements using neural net discriminants, decision trees and a matrix element technique are presented. All measurements are consistent among each other and measure a cross section compatible with the Standard Model prediction for electroweak production of single top. The combination of the different analyses shows evidence for single top quark production We also present the first direct measurement of the CKM matrix element |V_tb|. High-Energy Electroweak Physics *** Note ***: the previous abstract of the same title was went with incorrect abstract text. This is the correct one. "rickv@fnal.gov,hobbs@fnal.gov,webermi@fnal.gov"
409 D0 Collaboration Search for Associated Production of W and Higgs Bosons in l-nu-bb Final States We present preliminary results of a search for the Higgs boson through its associated production with W for masses between 105 and 155 GeV in ppbar collisions at sqrt(s) = 1.96 TeV. The search is performed in events containing one lepton (electron or muon), an imbalance in the transverse energy, and two b-tagged jets. We compare results obtained in two approaches, one of them relying on a sequence of kinematic cuts, and another one separating signal from background using leading-order matrix element description of relevant physics processes. The search is based on 1.0 fb^-1 of integrated luminosity accumulated by the D0 experiment at Fermilab. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,gregorio@in2p3.fr"
410 D0 Collaboration Search for Associated Production of Z and Higgs Bosons in l+l- bb Final States Studies are presented of the search for a light (105-155 GeV) Standard Model Higgs boson produced in association with a Z boson in the Z->l+l- (l= electron or muon) and H->bb decay channel using 0.9 fb^-1 of integrated luminosity of Run II data collected by the D0 detector at the Fermilab pp(bar) collider at sqrt(s) = 1.96 TeV. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,gregorio@in2p3.fr"
411 D0 Collaboration Search for Associated Production of Z and Higgs Bosons in nunu bb Final States Studies are presented from the D0 experiment at Fermilab for the search for a light Standard Model Higgs Boson in association with a Z boson, which decays invisibly to a pair of neutrinos using 0.9 fb^-1 of integrated luminosity of Run II data. This channel relies on the identification of two b-tagged jets from the Higgs Boson decay and on the measurement of a large imbalance in the transverse energy of the event. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,gregorio@in2p3.fr"
412 D0 Collaboration Search for Higgs Bosons in WW(*)->l+l'- Decays The process H->WW(*)->l+l'- (l,l' = e,mu) is studied in ppbar collisions at the center of mass energy sqrt(s) = 1.96 TeV with the upgraded D0 detector at the Fermilab Tevatron accelerator. A Higgs particle with a mass greater than 140 GeV primarily decays into a of W-bosons and the semi-leptonic decay channels of the W provide a clear signature. Besides the search for the Standard Model Higgs, exotic models with enhanced Higgs production cross sections are already probed with data corresponding to integrated luminosity of 0.9 pb^-1. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,gregorio@in2p3.fr"
413 D0 Collaboration Search for Higgs Bosons in WW(*)->ltau Decays We present a search for a Standard Model Higgs Boson in the process H->WW(*)->tau+tau- where one of the taus decays into a muon and neutrino and the other one decays hadronically. Analysis of this channel would improve the current limits of Higgs production cross section due to a large tau->hadrons branching fraction. The results are obtained using 0.9 fb^-1 of data collected by the D0 detector at the Tevatron. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,gregorio@in2p3.fr"
414 D0 Collaboration Combined Upper Limit on Standard Model Higgs Boson Production at D0 A combination of several searches for Standard Model Higgs boson production at D0 is presented. The contributing processes include associated production (WH->lnu bb, ZH->nunu bb, ZH->ll bb) and gluonfusion (gg->H->WW). Analyses are performed on Run II data corresponding to 1 pb^-1 of integrated luminosity. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,gregorio@in2p3.fr"
415 D0 Collaboration Search for New Physics in Top Quark Events The large mass of the top quark, close to the electroweak symmetry-breaking scale, makes it a good candidate for probing physics beyond the Standard Model. Single top quarks may be produced in the decay of a new heavy gauge boson W' and we present limits on the production cross section and the mass of such a W' assuming standard model like couplings. We also search for single top production through flavor changing neutral currents involving gluon, Z boson, or photon exchange. We also search for non-standard model signatures in top pair events. Models for new physics beyond the standard model are probed by looking at possible different event kinematics or deviations in the measured total or differential cross section. Physics Beyond the Standard Model "rickv@fnal.gov,hobbs@fnal.gov,webermi@fnal.gov"
416 Vladimir Lasukov Radioactive decay of Lemaître’s atom The paper studies a quantum theory of the early Universe with a negative cosmological constant. A gravitational analog of the non stationary perturbation theory is developed within which the production of the scalar-field massive quanta by gravitational atoms is studied. Astroparticle Physics, Gravitational Waves and Cosmology lav_8@list.ru
417 Maurice LALOUM STRUCTURE OF THE GALAXY, MATTER-ANTIMATTER ANNIHILATION, AND ORIGIN OF THE COSMIC RAYS We present a theory of the origin of the observed cosmic rays, especially at the highest energies known, involving matter-antimatter annihilation in the median plane of the Milky Way. Accordingly, we discuss the structure and equilibrium of the Galaxy, seen as made of two parallel disks of matter versus antimatter dominance, opposed through the repulsion of an annihilation gas, settled in the equator disk. The admitted suppression of antimatter in the Universe, after the "big-bang", is questioned. Various tests performed, indeed, tend to confirm our theory; in particilar, the now classical power-law energy behaviour of the incident flux of energetic cosmic rays is easily derived, with quite expected exponents of -2.5 and -3 (main dependence, including the first knee). Ultra-high energies, further, are easily attainable, with no necessary restriction of the GZK kind, for instance. Beyond 10^20 eV, rather, a new break is still made possible with steeper logarithmic slope, as hinted by data. The overall equilibrium of the Galaxy is examined; in particular, the mechanical stability of globular clusters, which is deeply paradoxical in usual stances, now appears quite explainable in this theory. Astroparticle Physics, Gravitational Waves and Cosmology "A second paper about neutrinos (axiomatic view on formalism, and consecutive physical predictions),in preparation, might still be presented : ""Quantum Mechanics and Neutrino Oscillation""" Maurice.Laloum@lpnhe.in2p3.fr
418 Maurice LALOUM STRUCTURE OF THE GALAXY, MATTER-ANTIMATTER ANNIHILATION, AND ORIGIN OF THE COSMIC RAYS We present a theory of the origin of the observed cosmic rays, especially at the highest energies known, involving matter-antimatter annihilation in the median plane of the Milky Way. Accordingly, we discuss the structure and equilibrium of the Galaxy, seen as made of two parallel disks of matter versus antimatter dominance, opposed through the repulsion of an annihilation gas, settled in the equator disk. The admitted suppression of antimatter in the Universe, after the "big-bang", is questioned. Various tests performed, indeed, tend to confirm our theory; in particilar, the now classical power-law energy behaviour of the incident flux of energetic cosmic rays is easily derived, with quite expected exponents of -2.5 and -3 (main dependence, including the first knee). Ultra-high energies, further, are easily attainable, with no necessary restriction of the GZK kind, for instance. Beyond 10^20 eV, rather, a new break is still made possible with steeper logarithmic slope, as hinted by data. The overall equilibrium of the Galaxy is examined; in particular, the mechanical stability of globular clusters, which is deeply paradoxical in usual stances, now appears quite explainable in this theory. Astroparticle Physics, Gravitational Waves and Cosmology "A second paper about neutrinos (axiomatic view on formalism, and consecutive physical predictions),in preparation, might still be presented : ""Quantum Mechanics and Neutrino Oscillation""" Maurice.Laloum@lpnhe.in2p3.fr
419 Maurice LALOUM Quantum Mechanics and Neutrino Oscillation We argue that the present classical formalism of neutrino oscillation is only approximate and should require several second-order corrections : kinetic internal dispersion, violation of the very principles of Quantum Mechanics, non-hermiticity of the Hamiltonian operator, finite actual lifetimes, neutrino mass matrix duly of the CKM classical type, existence of probability waves, making credibility to intense radiation from about "Black Holes" (faking "White Wells"). Neutrino Physics Maurice.Laloum@lpnhe.in2p3.fr
420 Franco Bradamante on behalf of the COMPASS Collaboration Transverse Spin Effects at COMPASS To fully specify the quark structure of the nucleon at the twist-two level, three quark distribution functions have to be taken into account: the unpolarised distributions, the helicity distributions and the transverse spin distributions (or transversity). The measurement of transversity in semi-inclusive deep-inelastic scattering via the Collins effect was the main motivation for the measurements of transverse spin effects proposed by the COMPASS experiment at CERN and by the HERMES experiment at DESY. The measurement of transverse spin effects in transversely polarized proton-proton scattering is also an important part of the physics programme of the RHIC-Spin experiments at BNL. In the mean time, the relevance of the Transverse Momentum Dependent (TMD) parton distribution functions, like the Sivers function, became more clear, and is being investigated in the same experiments. In the years 2002, 2003, and 2004 the COMPASS Collaboration has dedicated about 20% of the allocated beam time to the measurement of transverse spin asymmetries using a transversely polarised LiD target and the μ beam of the CERN SPS, set at 160 GeV/c momentum. The analysis of single spin asymmetries of both identified and non-identified hadrons has been now finalized. A total of 10.5 millions of DIS events (Q^2 > 1 GeV^2) have been reconstructed and results are given for all the channels investigated in so far. The Collins and the Sivers asymmetries of both the leading hadron and all the hadrons on deuteron, measured by COMPASS for the first time, are small, if any. The small statistical errors (the systematic errors are believed to be considerably smaller) allow to put tight constrains on the relative contribution of the d quark, when analysed together with the recent HERMES proton data and the Belle measurements of the Collins functions. The COMPASS results for the two-hadron asymmetries and for Lambda polarisation, which are two alternative ways to address transversity, are also presented. Very recently, results have been obtained for the other six TMD azimuthal asymmetries related to the azimuthal modulations which possibly appear in the cross-section of SIDIS on a transversely polarized target. The plans for future measurements are also presented. Strong Interactions franco.bradamante@ts.infn.it
421 J.L. Raaf for the Super-Kamiokande Collaboration Recent atmospheric neutrino results using the SK-I and SK-II datasets We present recent results from analyses of atmospheric neutrino data using the Super-Kamiokande water Cherenkov detector, which has a fiducial volume of 22,500 tons of ultra-pure water. Data from two major running periods of SK are used in the analyses: SK-I (40% photomultiplier coverage) and SK-II (20% photomultiplier coverage). Neutrino Physics I'm sorry this is late! jlraaf@bu.edu
422 D0 Collaboration A Precision Determination of the Z0 Cross Section at D0 We present a measurement of the production cross section for $Z0$ bosons in the D0 experiment at the Fermilab Tevatron. Z^0/gamma* production is detected in the e^+e^- and mu^+mu^- decay modes for dilepton masses between 60 and 130 GeV/c$^2$. A data sample of $\sim$ 75,000 leptonic decays is observed in 1 fb-1 of integrated luminosity. After correction for acceptance, detection efficiencies and QED effects, the total Z^0 production cross section is extracted. Comparison of this cross section with recent NNLO calculations provides a calibration of the luminosity constants used at hadron colliders. Alternatively, the ratio of the cross sections of other high p_T processes to the Z^/gamma^* cross section may yield more precise results than the present technique of normalizing collider cross sections to the total proton anti-proton inelastic scattering cross section. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,bolton@phys.ksu.edu"
423 D0 Collaboration Precision Study of Z-gamma Production at D0 D0 presents a study of \ell\ell\gamma events, where \ell stands for either an electron or a muon, using more than 1 fb-1 of data collected with the D0 detector at the Fermilab Tevatron pp(bar) Collider at sqrt{s} = 1.96 TeV. A total of 453 (437) candidates are observed in the e-e-gamma (mu-mu-gamma) final state, allowing the highest precision measurement to date of the Z-gamma cross section at a hadron collider. The most restrictive limits to date are also set on anomalous trilinear Z-gamma-gamma and Z-Z-gamma gauge boson couplings up to a new physics scale of Lambda = 1.2 TeV. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,bolton@phys.ksu.edu"
424 D0 Collaboration Measurement of the Z Rapidity Distribution using Di-electron events with 0.4 fb-1 of data at sqrt(s)=1960 GeV D0 presents a measurement of the shape of the boson rapidity distribution for pp(bar) -> Z/gamma* -> e^+e^- +X events.The measurement is made using events with mass between 71 < M_{ee} < 111 GeV and uses 0.4 fb-1 of data collected at the Fermilab Tevatron Collider. At Run~II energies, the boson rapidity reaches to rapidity y ~3. The acceptance of the D0 detector extends to rapidities of 2.8. This measurement significantly improves the uncertainties on the rapidity distribution in the forward region compared with previous measurements. A NNLO calculation is compared to our data and found to be in good agreement. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,bolton@phys.ksu.edu"
425 D0 Collaboration W+W- Pair Production at D0 D0 presents a measurement of the WW production cross section at theTevatron, using the fully leptonic decay modes ee, emu, and mumu, and a data set of fb-1. Limits on trilinear gauge couplings are determined using the kinematics of WW events. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,bolton@phys.ksu.edu"
426 D0 Collaboration A Measurement of the W Charge Asymmetry to Large Rapidity at D0 D0 presents a W charge asymmetry measurement in electron channel in rapidity bins up to 3.2 using 1 fb-1 data. Implications for improved determination of parton distribution functions are presented. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,bolton@phys.ksu.edu"
427 D0 Collaboration Measurement of W-gamma Production at D0 The coupling parameters for the W-W-photon vertex are studied by using final state lepton (electron or muon), neutrino, and photon events that were collected at the D0 detector and delivered by the Fermilab Tevatron Collider at a center-of-mass energy of 1.96 TeV. Physical features of the W-W-photon gauge coupling are discussed. The importance of the Standard Model radiation amplitude zero in the photon-lepton charge signed rapidity difference is detailed and the distribution from data is presented. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,bolton@phys.ksu.edu"
428 D0 Collaboration WZ Production at D0 D0 presents the results of a search for WZ diboson production and measurement of the WZ production cross section at the Tevatron in the three lepton (electron or muon) plus missing transverse energy channels using a data set of 1 fb-1. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,bolton@phys.ksu.edu"
429 D0 Collaboration A Search for Z Boson Pair Production at the Tevatron D0 presents a search for Z boson pair production in final states where both Z bosons decay to lepton or muon pairs. The search uses 1 fb-1 of data at sqrt(s)=1.96 TeV collected with the D0 detector at the Fermilab Tevatron. High-Energy Electroweak Physics "rickv@fnal.gov,hobb@fnal.gov,bolton@phys.ksu.edu"
430 Y.Mikami, O.Miller, V.Rajovic, N.K.Watson, J.A.Wilson, J.A.Ballin, P.D.Dauncey, A.-M. Magnan, M.Noy (ImperialJ.P.Crooks, M.Stanitzki, K.D.Stefanov, R.Turchetta, M.Tyndel, E.G.Villani A MAPS-based readout of an electromagnetic calorimeter for the ILC To extract the physics required at the International Linear Collider, the detectors will need an unprecedented hadronic jet energy resolution. For the electromagnetic calorimeter, the use of a silicon-tungsten sampling calorimeters with a highly granular readout has been proposed. The CALICE collaboration is studying options for the sensitive silicon detectors together with common solutions for mechanical structures and readout. The status of one silicon sensor option, which uses Monolithic Active Pixel Sensors (MAPS), will be presented. This novel design would have extremely fine granularity with binary pixel readout integrated into the sensor. This effectively leads to a "tera-pixel" electromagnetic calorimeter system. A overview of the MAPS concept will be given along with the potential advantages of this design. The status of the production of a proof-of-concept sensor will be presented, together with simulation results showing the expected detector and physics performance. Detectors and Data Handling M.M.Stanitzki@rl.ac.uk
431 Olga Mena, Christopher Orme, Sergio Palomares-Ruiz, Silvia Pascoli Phenomenology of intermediate gamma beta-beams We discuss the benefits of using intermediate gamma beta-beams in helping resolve the outstanding problems in neutrino mixing. We present simulations for the CERN-Canfranc and CERN-Boulby baselines before comparing with other Phase II analyses. Possible synergies with alternative Phase II neutrino oscillation experiments will be highlighted. Neutrino Physics c..d.orme@durham.ac.uk
432 Valeria Bartsch, Daniel Beecher, Ilija Bizjak, Mark Lancaster, Sarah Malik, Emily Nurse, Troy Vine, David Waters (for the CDF Collaboration) Direct Measurement of the W Boson Width We present a direct measurement of the $W$ boson width using 370 $pb^{-1}$ and 330 $pb^{-1}$ of data collected with the CDF II detector for the electron and muon decay channels respectively. The measurement is made by fitting to the tail of the transverse mass distribution, exploiting the slower fall-off of the Breit Wigner width component compared to the Gaussian resolution component. High-Energy Electroweak Physics nurse@fnal.gov
433 Olga Mena, Christopher Orme, Sergio Palomares-Ruiz, Silvia Pascoli Phenomenology of intermediate gamma beta-beams We discuss the benefits of using intermediate gamma beta-beams in helping resolve the outstanding problems in neutrino mixing. We present simulations for the CERN-Canfranc and CERN-Boulby baselines before comparing with other Phase II analyses. Possible synergies with alternative Phase II neutrino oscillation experiments will be highlighted. Neutrino Physics The email sent previous had an error. c.d.orme@durham.ac.uk
434 gf bvc vcx High-Energy Nuclear Physics tt@rediffmail.com
435 LHCb collaboration Rare B decays at LHCb The LHCb experiment will search for New Physics in Bs -> mumu decays using the data collected during the very first physics run of LHC, with a 90% CL exclusion sensitivity down to the SM prediction. The latest expectations, based on MC studies with fully simulated events, will be presented. The LHCb sensitivity to other rare and radiative B decays will also be reviewed. Flavour Physics and CP Violation Olivier.Schneider@epfl.ch
436 LHCb collaboration Time-dependent CP asymmetries in Bs decays at LHCb The LHCb experiment will search for New Physics in Bs mixing, notably through the measurement of the Bs mixing phase from the time-dependent CP asymmetry in exclusive Bs decays governed by the b ->ccbar s quark-level transition. Large New Physics effects can be discovered or excluded with the data collected during the very first physics run of LHC. The latest expectations, based on MC studies with fully simulated events, will be presented. The LHCb sensitivity to other CP-violating observables in Bs decays will be reviewed. Flavour Physics and CP Violation Olivier.Schneider@epfl.ch
437 LHCb collaboration CKM angle gamma from tree decays at LHCb The LHCb experiment will exploit a number of methods to measure the CKM angle gamma from B->DK tree decays, with the goal of reaching a precision comparable to the indirect determinations of gamma within the CKM model. The strategy for such measurements, and the sensitvity of the different methods obtained from fully simulated MC events, will be presented. Flavour Physics and CP Violation Olivier.Schneider@epfl.ch
438 K.J. Eskola, V.J. Kolhinen, H. Paukkunen, C.A. Salgado A Global reanalysis of nuclear parton distribution functions We determine the nuclear modifications of parton distribution functions of bound protons at scales $Q^2\ge 1.69$~GeV$^2$ and momentum fractions $10^{-5}\le x\le 1$ in a global analysis which utilizes nuclear hard process data, sum rules and leading-order DGLAP scale evolution. The main improvements over our earlier work {\em EKS98} are the automated $\chi^2$ minimization, simplified and better controllable fit functions, and most importantly, the possibility for error estimates. The resulting 16-parameter fit to the $N=514$ datapoints is good, $\chi^2/{\rm d.o.f}=0.82$. Within the error estimates obtained, the old {\em EKS98} parametrization is found to be fully consistent with the present analysis, with no essential difference in terms of $\chi^2$ either. We also determine separate uncertainty bands for the nuclear gluon and sea quark modifications in the large-$x$ region where they are not stringently constrained by the available data. Comparison with other global analyses is shown and uncertainties demonstrated. Finally, we show that RHIC-BRAHMS data for inclusive hadron production in d+Au collisions lend support for a stronger gluon shadowing at $x<0.01$ and also that fairly large changes in the gluon modifications do not rapidly deteriorate the goodness of the overall fits, as long as the initial gluon modifications in the region $x\sim 0.02-0.04$ remain small. High-Energy Nuclear Physics The possible talk would be given by H. Paukkunen. htpaukku@cc.jyu.fi
439 Ulrich Kerzel (for the LHCb RICH collaboration) The LHCb RICH Detectors The LHCb experiment at the LHC (CERN) has been optimised for high precision measurements of the beauty quark sector. Its main objective is to precisely determine and over-constrain the parameters of the CKM mixing matrix, and to search for further sources of CP violation and new physics beyond the Standard Model in rare B-decays. Efficient particle identification at high purities over a wide momentum range from around 1 to ~100GeV/c is vital to many LHCb analyses. Central to the LHCb particle identification strategy are two Ring Imaging CHerenkov (RICH) detectors which use Silica Aerogel and C4F10 and CF4 gas radiators. The RICH system uses custom-built pixel Hybrid Photon Detectors (HPDs) to measure the Cherenkov photons over the wavelengh range 200-600nm. Each HPD detects photons in 1024 pixels providing 2.5x2.5mm granularity; a total of 484 HPDs cover an active area of 2.6m**2. Production of the HPDs has almost finished and their quality is excellent. The talk summarises the current status of the LHCb RICH detectors, emphasising the production and performance of the HPDs, as well as the overall RICH detector integration and commissioning in preparation for the LHC start-up. (Submitted on behalf of the LHCb RICH collaboration.) Detectors and Data Handling Ulrich.Kerzel@cern.ch
440 The HERMES Collaboration Determination of $\Delta G/G$ from HERMES Data on High-$p_T$ Inclusive Charged Hadrons HERMES has used a high statistics data sample of charged inclusive hadrons to measure double spin asymmetries as a function of $p_T$. From these asymmetries $\Delta g/g$ has been extracted in the region of $1 Strong Interactions "My name is Naomi Makins, and I am the Analysis Coordinator for HERMES. I am submitting all abstracts to your session with myself as contact person. We will select appropriate speakers once we learn which talks you have selected for presentation. " makins@uiuc.edu
441 The HERMES Collaboration Determination of $\Delta G/G$ from HERMES Data on High-$p_T$ Inclusive Charged Hadrons HERMES has used a high statistics data sample of charged inclusive hadrons to measure double spin asymmetries as a function of $p_T$. From these asymmetries $\Delta g/g$ has been extracted in the region of $1 Strong Interactions "My apologies, my first submission of this abstract seems to have been cut off due to lack of line breaks. I am submitting it once more." makins@uiuc.edu
442 The HERMES Collaboration The Final HERMES Data on $g_1^p$ and $g_1^n$ Precise measurements of the spin structure functions $g_1^p(x,Q^2)$ and $g_1^n(x,Q^2)$ are presented over the kinematic range 0.0041 $\leq x \leq $ 0.9 and 0.18 GeV$^2$ $\leq Q^2 \leq $ 20 GeV$^2$. The data were collected at the HERMES experiment at DESY, in deep-inelastic scattering of 27.6 GeV longitudinally polarized positrons off longitudinally polarized hydrogen and deuterium gas targets internal to the HERA storage ring. The results are based on a refined analysis and are corrected for radiative and detector smearing effects using an unfolding algorithm that accounts for the kinematic migration of events. The presently most precise determination of the neutron spin structure function $g_1^n$ is obtained by combining the HERMES deuteron and proton data. Integrals of $g_1^p$, $g_1^d$ and $g_1^n$ are calculated over the measured $x$ range, at $Q^2=5$ GeV$^2$. Neglecting any possible contribution to the $g_1^d$ integral from the region $x\leq$ 0.021, a value of 0.330 $\pm$ 0.011 (theo.) $\pm$ 0.025 $(exp.) $\pm$ 0.028 (evol.) is obtained for the flavor singlet $a_0$ in a leading twist NNLO analysis. Strong Interactions makins@uiuc.edu
443 The HERMES Collaboration HERMES Measurement of the Collins and Sivers Asymmetries from a Transversely Polarized Hydrogen Target In 2005 the HERMES collaboration published first evidence for azimuthal single-spin asymmetries in semi-inclusive production of charged pions on a transversely polarised hydrogen target. The measured asymmetries are caused by both the Collins and the Sivers mechanisms. Their distinctive Fourier components provide signals to previously unmeasured quantities: the transversity quark distribution in conjunction with the Collins fragmentation function (Collins mechanism asymmetry) and the Sivers parton distribution (Sivers mechanism/asymmetry). The transversity distribution will provide a detailed insight into the relativistic nature of the quarks inside the nucleon. Continuous theoretical work could relate the Sivers function to the contribution of the orbital angular momentum of both quarks and gluons to the spin of the nucleon. The presented results for charged pions have a much higher statistical significance than the published data, and are accompanied by the measurement of the Collins and Sivers asymmetries for charged kaons. Strong Interactions makins@uiuc.edu
444 The HERMES Collaboration Accessing Transversity through Dihadron Fragmentation Functions at HERMES Various processes in ep and pp scattering can be used to access the transversity distribution function h1. One of the most promising processes is one-hadron semi-inclusive DIS (e p -> e h X), where h1 appears in the cross section folded with the Collins fragmentation function. Existing HERMES results for this process can now be used to extract transversity for the first time from experimental data, as the Collins function was recently determined by the BELLE collaboration. However, detailed knowledge of the transversity distribution function will most likely require a combined analysis of several different processes. One of these processes studied at HERMES is dihadron fragmentation (e p -> e h h X). The experimental results are presented and the details of the interpretation necessary to compare the results to theoretical model predictions are discussed. Strong Interactions makins@uiuc.edu
445 The HERMES Collaboration Measurement of the Transverse Lambda Polarization, P_n, and the Longitudinal Spin-transfer from the Target, K_LL, in Quasi-Real Photoproduction at HERMES Transverse Lambda and anti-Lambda polarization produced inclusively in quasi-real photon-nucleon scattering have been studied in the HERMES experiment using a 27.6 GeV positron beam incident on hydrogen and deuterium gas targets. The average transverse polarizations were found to be P_n = 0.078 +/- 0.006 (stat) +/- 0.012 (syst) for the Lambda and P_n = -0.025 +/- 0.015 (stat) +/- 0.018 (syst) for the anti-Lambda. The dependence of P_n on the transverse and longitudinal momenta of the hyperon has been studied, and the data for the Lambda indicated a change in production mechanism between the forward- and backward-production hemispheres. First results on the spin-transfer K_LL from longitudinally polarized targets to the Lambda and anti Lambda in quasi-real photoproduction will also be presented. These data lie in the unexplored kinematic region between the measurements of the similar spin-transfer observables D_nn and D_LL measured in proton scattering at E704 and STAR respectively, and also suggest a change in the spin dependence of the Lambda production mechanism between the forward- and backward-production regimes. Strong Interactions makins@uiuc.edu
446 The HERMES Collaboration Transverse Target Spin Asymmetries of Exclusive rho^0 Meson Production Hard exclusive meson production in deep inelastic lepton scattering provides access to the unknown Generalized Parton Distributions (GPDs) of the nucleon. GPDs parameterize the nucleon structure and provide a unified description of exclusive and inclusive reactions. Predictions based on a GPD model have shown that the transverse target spin asymmetry of exclusive rho^0 mesons is sensitive to the GPD E, and thus, to the total angular momentum of quarks. Hence, this transverse target spin asymmetry is a key observable to study the contribution of the orbital angular momentum of quarks to the spin of the proton. This talk will report on the preliminary measurement of the transverse target spin asymmetry of exclusive rho^0 mesons on a polarized hydrogen target at HERMES using the 27.6 GeV HERA positron beam. Since the factorization theorem is proved for longitudinally polarized photons only, a matter of theoretical interest is the asymmetry of rho^0 mesons induced from longitudinal photons. The rho^0 electroproduction data supports the fact that the s-channel helicity conservation holds to a good accuracy. This implies that a longitudinally polarized vector meson originates from a longitudinal polarized photon. Assuming the s-channel helicity conservation, the longitudinal polarization component of the rho^0 production is obtained experimentally through its decay angular distribution. The first measurement of the longitudinal component of the transverse target spin asymmetry of exclusive rho^0 mesons will be presented and compared to theoretical calculations. Strong Interactions makins@uiuc.edu
447 The HERMES Collaboration Measurement of Coherent and Incoherent Deeply Virtual Compton Scattering at HERMES from Nuclear Targets For the first time, azimuthal beam-spin asymmetries have been measured in electroproduction of a hard exclusive photon on nuclei ranging from Deuterium to Xenon. The data were accumulated by the HERMES experiment at HERA/DESY in the years 1996-2004 by scattering the 27.6 GeV lepton beam off an internal gas target. The asymmetries of the coherent and incoherent processes for D, 4He, N, Ne, Kr and Xe have been extracted and compared to the proton beam-spin asymmetry as a function of the Mandelstam variable t. The dependence on the atomic number A of the ratio of the beam-spin asymmetry on nuclei to that on the proton is evaluated and compared to GPD model predictions. Strong Interactions makins@uiuc.edu
448 The HERMES Collaboration New Global Fit to the F_2 Structure Function Inclusive proton DIS cross sections have been measured precisely by both collider and fixed target experiments. However, a fit of the structure function F_2 which is self-consistent with respect to the knowledge of R=sigma_L/sigma_T is not available. A fit is presented which fulfills this requirement based on a phenomenological parameterization first used by ALLM including newer data available. Furthermore, an acurate method to consider normalization uncertainties is applied and detailed information is provided about parameter and fit uncertainties. Strong Interactions makins@uiuc.edu
449 The HERMES Collaboration Final Results from HERMES on the Nuclear Dependence of Pion, Kaon, and Proton Formation A series of semi-inclusive deep-inelastic scattering measurements on deuterium, helium, neon, krypton and xenon targets has been performed in order to study the hadronization process and its modifications within the environment of a heavy nucleus. The data were collected with the HERMES detector at the DESY laboratory using a 27.6 GeV positron or electron beam, and the results presented constitute the final ones from HERMES, including all data collected with nuclear targets. Hadron multiplicities on nucleus A relative to those on the deuteron, R_A^h, are presented for various hadrons (pi+, pi-, pi0, K+, K-, p and anti-p) as a function of the virtual photon energy nu, the fraction of this energy transferred to the hadron z, the photon virtuality Q^2 and the hadron transverse momentum squared p_t^2. For pions also two-dimensional distributions are presented. These indicate that the dependences of R_A^pi on nu and z can largely be described as a dependence on a single variable L_c, which is a combination of nu and z. High-Energy Nuclear Physics "My name is Naomi Makins, and I am the present Analysis Coordinator for the HERMES experiment. I am submitting all abstracts to your session with myself as contact person. We will select appropriate speakers once we learn which talks you have selected for presentation." makins@uiuc.edu
450 The HERMES Collaboration Measurement of the pT-broadening of Pions and Kaon Produced in Deep Inelastic Scattering from Heavy Nuclei The HERMES experiment (at DESY-Hamburg) uses a 27.6 GeV e+ or e- beam on a fixed gaseous target. By studying semi-inclusive deep inelastic scattering on nuclear targets the space-time evolution of hadronization can be studied. This process is ideal because of the absence of initial state interactions and, in the HERMES kinematics, hadronization most likely takes place inside the nucleus. p_t-broadening is the difference between the average transverse momentum of hadrons produced from a nuclear target and that from a deuterium target. This quantity is sensitive to the time/length scale of hadronization. The first measurement of the p_t broadening for different hadron types and nuclear targets is presented as a function of several kinematic variables. High-Energy Nuclear Physics makins@uiuc.edu
451 The HERMES Collaboration Determination of Delta g/g from HERMES Data on high-p_T Inclusive Charged Hadron Production HERMES has used a high statistics data sample of charged inclusive hadrons to measure double spin asymmetries as a function of p_T. From these asymmetries the gluon polarization Delta-g/g in the proton has been extracted in the kinematic region of p_T between 1 and 2 GeV, which corresponds to an average x_gluon in the range 0.2 - 0.3. The information on the background asymmetry and the subprocess kinematics has been obtained from a Leading Order Monte Carlo model and existing parametrizations of the spin dependent quark distributions. Values for Delta g/g have been calculated both as a function of the measured p_T and x. The results will be presented together with comparisons of the Monte Carlo and data and a study of the effects of varying the model's parameters. Strong Interactions "Sorry, this is my third attempt to transmit successfully our first abstract, on Delta G/G. I think I see the problem from the last two attempts: the form is interpreting less-than and greater-than symbols as HTML tags. To be sure this works, I've removed (almost) all Latex special characters from this abstract (and the other ones). If you would like proper Latex versions, please let me know ... and thank you for your consideration of all our abstracts!" makins@uiuc.edu
452 guenole BOURDAUD Gamma-jet physics with the ElectroMagnetic Calorimeter in ALICE experiment at LHC The ElectroMagnetic Calorimeter (EMCal) will improve the ALICE experiment performances for the high transverse momentum particle detection and in particular for the reconstruction of gamma-jet events. These events appear to be very interesting to probe the strongly interacting matter created in ultra-relativistic heavy ion collisions and the eventual quark gluon plasma state. Indeed, they may give information on the dense nuclear medium which induces the jet-quenching phenomenon : measuring the energy of the gamma and comparing it to that of the associated jet may provide a unique way to quantify the jet energy loss in the dense matter. The interest of gamma-jet studies in the framework of the quark gluon plasma physics will be discussed as well as a brief description of the ALICE experiment. A particular highlight will be stressed on the EMCal calorimeter. The detection of the gamma-jet events will be then presented using EMCal in ALICE experiment. High-Energy Nuclear Physics guenole.bourdaud@subatech.in2p3.fr
453 M.A. Thomson Particle Flow Calorimetry at the ILC The ILC e+e- collider is being designed to operate in the centre-of-mass range 0.5-1.0 TeV. The ILC physics programme of precision measurements places stringent requirements on the detector performance. Of these requirements the goal of a jet energy resolution of 30%/sqrt(E) is probably the most challenging. It is widely believed that particle flow calorimetry is the most promising approach to meeting this goal. In particle flow calorimetry the energy deposits from individual particles are identified. Particle flow calorimetry requires highly granular calorimeters and plays a major role in the design of a detector for the ILC. In this talk I will describe the ideas behind particle flow calorimetry and discuss the performance of the current reconstruction algorithms in the context of the ILC detector concepts. Detectors and Data Handling This is a substantial and important topic in the design of an ILC detector. If possible I would like to request a 30 minute presentation. thomson@hep.phy.cam.ac.uk
454 LHCb collaboration Ideas for the LHCb upgrade LHCb is considering the possibility to upgrade the experiment to be able to run at luminosities at least 10 times the design luminosity of 2.10^32 cm^-2s^-1. It will be shown that one of the first limitations for the present detector to profit from increased instantaneous luminosities is the hadron trigger. This has led to adopting a baseline option for the upgrade that is based on being able to transfer all zero-suppressed data into a CPU farm at the full 40 MHz crossing-rate of the LHC. A full software trigger is being studied to select events for off-line analysis, and first result will be presented. The consequences for the front-end electronics chain down to the CPU farm will be discussed. At these high luminosities the increased track multiplicity and radiation damage would require new detector R&D efforts, which will be described. Detectors and Data Handling Olivier.Schneider@epfl.ch
455 LHCb collaboration Status of the LHCb experiment The LHCb experiment is getting ready to exploit the first LHC collisions, and is planning to start its full physics programme as soon as high-energy proton-proton interactions are delivered. The overall status of the detector construction and installation will be reviewed. The strategy for the detector commissioning, calibration and alignment will be presented, together with a scenario for the first physics data taking. Detectors and Data Handling Olivier.Schneider@epfl.ch
456 The HERMES Collaboration New HERMES Measurement of DVCS Asymmetries with Respect to Transverse Target Polarization and Beam Charge Measurements of a variety of asymmetries attributed to the interference between the deeply virtual Compton scattering (DVCS) and Bethe-Heitler processes provide new constraints on the Generalized Parton Distributions. Azimuthal asymmtries in the exclusive electroproduction of real photons from a transversely-polarized target have been measured for the first time by the HERMES experiment. By comparing these asymmetries with model calculations, model-dependent constraints are obtained on the total angular momentum carried by quarks in the nucleon. From the same data set, a new result of enhanced precision for the beam-charge asymmetry, sensitive to the real part of the DVCS amplitude, will also be presented. Strong Interactions makins@uiuc.edu
457 Roland Garoby PLANS FOR UPGRADING THE CERN PROTON ACCELERATOR COMPLEX With the construction of the Large Hadron Collider in its final phase at CERN, it is now time to prepare for increasing its performance as much as possible and for preparing for the future needs of physics. A basic plan has been proposed by the working group on “Proton Accelerators of the Future”, using the input from an ad’hoc physics working group looking after “Physics Opportunities with Future Proton Accelerators”. Apart from upgrades in the LHC itself, mainly in the optics of the insertions, the proposal is to renew the injector complex and significantly improve its characteristics. In a first phase, a new 160 MeV H- linac (“Linac4”) will be built to replace the present 50 MeV proton linac (Linac2) and extensive consolidation will be made. In a second phase, the present 26 GeV PS and its set of injectors (Linac2 + PSB) are planned to be replaced with a ~50 GeV synchrotron (“PS2”) with a ~4 GeV superconducting proton linac (“SPL”) as injector. The SPS itself will be upgraded for injection at 50 GeV and for better performance with high brightness beams. These proposals will be described as well as their potential for other uses like a neutrino facility. Accelerator RD and Technology Roland.Garoby@cern.ch
458 Catalina Espinoza, Jose Bernabeu THE CAPABILITIES OF THE EC NEUTRINO BEAM WITH THE SPS UPGRADE The goal for future neutrino facilities is the determination of the U(e3) mixing and CP violation in neutrino oscillations. This will require precision experiments with a very intense neutrino source and energy control. With this objective in mind, the creation of monochromatic neutrino beams from the electron capture decay of boosted ions by the SPS of CERN has been proposed. We discuss the capabilities of such a facility as a function of the enrgy of the boost and the basline for the detector. We conclude that the SPS upgrade to 1000 GeV is crucial to reach a better sensitivity to CP violation iff it is accompanied by a longer baseline. We compare the physics potential for two different configurations: I) gamma=90 and gamma=195 (maximum achievable at present SPS) to Frejus; II) gamma=195 and gamma=440 (maximum achievable at upgraded SPS) to Canfranc. The main conclusion is that, whereas the gain in the determination of U(e3) is rather modest, setup II) provides much better sensitivity to CP violation. Neutrino Physics M.Catalina.Espinoza@uv.es
459 V. Bernard, M. Oertel, E. Passemar, J. Stern Has a coupling of right-handed quarks to W been observed? The recent measurement of the $K\pi$ form factor in $K^L_{\mu 3}$ decays by the NA48 collaboration indicates a $5\sigma$ deviation with respect to the SM prediction based on the Callan-Treiman low-energy theorem. A possible explanation is a direct coupling of right-handed quarks to W. These couplings appear naturally in the minimal low-energy effective electroweak theory (LEET) at next-to leading order. At this order the LEET predicts related non-standard effects in the couplings to Z. I will show that coherent values emerge from an analysis of Z-pole observables, curing in particular the long-standing $A_{FB}^b$ puzzle. Flavour Physics and CP Violation "Another possible session would be ""physics beyond the standard model""" oertel@ipnl.in2p3.fr
460 D0 Collaboration Measurement of the W Boson Mass D0 presents the status of its precision measurements of the W-boson mass and width using 1 fb-1 of \sqrt{s}=1.96 TeV pp(bar) collision data collected with the D0 detector at the Fermilab Tevatron. High-Energy Electroweak Physics "rickv@fnal.gov,hobbs@fnal.gov,bolton@phys.ksu.edu"
461 D0 Collaboration D0 Jet Measurements Jet production mechanisms are studied in proton-antiproton collisions at center-of-mass energies of sqrt{s} = 1.96 TeV. The data analyzed were collected by the DO Experiment at the TeVatron and correspond to an integrated luminosity of about 1 fb-1. Jets are selected using an iterative cone algorithm with R_cone=0.7 and the results are compared to theoretical models within the framework of perturbative QCD. Strong Interactions "rickv@fnal.gov,hobbs@fnal.gov,odell@fnal.gov"
462 D0 Collaboration Studies of Dijet Angular Distributions Dijet angular distributions are studied in proton-antiproton collisions at center-of-mass energies of sqrt{s} = 1.96 TeV. Normalized shapes of dijet angular distributions, sensitive to new physics, have been studied as a function of dijet mass and compared with perturbative QCD predictions. Strong Interactions "rickv@fnal.gov,hobbs@fnal.gov,odell@fnal.gov"
463 J. Vidal, J. Bernabeu, G. A. Gonzalez-Sprinberg Electric dipole moment observable for tau production with polarized electron beam The mew proposal for a SuperB factory allows for a detailed study of CP violation in tau pair production. The tau electric dipole moment can be obtained from a CP-odd observable related to the spin density matrix of the taus. For a polarized electron beam, the normal polarization of the tau disentangles the electric dipole moment term. Its measurement would lead to a sensitivity orders of magnitude better than present bounds. Flavour Physics and CP Violation jorge.vidal@uv.es
464 AMS-Collaboration Cosmic-ray Astrophysics with the AMS-02 experiment Precise knowledge of the hadronic component of cosmic rays is needed to describe the cosmic ray production, acceleration and propagation mechanisms in our galaxy. Present measurements suffer from limitations coming from short exposure time, intrinsic instrumental limitations and restricted energy range. The AMS-02 experiment is a large acceptance magnetic spectrometer to perform high statistics studies of cosmic rays in space. The detector will operate on the International Space Station for more than 3 years. AMS-02 will precisely measure the cosmic ray fluxes of individual elements up to Z~25 in the rigidity range from ~1GV to ~1TV. Moreover, one solar cycle (11 yrs) duration spectra measurements of these elements with energy up to 25 GeV/nuc would be made possible. AMS-02 will allow to test propagation models through the precise measurements of secondary-to-primary ratios as D/p, 3He/4He in the energy range few hundreds MeV to tens of GeV, and B/C, sub-Fe/Fe up to ~1TV. In particular the original measurements of 10Be/9Be will be performed with high accuracy allowing the understanding of the age of the cosmic-ray confinement and constraint models of the size of the galactic halo. Astroparticle Physics, Gravitational Waves and Cosmology Bruna.Bertucci@pg.infn.it
465 AMS-Collaboration Astroparticle Physics with AMS-02 The Alpha Magnetic Spectrometer (AMS) will provide data on cosmic radiations in a large range of rigidity from 0.5 GV up to 2 TV. The main physics goals in the astroparticle domain are the anti-matter and the dark matter searches. The potential discovery of the primordial anti-matter by AMS-02 is presented emphasizing the completeness of the AMS-02 detector for these searches: the expected signal in AMS02 is presented and compared to results from present and forthcoming experiments. The e+, antiproton, anti-deuteron and gamma channels will contribute to the dark matter detection studies. The supersymmetric theory frame is considered as well as different astrophysical aspects related to the measurements on astrophysical sources or diffuse radiations. The expected flux sensitivities in 3 year exposure for the e+/e- ratio, anti-deuteron and antiproton yields as a function of energy are presented and compared to other direct and indirect searches. Astroparticle Physics, Gravitational Waves and Cosmology Bruna.Bertucci@pg.infn.it
466 Ian Tomalin b-Tagging at CMS Many of the interesting particles expected at the LHC, such as SUSY, Higgs bosons and top quarks, decay to b quarks. This paper presents the methods used to identify b-jets at CMS. The algorithms exploit the long B hadron lifetime, the leptons from B hadron decay and the jet kinematics. The performance of these methods is compared, and examples of their use, notably in the CMS high-level trigger are presented. Prospects for measuring the b tag performance directly from CMS data are examined. Detectors and Data Handling I.R.Tomalin@rl.ac.uk
467 Wolfram Erdmann Vertex reconstruction at the CMS experiment Due to the high track multiplicity expected in proton collisions at the LHC , vertex reconstruction will be a very challenging task. Vertex reconstruction can be decomposed into a pattern recognition phase (‘‘vertex finding’’) and an estimation phase (‘‘vertex fitting’’). Several non-linear algorithms have been developed in this context to improve the robustness of least-square algorithms. An overview of the algorithms used in the Tracker of the CMS experiment, and some of their respective features will discussed. Properties, results and performance of these algorithms with simulated data will be shown. Strong Interactions wolfram.erdmann@psi.ch
468 D0 Collaboration Measurement of the W+c Fraction in pp(bar) Collisions at sqrt(s) = 1.96 TeV We describe a measurement of the ratio of the pp(bar) -> W+c+jets to the pp(bar) -> W + jets cross sections, where W -> mu nu or W -> e nu. The W+c final state is directly sensitive to the strange quark PDF. The analysis is performed with a data sample corresponding to about 1 fb^{-1} of integrated luminosity collected by the D0 detector at the Tevatron collider. Strong Interactions "rickv@fnal.gov,hobbs@fnal.gov,odell@fnal.gov"
469 Wolfram Erdmann Vertex reconstruction at the CMS experiment Due to the high track multiplicity expected in proton collisions at the LHC , vertex reconstruction will be a very challenging task. Vertex reconstruction can be decomposed into a pattern recognition phase (‘‘vertex finding’’) and an estimation phase (‘‘vertex fitting’’). Several non-linear algorithms have been developed in this context to improve the robustness of least-square algorithms. An overview of the algorithms used in the Tracker of the CMS experiment, and some of their respective features will discussed. Properties, results and performance of these algorithms with simulated data will be shown. Detectors and Data Handling The first submission of the talk wolfram.erdmann@psi.ch
470 Valery Andreev Heavy flavor production studies in CMS At the LHC new opportunities to improve our understanding of the physics of the b-quark will become available because of the high statistics data samples and the high center-of-mass energy that the new accelerator will provide. The CMS collaboration will measure the cross section for inclusive b-quark production in proton-proton collisions at 14 TeV. A study has been performed to investigate methods of identifying b-jets (b "tagging") in an inclusive sample of events containing jets and at least one muon. We present the CMS capability to measure the inclusive b-quark production cross section as a function of transverse momentum and pseudorapidity. Strong Interactions ursl@phys.ethz.ch
471 Thomas Speer Heavy flavor studies in CMS The Compact Muon Solenoid (CMS) is a multi-purpose detector which will be operated at the Large Hadron Collider (LHC) at CERN. Its excellent tracking system, combined with low transverse momentum muon trigger capabilities, allow excellent studies of heavy flavor decays. The capabilities of the CMS experiment in this field have been studied in several benchmark processes which are representative of exclusive B physics analysis. They allow to study the capability of CMS to identify, select and reconstruct the decay of the b-flavoured hadrons, which presents a significant challenge due to their relatively low momentum and high background. After a brief description of the detector, the trigger system and the trigger strategy envisaged for B physics, several heavy flavor analyses in CMS, based on full detector simulation, will be presented. The decay Bs->J/psi phi allows to measure difference between the widths of the two weak eigenstates, and the rare leptonic decay Bs->mu+mu- is an excellent probe for new physics. Further analysis topics include the measurement the Bc mass and lifetime. Flavour Physics and CP Violation Talk on behalf of CMS collaboration. ursl@phys.ethz.ch
472 The CMS and TOTEM Collaborations The CMS and TOTEM diffractive and forward physics program: studies for high-luminosity running The combination of the CMS and TOTEM detectors at the LHC provides an unprecedented coverage in pseudo-rapidity at a hadron collider. The two collaborations intend to carry out a joint diffractive and forward physics program. This program spans from studying fundamental aspects of soft QCD via inclusive single-diffraction and inclusive double-Pomeron exchange, to studying diffraction in the presence of a hard scale, to using central exclusive production as a tool for discovery physics. Also possible is a rich program on low-x physics, where Bjorken x values as low as 10^-6 to 10^-7 are within reach. This would complement and greatly extend studies of gluon saturation at HERA and RHIC. At high luminosities, larger than approximately 10^3 cm-2s-1, two outstanding experimental problems need addressing: trigger and pile-up. We demonstrate that it is possible to operate a diffractive trigger stream up to luminosities of about 2 x 10^33 cm-2s-1. We also assess the size of the diffractive pile-up background and discuss the tools to keep it under control. Strong Interactions Also submitted to the High-Energy Electroweak Physics session. Note that a complementing abstract has been submitted on the more TOTEM-related aspects of the CMS-TOTEM joint program. monika.grothe@cern.ch
473 The CMS and TOTEM Collaborations The CMS and TOTEM diffractive and forward physics program: studies for high-luminosity running The combination of the CMS and TOTEM detectors at the LHC provides an unprecedented coverage in pseudo-rapidity at a hadron collider. The two collaborations intend to carry out a joint diffractive and forward physics program. This program spans from studying fundamental aspects of soft QCD via inclusive single-diffraction and inclusive double-Pomeron exchange, to studying diffraction in the presence of a hard scale, to using central exclusive production as a tool for discovery physics. Also possible is a rich program on low-x physics, where Bjorken x values as low as 10^-6 to 10^-7 are within reach. This would complement and greatly extend studies of gluon saturation at HERA and RHIC. At high luminosities, larger than approximately 10^3 cm-2s-1, two outstanding experimental problems need addressing: trigger and pile-up. We demonstrate that it is possible to operate a diffractive trigger stream up to luminosities of about 2 x 10^33 cm-2s-1. We also assess the size of the diffractive pile-up background and discuss the tools to keep it under control. High-Energy Electroweak Physics Also submitted to the Strong Interactions session. Note that a complementing abstract has been submitted on the more TOTEM-related aspects of the CMS-TOTEM joint program. monika.grothe@cern.ch
474 J.A.O.Marinho and T. Frederico Three-Boson Systems in Light-Front Dynamics We apply the quasi-potential approach to project the dynamics of three bosons to the Light-Front. We use a bosonic Yukawa model, and after we explore a contact interaction between the bosons, obtained in the limit when the exchanged boson mass goes to infinity. We show the systematic expansion of quasi-potential approach to project the Bethe-Salpeter equation to the light-front, and the mechanism by which the two and three-body reducible diagrams are subtracted out from the kernel of the integral equations, avoiding double counting. We obtain in a systematic way both the kernel of the integral equation for the valence component of the light-front wave function, and the next-to-leading order contribution to the kernel of the integral equation for the transition matrix. We show as well how the full 4-dimensional Bethe-Salpeter amplitude can be reconstructed from the valence Light-Front wave function. High-Energy Nuclear Physics adnei@ita.br
475 The CMS and TOTEM Collaborations The CMS and TOTEM diffractive and forward physics program: Studies of proton measurement and physics potential in low-luminosity running The combination of the CMS and TOTEM detectors at the LHC provides an unprecedented coverage in pseudo-rapidity at a hadron collider. In addition, by running at several different LHC optics settings, large and complementary acceptancies for scattered protons are obtained. The two collaborations intend to carry out a joint diffractive and forward physics program. This program spans from studying fundamental aspects of soft QCD via inclusive single-diffraction and inclusive double-Pomeron exchange, to studying diffraction in the presence of a hard scale, to using central exclusive production as a tool for discovery physics. Furthermore the charged particle and energy flow in the forward direction as well as low-x physics to Bjorken x values as low as 10^-6 to 10^-7 can be studied. A detailed study of the measurement precision of the scattered proton kinematics is presented both for standard, high-luminosity LHC optics and for a few special low-luminosity optics configurations. We also discuss trigger scenarios, event reconstruction and rates for a number of different processes for the same optics configurations. Strong Interactions Also submitted to the High-Energy Electroweak Physics session. Note that a complementing abstract has been submitted on the more CMS-related aspects of the CMS-TOTEM joint program. kenneth.osterberg@helsinki.fi
476 The CMS and TOTEM Collaborations The CMS and TOTEM diffractive and forward physics program: Studies of proton measurement and physics potential in low-luminosity running 477 The combination of the CMS and TOTEM detectors at the LHC provides an unprecedented coverage in pseudo-rapidity at a hadron collider. In addition, by running at several different LHC optics settings, large and complementary acceptancies for scattered protons are obtained. The two collaborations intend to carry out a joint diffractive and forward physics program. This program spans from studying fundamental aspects of soft QCD via inclusive single-diffraction and inclusive double-Pomeron exchange, to studying diffraction in the presence of a hard scale, to using central exclusive production as a tool for discovery physics. Furthermore the charged particle and energy flow in the forward direction as well as low-x physics to Bjorken x values as low as 10^-6 to 10^-7 can be studied. A detailed study of the measurement precision of the scattered proton kinematics is presented both for standard, high-luminosity LHC optics and for a few special low-luminosity optics configurations. We also discuss trigger scenarios, event reconstruction and rates for a number of different processes for the same optics configurations. High-Energy Electroweak Physics Also submitted to the Strong Interactions session. Note that a complementing abstract has been submitted on the more CMS-related aspects of the CMS-TOTEM joint program. kenneth.osterberg@helsinki.fi
477 A. David (for the CMS collaboration) High Density QCD Physics with Heavy Ions in CMS The LHC will collide protons at $\sqrt{s}$=14 TeV and lead beams at $\sqrt{s_{NN}}$=5.5 TeV as well as possibly other AA and pA combinations. The physics program of the Compact Muon Solenoid (CMS) includes the study of heavy ion collisions, where the collision energy, higher than at RHIC, will allow the study of the dense partonic system with hard probes. A broad palette of these probes, ranging from heavy quarks and quarkonia with an emphasis on $J/\psi$ and $\upsilon$, W$^{\pm}$ and Z$^0$ bosons, high-p$_{T}$ jets and photons, will be within the reach of CMS and their production is likely to be modified, relative to pp collisions, by the presence of the hot medium. In this talk we will overview the physics reach and unique abilities of CMS in studying the medium produced in heavy-ion collisions at the LHC. High-Energy Nuclear Physics Email given is that of the convener of the CMS Heavy Ion Physics Group. wyslouch@MIT.EDU
478 CMS Collaboration (contact J.D'Hondt) Study of Flavour Changing Neutral Currents in Top Quark Decays with the CMS Detector A study based on fully simulated and reconstructed events to estimate the sensitivity of the CMS experiment to Flavour Changing Neutral Currents (FCNC) in top quark decays is presented. The non-Standard Model decays t-->qZ and t-->qgamma (where q represents c or u quarks) are investigated in pp collisions at sqrt(s)=14 TeV exploiting leptonic Z decays or the photon signature. The most important systematic effects are addressed. As a result we estimate to be sensitive to FCNC decays at the five sigma discovery limit for branching ratios as low as BR(t-->qZ) = 15*10-4 and BR(t-->qgamma) = 8.4*10-4, allowing some models of new physics to be probed. High-Energy Electroweak Physics jodhondt@vub.ac.be
479 CMS Collaboration (contact J.D'Hondt) Potential for measuring the top quark mass with CMS at the LHC The mass of the top quark is a crucial parameter both for the Standard Model and for models beyond this. Due to the large Yukawa coupling of the top quark, this mass is a key parameter in testing the electroweak and Higgs sector of the Standard Model. The precise measurement of the top quark mass is one of the main physics goals in understanding the interactions between the elementary particles. The Large Hadron Collider will collect an enormous amount of top quark pair events allowing to measure the top quark mass to an unprecedented precision dominated by systematic uncertainties in the jet definition. Top quark mass estimators are constructed and their robustness versus several systematic uncertainties is optimized to reach conservatively a potential precision of better than 2 GeV which extrapolates to 1 GeV with a better understanding of the physics of proton collisions at the LHC and the CMS detector. High-Energy Electroweak Physics jodhondt@vub.ac.be
480 CMS Collaboration (contact J.D'Hondt) Study of single top-quark production with the CMS detector The production of single top quarks at the LHC provides a unique opportunity for the measurement of the CKM matrix element |Vtb| without assuming 3 generation unitarity. We present selection strategies for all three production mechanisms: via t- and s-channel and the W-associated production. Perspectives for these measurements with the CMS detector are discussed based on full detector simulation Monte Carlo samples and detailed studies of systematic effects. High-Energy Electroweak Physics jodhondt@vub.ac.be
481 CMS Collaboration (contact J.D'Hondt) Potential of measuring the spin correlations in top quark pair events with CMS at the LHC The measurement of correlation between spins of top and anti-top quarks, produced in proton-proton collisions at LHC, is described for the semi-leptonic decay of the top quark pair. The simulated events are reconstructed after full simulation of the CMS detector. The spin correlation coefficient is estimated based on a total integrated luminosity of ten inverse femtobarns. Including systematic uncertainties, the correlation coefficient can be measured with a total relative uncertainty of 17% or 27% depending on the choice of the decay angles used. High-Energy Electroweak Physics jodhondt@vub.ac.be
482 CMS Collaboration (contact J.D'Hondt) Potential of measuring the top quark pair cross section with CMS at the LHC Measuring the cross section for top quark pair production at the LHC provides an essential test of the Standard Model. This process which has a high and rather well calculable cross section can be considered as a standard candle measurement at the LHC providing interesting physics and and an ideal tool to prepare for discoveries. The Large Hadron Collider will collect an enormous amount of top quark pair events events which will, among others, allow to measure the top quark mass via the measurement of the cross section of the process. An event selection is applied on the detailed simulated data providing an event sample with a high signal-to-noise ratio. Cross section estimators are constructed which are therefore robust for deviations in the predicted cross section of the background processes. It will be shown that the potential relative uncertainty on the cross section is quickly dominated by systematic uncertainties related to the knowledge of the b-tagging performance and the estimation of the integrated luminosity. High-Energy Electroweak Physics jodhondt@vub.ac.be
483 CMS Collaboration Study of Di-Boson Production with the CMS Detector at LHC The relatively high cross sections and the clean signature of multi-lepton final states make the pp->ZZ->e+e-e+e- and pp->WZ->3l (l=e,mu) processes accessible in early CMS data. The CMS potential for the observation and study of these processes is assessed using fully-simulated signal and background Monte Carlo samples. The main systematic effects relevant for cross section measurements with 1 and 10 inverse femtobarn of data are addressed. We demonstrate that multiple gauge-boson production in proton-proton collisions at LHC energies can be observed in the early phase of the experiment, with an integrated luminosity of 1 inverse femtobarn or less. High-Energy Electroweak Physics Roberto.Tenchini@cern.ch
484 D0 Collaboration Measurement of Triple Differential Photon Plus Jet Cross Section A measurement of the triple differential cross section for the process pp(bar) -> gamma + jet + X is presented. This measurement is based on a data sample collected with an integrated luminosity of about 1.1 fb-11 between September 2002 - February 2006 by the D detector at the FermilabTevatron pp(bar) Collider running at sqrt(s) =1.96 TeV. The events selected for analysis contain photons with transverse momenta in the range of 30-300 GeV and pseudorapidities of |eta_gam|<1.0 and a leading jet with transverse momentum pT > 15 GeV. In these events, jet pseudorapidities are limited to lie within the ranges |eta_jet| < 0.8 or 1.5 < |eta_jet| j< 2.5. The dependence of the cross section on the photon transverse momentum for di erent photon and jet rapidity regions is compared with the next leading order QCD predictions using the CTEQ6.1M parameterizations of parton distribution functions. Strong Interactions "rickv@fnal.gov,hobbs@fnal.gov,odell@fnal.gov"
485 Hau-Bin Li (on behalf of the TEXONO Collaboration) Search of Neutrino Magnetic Moments with a High-Purity Germanium Detector at the Kuo-Sheng Nuclear Power Station The TEXONO Collaboration has been pursuing a research program on low energy neutrino physics [1] at the Kuo Sheng Reactor Neutrino Laboratory in Taiwan. We report on the final results [2] of our studies on neutrino magnetic moments (\mu_{\nu}) and radiative decay lifetimes with a high-purity germanium detector. Limits of \mu_{\nu}<7.4X10^{-11} \mu_B were derived at a physics threshold of 12 keV and a background level of ~1 /day-keV-kg, comparable to underground dark matter experiments. The experimental details will be reported. Our future goal of developing a 100-eV threshold detector for neutrino-nucleus coherent scattering and dark matter searches [3] will be discussed. 1. H.T. Wong, Mod. Phys. Lett. A 19, 1207 (2004). 2. H.B. Li et al., Phys. Rev. Lett. 90, 131802 (2003); H.T. Wong et al., Phys. Rev. D 75, 012001 (2007). 3. H.T. Wong et al., J. Phys. Conf. Ser. 39, 266 (2006). Neutrino Physics Presenting Author's email : lihb@phys.sinica.edu.tw htwong@phys.sinica.edu.tw
486 D.Binosi, J. Bernabeu, J.Papavassiliou CP violation through particle mixing and the H-A lineshape We consider the possibility of looking for CP-mixing effects in two-Higgs doublet models (and particularly in the MSSM) by studying the lineshape of the CP-even (H) and CP-odd (A) neutral scalars. In most cases H and A come quite degenerate in mass, and their s-channel production would lead to nearly overlapping resonances. CP-violating effects may connect these two Higgs bosons, giving origin to one-loop particle mixing, which, due to their mass proximity, can be resonantly enhanced. The corresponding transition amplitude contains then CP-even and CP-odd components; besides the signal of intereference between both amplitudes, leading to a CP-odd asymmetry, we propose to look for the mixing probability itself, a quantity which, although CP-even, can originate only from a CP-odd amplitude. We show that, in general, the effect of such a mixing probability cannot be mimicked by (or be re-absorbed into) a simple redefinition of the H and A masses in the context of a CP-conserving model. Specifically, the effects of the CP-mixing are such that, either the mass-splitting of the $H$ and $A$ bosons lies outside the range allowed by the theory in the absence of CP-mixing, and/or the detailed energy dependence of the produced lineshape is clearly different from the one obtained by redefining the masses, but not allowing any mixing. This analysis suggests that the detailed study of the lineshape of this Higgs system may provide valuable information on the CP nature of the underlying theory. Physics Beyond the Standard Model "Published in JHEP 0609:023,2006. e-Print: hep-ph/0604046" Joannis.Papavassiliou@uv.es
487 D.Binosi, J.Bernabeu, J.Papavassiliou CP violation through particle mixing and the H-A lineshape We consider the possibility of looking for CP-mixing effects in two-Higgs doublet models (and particularly in the MSSM) by studying the lineshape of the CP-even (H) and CP-odd (A) neutral scalars. In most cases H and A come quite degenerate in mass, and their s-channel production would lead to nearly overlapping resonances. CP-violating effects may connect these two Higgs bosons, giving origin to one-loop particle mixing, which, due to their mass proximity, can be resonantly enhanced. The corresponding transition amplitude contains then CP-even and CP-odd components; besides the signal of intereference between both amplitudes, leading to a CP-odd asymmetry, we propose to look for the mixing probability itself, a quantity which, although CP-even, can originate only from a CP-odd amplitude. We show that, in general, the effect of such a mixing probability cannot be mimicked by (or be re-absorbed into) a simple redefinition of the H and A masses in the context of a CP-conserving model. Specifically, the effects of the CP-mixing are such that, either the mass-splitting of the H and A bosons lies outside the range allowed by the theory in the absence of CP-mixing, and/or the detailed energy dependence of the produced lineshape is clearly different from the one obtained by redefining the masses, but not allowing any mixing. This analysis suggests that the detailed study of the lineshape of this Higgs system may provide valuable information on the CP nature of the underlying theory. Physics Beyond the Standard Model "Published in JHEP 0609:023,2006. e-Print: hep-ph/0604046 Note: This is the second submission of the same paper, correcting typographical errors in the Abstract." Joannis.Papavassiliou@uv.es
488 D.Binosi, J.Papavassiliou Non-perturbative Pinch Technique We present the non-perturbative implementation of the pinch technique. In particular, in the context of scalar QED, we derive the pinch technique self-energies and vertices directly from the Schwinger-Dyson equations. After reviewing the perturbative construction, we discuss in detail the general methodology and the basic field-theoretic ingredients necessary for the completion of this task. The construction requires the simultaneous treatment of the equations governing the scalar self-energy and the fundamental interaction vertices. The resulting non-trivial rearrangement of terms generates dynamically the Schwinger-Dyson equations for the corresponding Green's functions of the background field method. The proof relies on the extensive use of the all-order Ward-identities satisfied by the full vertices of the theory and by the one-particle-irreducible kernels appearing in the usual skeleton expansion. The general strategy for the generalization of the method in a non-Abelian context is briefly outlined. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry "Published in JHEP 0703:041,2007. e-Print: hep-ph/0611354" Joannis.Papavassiliou@uv.es
489 A.C.Aguilar, J.Papavassiliou Effective gluon mass and the freezing of the strong coupling We report on a special type of solutions for the gluon propagator of pure (quark-less) QCD, obtained from the corresponding non-linear Schwinger-Dyson equation formulated in the background field method. These solutions are free of the Landau singularity, and reach a finite value in the deep IR. They may be successfully fitted by a massive propagator, with the crucial characteristic that the effective ``mass'' employed is not hard, but depends non-trivially on the momentum transfer, vanishing sufficiently fast in the deep ultraviolet. In addition, one may define a dimensionless quantity, which constitutes the generalization in a non-Abelian context of the universal (process-independent) QED effective charge. This strong effective charge displays asymptotic freedom in the ultraviolet whereas in the low-energy regime it freezes at a finite value, giving rise to an infrared fixed point for QCD. Strong Interactions "Based on work in progress, see also JHEP 0612:012,2006 (hep-ph/0610040)" Joannis.Papavassiliou@uv.es
490 BaBar Collaboration Search for resonant contributions in the decays B to D Dbar K We report on the search for (ccbar) or (csbar) resonances contributing to the exclusive decays B0/B0bar, B+/B- to Dbar(*)D(*)K+- and B0/B0bar, B+/B- to Dbar(*)D(*)K0s. We study the properties of the decays B to Ds1(2536)+ D(*)bar and B to Psi(3770)K. We present also a search for the the decays B to X(3872)K and B to DsJ(2700)+ Dbar. Branching fractions or limits are given for all these decays, except for those involving DsJ(2700), where a more thorough study is needed. Flavour Physics and CP Violation jolsen@princeton.edu
491 BaBar Collaboration Study of the Xi(1690) Resonance in Charm Baryon Decay at BaBar The Cascade(1690) resonance is studied in exclusive charm baryon decays obtained from a total integrated luminosity of about 200 fb^{-1} recorded with the BaBar detector at the asymmetric-energy B-factory at SLAC. Fits to the Lambda Kbar lineshapes observed in the exclusive processes Lambda_c+ -->Lambda K0bar K+ and Cascade_c0 -->Lambda K- pi+ yield mass and width values for the Cascade(1690)^{0} and the Cascade(1690)^- respectively, while the Lambda K0bar decay angular distribution provides information on the Cascade(1690) spin. The process Cascade_c+ --> Lambda K0bar pi+ is studied also, but, as predicted, no Cascade(1690)^{0} signal is observed. Flavour Physics and CP Violation jolsen@princeton.edu
492 BaBar Collaboration D0-D0bar mixing with semi-leptonic decays Using about 300 fb^{-1} of Babar data we search for D0-D0bar mixing in the self-tagging semi-electronic decay mode D*+ -> pi+ D0, D0 -> K(*) e \nu (and c.c.). The charm parent opposite the semi-electronic decay is fully reconstructed in five highly pure hadronic decay modes to provide an additional uncorrelated flavor tag. The time-integrated mixing rate is extracted from fits to the mixed and unmixed M(D*)-M(D0) distribution binned in several D0 lifetime ranges. Flavour Physics and CP Violation jolsen@princeton.edu
493 BaBar Collaboration Measurement of CP asymmetry in B0->K+K-K0 decays We present measurements of CKM phase beta and a study of the 3-body final state in penguin-dominated B^0->K^+K^-K^0 decays, using a dataset collected with the BABAR detector. We reconstruct both K^+K^-K_S and K^+K^-K_L final states and report values of CP asymmetry parameters and Dalitz plot amplitudes for the combined sample. As these decays in many theory models receive significant contribution from new physics amplitudes we compare our measurements with standard model predictions. Flavour Physics and CP Violation jolsen@princeton.edu
494 BaBar Collaboration Measurement of CP asymmetry in B0->KSKSKS decays We present measurements of CP asymmetry in b->s penguin-dominated B^0->K_S K_S K_S decays, using a dataset collected with the BABAR detector. The final state is reconstructed from two or three KS->pi+pi- and at most one KS->pi0pi0 decay candidates. We report values of CP asymmetry parameters for the inclusive 3-body decay and its branching fraction. If significant deviations from standard-model predictions are found in any of these parameters, it will mean that these loop-dominated decays receive contribution from new physics amplitudes. Flavour Physics and CP Violation jolsen@princeton.edu
495 BaBar Collaboration Measurement of CP asymmetry in B0->pi0pi0KS decays We present measurements of the CP asymmetry in penguin-dominated B->pi0pi0KS decays, using a dataset collected with the BABAR detector at the PEP-II e+e- storage ring operating at the Y(4S) resonance. We report the branching fraction and the CP asymmetry parameters for the 3-body decay. If significant deviations from standard-model predictions are found in any of these parameters, it will mean that these loop-dominated decays receive contribution from new physics amplitudes. Flavour Physics and CP Violation jolsen@princeton.edu
496 BaBar Collaboration Measurement of Decay Amplitudes of B->ccbar K* with an Angular Analysis, for (ccbar)=J/psi, psi(2S) and chi_c1 We perform the first full measurement of the decay amplitudes of $\B\to\psitwos\Kstar$ and $\B\to\chicone\Kstar$ and update our previous measurement for $\B\to\jpsi\Kstar$. We use a data sample collected with the \babar\ detector at the \pep2\ storage ring, representing 232 million produced \BB\ pairs. The longitudinal polarization of decays to $1^{--}$ \ccbar mesons is observed to decrease with their mass, while that of the decay to \chicone is larger. Flavour Physics and CP Violation jolsen@princeton.edu
497 BaBar Collaboration Search for resonant decays in $B\to XK^*, X\to J/\psi\pi\pi$ We present here a study of $B \to XK^{*}$ with $X \to J/\psi\pi\pi$ produced in approximately 280$fb^{-1}$ of $e^{+}e^{-}$ annihilations near 10.6 $GeV/c^{2}$. The search was carried out with data recorded by the BaBar experiment operating at the PEP-II asymmetric energy storage rings. Flavour Physics and CP Violation jolsen@princeton.edu
498 BaBar Collaboration A Dalitz Plot analysis of D0 -> K- K+ pi0 decays Using 385 fb${}^{-1}$ of $e^+e^-$ collision data collected with the BaBar detector, we study the amplitudes of the singly Cabibbo-suppressed decay $D^0\rightarrow K^-K^+\pi^0$ by analyzing the Dalitz plot distribution. We measure the strong-phase difference between the $\bar{D^0}$ and $D^0$ decays to $K^*(892)^{+} K^-$ and their amplitude ratio. We also perform a partial wave analysis of the $K^-K^+$ system in a limited mass range. Flavour Physics and CP Violation jolsen@princeton.edu
499 BaBar Collaboration Search for mixing in D0 -> K+pi-pi0 The results of searches for D0-antiD0 mixing in the decay of D0->K+pi-pi0, using 340 fb-1 of e+e- collisions collected from the BaBar detector at the PEP-II storage ring at SLAC, are presented. The analysis consists of a full time-dependent Dalitz Plot fit to extract the mass and lifetime difference. Flavour Physics and CP Violation jolsen@princeton.edu
500 BaBar Collaboration Search for lepton-flavour-violating tau decays at BaBar Neutrinoless lepton flavor violating tau decays have since long been identified as unambiguous signature of new physics. We report on the searches for tau -> lll, tau -> lhh, tau -> l KS0 decays. We also report on the searches for lepton and baryon number violating decays tau -> Lambda(bar) pi and tau -> Lambda(bar) K, which can either conserve or violate (B-L). Physics Beyond the Standard Model jolsen@princeton.edu
501 BaBar Collaboration Study of color suppressed decays B0 to D(*)0 h0 Using a sample of 383 million $\Upsilon(4S)\to B\bar{B}$ events collected with the \babar\ detector at the PEP-II asymmetric-energy $e^{+}e^{-}$ storage ring, located at the Stanford Linear Accelerator Center, we measure the branching fractions of the eight color-suppressed B-meson decays B^0 bar to D^{(*)0}\pi^{0}$, D^{(*)0}\omega$,D^{*0}\eta$ and D^{(*)0}\eta^{\prime}. This measurement updates and supersedes the previous babar measurement, which was based on a statistics of about 80 millions B\bar B pairs. Flavour Physics and CP Violation jolsen@princeton.edu
502 BaBar Collaboration Study of Excited Charm-Strange Baryons We present a study of the excited charm-strange baryon spectrum produced in e+ e- annihilations at or near a center-of-mass energy of 10.58 GeV, in a data sample with an integrated luminosity of 383.8 fb-1 recorded with the BABAR detector at the PEP-II asymmetric-energy e+ e- storage ring at the Stanford Linear Accelerator Center. We study strong decays of charm-strange baryons to the final states Lambda_c+ K- pi+, Lambda_c+ Ks pi-, Lambda_c+ K_s, Lambda_c+ K-, Lambda_c+ Ks pi- pi+, and Lambda_c+ K- pi+ pi-. We measure masses and widths of excited charm-strange baryons, as well as estimate statistical significances. We also determine yields and production cross-sections times branching fractions. Flavour Physics and CP Violation jolsen@princeton.edu
503 BaBar Collaboration Measurement of B to Ds(*) h h decays We report on the measurement of $B^- \to D^{(*)+}_s K^- \pi^-$, $\bar{B^0} \to D_s^{(*)+} K^0_S \pi^-$ and $B^- \to D^{(*)+}_s K^- K^-$ decays in 388 million $\Upsilon(4S) \to B \bar{B}$ events collected by the BaBar detector at the PEP-II asymmetric-energy $B$-factory. Flavour Physics and CP Violation jolsen@princeton.edu
504 BaBar Collaboration Maeasurement of the decays B to D^(*)_(s) p pbar n(pi) We report on the measurement of the decays $B \to D^{(*)} p \bar{p} n(\pi)$ and the search for $B \to D^+_s p \bar{p} \pi^-$ using 388 million $\Upsilon(4S) \to B \bar{B}$ events collected by the BaBar detector at the PEP-II asymmetric-energy $B$-factory. Flavour Physics and CP Violation jolsen@princeton.edu
505 BaBar Collaboration Analysis of B+ to D(*)- pi+ pi+ decays We report on the analysis of $B^-$ mesons decaying into $D^{*+} \pi^-\pi^-$ and $D^+\pi^-\pi^-$ final states using 383 million $B^-$ decay collected by the BABAR detector at the PEP-II asymmetric-energy B Factory. Measurements are given for the inclusive branching fractions for $B^- \to D^{*+} \pi^- \pi^-$ and $B^- \to D^+ \pi^-\pi^-$, and for the exclusive branching fractions for $B^- \to D_J^0 \pi^- \to D^+ \pi^- \pi^-$, where $D_J^0$ is the $c\bar{u} P-wave state. Flavour Physics and CP Violation jolsen@princeton.edu
506 BaBar Collaboration Study of Omegac0 We present an analysis of inclusive Omega_c^0 baryon production and decays in 230.5 fb^-1 of data recorded with the BABAR detector at the PEP-II asymmetric-energy e+ e- collider at the Stanford Linear Accelerator Center. Omega_c^0 baryons are reconstructed in four final states (Omega- pi+, Omega- pi+ pi0, Omega- pi+ pi+ pi-, Xi- K- pi+ pi+) and the ratios of branching fractions for these final states are measured. We also measure the momentum spectrum of the Omega_c^0 baryons in the e+ e- center-of-mass frame. From the spectrum, we observe Omega_c^0 production from B decays and in ccbar events, and extract the two rates of production. Flavour Physics and CP Violation jolsen@princeton.edu
507 BaBar Collaboration Evidence for D0-D0bar Mixing in D0 -> K+ pi- We present evidence for D0-anti-D0 mixing in D0 --> K+pi- decays from 384 fb^{-1} of e+e- colliding-beam data recorded near sqrt(s) 10.6 GeV with the BaBar detector at the PEP-II storage rings at SLAC. Flavour Physics and CP Violation jolsen@princeton.edu
508 BaBar Collaboration Measurement of B to LambdaC pbar n(pi) We report on the measurement of $B \to \Lambda_c \bar{p} n(pi)$ decays in 388 million $\Upsilon(4S) \to B \bar{B}$ events collected by the BaBar detector at the PEP-II asymmetric-energy $B$-factory. Flavour Physics and CP Violation jolsen@princeton.edu
509 BaBar Collaboration Study of Exclusive B Decays into Final States with two Charmed Baryons We present measurements of the decays $B^- \rightarrow \Xi_c^0 \overline{\Lambda}_c^-$, $\overline{B}^0 \rightarrow \Xi_c^+ \overline{\Lambda}_c^-$, $B^- \rightarrow \Lambda_c^+ \overline{\Lambda}_c^- K^-$, and $\overline{B}^- \rightarrow \Lambda_c^+ \overline{\Lambda}_c^- K_s^0$ based on 228 million $\Upsilon(4S) \rightarrow B \overline{B}$ decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. We report measured branching fractions for these processes. Flavour Physics and CP Violation jolsen@princeton.edu
510 BaBar Collaboration Dalitz Plot Analysis of D0 -> Ks pi+ pi- We present a Dalitz plot analysis of the hadronic decay D0 -> Ks pi+ pi- in data recorded with the BABAR detector at the PEP-II asymmetric-energy e+ e- collider at the Stanford Linear Accelerator Center. The K-matrix formalism is applied to the S-wave pi+ pi- distribution, which is characterized by broad, overlapping resonances. We discuss the results and compare the results to the Isobar model. Flavour Physics and CP Violation jolsen@princeton.edu
511 BaBar Collaboration Study of the Xi(1530)0 Resonance We present a study of the properties of the Xi(1530)0 resonance, observer in Lambda_c+ -> Xi- pi+ K+ decays. The spin of the Xi(1530)0 is shown to be 3/2. We investigate the presence of an S-wave amplitude in the Xi- pi+ system and its interference with the Xi(1530)0. Flavour Physics and CP Violation jolsen@princeton.edu
512 BaBar Collaboration Measurement of the B- -> D*0e-nu decay and determination of |V_{cb}| We present a measurement of the semileptonic decay $B^-\to{}D^{*0}e^-\bar{\nu}_e$ using about 226 million $B\bar{B}$-pairs accumulated on the $\Upsilon(4S)${} resonance by the BABAR detector at the asymmetric $e^{+}e^{-}$ collider PEP II. Using a recent form factor parametrization, we measure the product $\mathcal{F}(1)|V_{cb}|$ of the CKM-matrix element $|V_{cb}|$ and the form factor $\mathcal{F}$ at maximal momentum transfer to the lepton pair, the only parameter $\rho_{A_1}2$ of the form factor $\mathcal{F}$ and the branching fraction $\mathcal{B}(B^-\to{}D^{*0}e^-\bar{\nu}_e)$. Flavour Physics and CP Violation jolsen@princeton.edu
513 BaBar Collaboration Measurement of Partial Branching Fraction for Inclusive Charmless Semileptonic B Decays, Extraction of |V_{ub}| and determination of non-perturbative OPE parameters from the Hadronic Mass Spectrum We study charmless semileptonic decays, $B \rightarrow X_u \ell \bar{\nu}$, in events where the decay of the second B meson is fully reconstructed. The study is based on 383 million $B \overline{B}$ pairs recorded with the BaBar detector. Distributions of various kinematic variables characterising $B \righarrow X_u \ell \bar{\nu}$ decays are studied. Partial branching fractions $\Delta {\mathcal B} (B \righarrow X_u \ell \bar{\nu})$ are measured in kinematic regions where the dominant background from semileptonic $B \righarrow X_c \ell \bar{\nu}$ Decays is reduced. The CKM matrix element $|V_{ub}|$ is extracted by using theoretical calculations of phase space acceptances. Furthermore, we determine the spectrum of the hadronic system $X_u$ after unfolding for acceptance and detector effects. From an analysis of the first three truncated spectral moments we determine the value of the $b$-quark mass $m_b$ together with the leading parameters of the $1/m_b^2$ and $1/m_b^3$ terms in the OPE. Flavour Physics and CP Violation jolsen@princeton.edu
514 BaBar Collaboration Measurement of the Partial Branching Fraction for B0 --> Xu l nu decays and limits on Isospin Breaking in Inclusive Charmless Semileptonic B decays using tagged B0 events. We present a measurement of the $B^0 \righarrow X_{u} \ell^- \bar{\nu}$ partial branching fraction just below the kinematic endpoint of the lepton energy spectrum using a large sample of $B^0$-meson decays in events tagged through a partial reconstruction of the ${\overline B}^0 \righarrow D^{*+}\ell+ {\nu}$ decays. From this measurement we extract a limit on the isospin breaking contribution in inclusive charmless semileptonic B decays. Flavour Physics and CP Violation jolsen@princeton.edu
515 BaBar Collaboration Study of the exclusive semileptonic decays B->Xu l nu using the neutrino reconstruction We report on a study of the exclusive charmless semileptonic B-meson decays $B \rightarrow \pi/\pi^0 \ell \nu$ and $B \rightarrow \rho/\rho^0 \ell \nu$ based on 383 million $B \overline{B}$ pairs recorded with the BaBar detector at the $\Upsilon(4S)$ resonance. The selection is based on a neural-net approach and the signal is extracted in a simultaneous maximum-likelihood fit to all four signal modes. We measure the total and partial branching fractions for these decays in six bins of $q^2$, the momentum-transfer squared, for $B \rightarrow \pi \ell \nu$ and three bins for $B \rightarrow \rho \ell \nu$. We compare the measured distribution in $q^2$ with theoretical calculations for the form factors from lattice QCD and light-cone sum rules and extract the CKM-matrix element $|V_{ub}|$. Flavour Physics and CP Violation jolsen@princeton.edu
516 BaBar Collaboration Measurement of the Inclusive Hadronic-Mass and Energy spectrum in the B-->Xc l nu decays. We present a measurement of moments of the inclusive hadronic mass and energy spectrum in semileptonic $B \to X_c \ell \nu$ decays. This study is based on a sample of 231 million $\Upsilon(4S)\to B \overline{B}$ decays recorded by the BABAR detector at the PEP II $e^+e^-$-storage rings. We reconstruct the semileptonic decay by identifying a lepton in events tagged by a fully reconstructed hadronic decay of the second B meson. We measure moments for different minimal lepton momenta between 0.8 and 1.9$\,\mathrm{GeV}/c$. These are predicted in the framework of a Heavy Quark Expansion (HQE), which allows the extraction of the total semileptonic branching fraction, the CKM-matrix element $|V_{cb}|$, and the quark masses $m_b$ and $m_c$, together with the dominant non-perturbative HQE parameters occuring in the expansion up to the order $1/m_b^3$. Flavour Physics and CP Violation jolsen@princeton.edu
517 BaBar Collaboration Measurement of the hadronic form factors in D_s-->phi e+ nu decays We study the D_{s}^+ \rightarrow \phi e^+ \nu_e$ decay using data corresponding to $81.6 fb^{-1}$ recorded by the BaBar detector at the PEPII electron-positron collider. Using a simple pole ansatz for the $q^2$ dependence of the hadronic form factors, their ratios $r_V=V(0)/A_1(0)$ and $r_2=A_2(0)/A_1(0)$ have been determined at $q^2=0$. We have also measured the relative branching fraction $BR(D_s^+ \rightarrow \phi e^+ \nu_e)/BR(D_s^+ \rightarrow \phi \pi^+)$. Flavour Physics and CP Violation jolsen@princeton.edu
518 BaBar Collaboration Measurement of exclusive B -> Xu l nu branching fractions on the Recoil of Fully Reconstructed B Mesons We present measurements of the exclusive charmless semileptonic decays $B^0\rightarrow\pi^-l^+\nu$, $B^+\rightarrow\pi^0 l^+\nu$, $B^0\rightarrow\rho^-l^+\nu$, $B^+\rightarrow\rho^0 l^+\nu$, $B^+\rightarrow\omega l^+\nu$, y $B^+\rightarrow\eta l^+\nu$ and $B^+\rightarrow\eta^' l^+\nu$. We use a data sample of \sim 383 M of $B\overline{B}$ pairs, collected with the BaBar detector at the PEP-II asymmetric energy $e^+e^-$ collider at SLAC. We use a recoil technique in which one of the two $B$ mesons from a $\Upsilon(4S)$ decay is fully reconstructed. The semileptonic decay of the other B meson is identified by the presence of a charged lepton. We report results on total and partial branching fractions and on the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element $V_{ub}$. Flavour Physics and CP Violation jolsen@princeton.edu
519 BaBar Collaboration Measurement of B -> [D,D*,D**,D(*)pi] l nu branching ratios with a Large Sample of Tagged B Mesons We report on a measurement of the branching fractions for B semileptonic decays into charmed meson final states based on a large sample of $BB$ pairs collected with the BaBar detector at the PEP-II asymmetric energy $e^+e^-$ collider at SLAC. We use a recoil technique in which one of the two $B$ mesons from a $\Upsilon(4S)$ decay is fully reconstrucuted in hadronic modes. We measure the branching fractions for these decays, and we perform a combined fit on various kinematic variables of candidate $B\rightarrow D^{**}\ell\nu$ decays to determine constraints on the decay form factors using a HQET-inspired parametrization. Flavour Physics and CP Violation jolsen@princeton.edu
520 BaBar Collaboration Determination of the Form Factors for the Decay B0 ---> D*- l+ nu(l) and of the CKM Matrix Element |V(cb)| We present a combined measurement of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$ and of the parameters $\rho^2$, $R_1$, and $R_2$, which fully characterize the form factors of the $B^0 \to D^{*-}\ell^{+}\nu_\ell$ decay in the framework of HQET. The results are based on a selected sample of about 52,800 $B^0 \to D^{*-}\ell^{+}\nu_\ell$ decays, recorded by the BABAR detector. Flavour Physics and CP Violation jolsen@princeton.edu
521 BaBar Collaboration Measurement of the Hadronic Form Factor in D0 --> K- e+ nue Decays The shape of the hadronic form factor f+(q2) in the decay D0 --> K- e+ nue has been measured in a model independent analysis and compared with theoretical calculations. We use 75 fb(-1) of data recorded by the BABAR detector at the PEPII electron-positron collider. Flavour Physics and CP Violation jolsen@princeton.edu
522 BaBar Collaboration Measurement of the Relative Branching Fractions of Bbar --> D/D*/D** l^- anti-nu_l Decays in Events with a Fully Reconstructed B Meson We determine the relative branching fractions of semileptonic B decays to charmed final states. The measurement is performed on the recoil from a fully reconstructed B meson in a sample of 362 million BBbar pairs collected at the Upsilon(4S) resonance with the BaBar detector. A simultaneous fit to a set of discriminating variables is performed on a sample of Bbar --> D X l^- anti-nu_l decays to determine the contributions from the different channels. Flavour Physics and CP Violation jolsen@princeton.edu
523 BaBar Collaboration Measurement of $\gamma$ with B0->D0K*0, D0->Kspipi We present a new analysis for extracting the angle $\gamma$ of the Unitarity Triangle from the study of the neutral B meson decays. We reconstruct the decay channel $\Bz \rightarrow \Dzb(\Dz) \Kstarz$ ($\Bzb \rightarrow \Dz(\Dzb) \Kstarzb$) with the $\Kstarz \rightarrow K^{+}\pi^{-}$ ($\Kstarzb \rightarrow K^{-}\pi^{+)$) and the $\Dzb(\Dz) \rightarrow K_{S}\pi^{+}\pi^{-}$ decay modes using a \Dz\ Dalitz analysis technique. Using a sample of $353 \mbox{fb}^{-1}$ collected with \babar\ detector at PEP II, we measure the angle $\gamma$ as a function of the decay amplitude ratio $r_B (\Dz \Kstarz) = \frac{{\cal A}(\Dz {K}^{*0})}{{\cal A}(\Dzb {K}^{*0})}$. The measurement of $\gamma$ is then obtained by combining this result with the available information on $r_B$. Flavour Physics and CP Violation jolsen@princeton.edu
524 BaBar Collaboration Measurement of 2beta+gamma with time-dep analysis of B0->D+K0 pi- We present the time-dependent Dalitz analysis of the $B0 \rightarrow D^{\pm} K0 \pi^{\mp}$ decays for the measurement of the combination of weak phases $ 2 \beta + \gamma$ using a sample of approximately 347 million $B \overline B$ pairs collected by the BaBar detector at the PEP-II asymmetric energy storage ring. The amplitudes and phases for the $V_{cb}$ contributions are also extracted from the fit. Flavour Physics and CP Violation jolsen@princeton.edu
525 BaBar Collaboration Improved measurement of B- ->D(*)0K(*)- decays We present a study of the decays $B^\mp\to D^{(*)0}K^{(*)\mp}$, where $D0$ is reconstructed in a variety of CP eigenstates and double Cabibbo suppressed decays, based on a sample of about 380 million Upsilon(4S)->BBbar decays collected with the BaBar detector at the PEP-II e+e- storage ring. The decay rates give information useful to constrain the Cabibbo-Kobayashi-Maskawa angle $\gamma$. Flavour Physics and CP Violation jolsen@princeton.edu
526 BaBar Collaboration Measurement of gamma with B->D(*)0K(*)-, D0->Kspipi decays We present a measurement of the Cabibbo-Kobayashi-Maskawa CP-violating phase $\gamma$ with a Dalitz plot analysis of neutral D meson decays to the K0s h- h+ final state (h=\pi, K) from $B^\mp \to D^{(*)} K^\mp$ and $B^\mp \to D K^{*\mp}$ decays, using a sample of about 380 million BBbar pairs collected by the \babar\ detector at the SLAC PEP-II B-Factory. Flavour Physics and CP Violation jolsen@princeton.edu
527 BaBar Collaboration A Study of B0 to rho+rho- Decays and the Measurement of the CKM Angle alpha We present results from an analysis of B0 to rho+rho- decays using 384 million Y(4S) to BBbar decays collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We determine the unitarity triangle angle alpha, using an isospin analysis of B to rhorho decays. Flavour Physics and CP Violation jolsen@princeton.edu
528 BaBar Collaboration B meson decay branching fractions and CP-violation charge asymmetries for two-body final states eta(K+,pi+), eta'(K,pi+), and omega(K,pi+) We present measurements of the branching fractions for B0 meson decays to eta' K0 and omega K0 and of the branching fractions and CP-violation charge asymmetries for B+/- meson decays to eta pi+/-, eta K+/-, eta' pi+/-, eta' K+/-, omega pi+/-, and omega K+/-. The data, collected with the \babar\ detector at the Stanford Linear Accelerator Center, represent 384 million BBbar pairs produced in e+e- annihilation. Flavour Physics and CP Violation jolsen@princeton.edu
529 BaBar Collaboration Search for B meson decays to K1pi final states We present measurements of the branching fractions of neutral $B$ meson decays to K1(1270)Pi and K1(1400)Pi with a sample of 384 million \BB\ pairs collected with the \babar\ detector at the \pep2 asymmetric-energy \epem collider at SLAC. Flavour Physics and CP Violation jolsen@princeton.edu
530 BaBar Collaboration Search for Neutral B-Meson Decays to a0pi, a0K, etarho0, and etaf0 We present a search for B0 decays to charmless final states involving an eta meson, a charged pion and a second charged pion or kaon. The data sample corresponds to 383x10^6 BBbar pairs collected with the BABAR detector operating at the PEP-II asymmetric-energy B Factory at SLAC. Flavour Physics and CP Violation jolsen@princeton.edu
531 BaBar Collaboration Search for B+ meson decays to an (a1pi)+ final state We present measurements of charged B-meson decays to a_1(1260) pi using data collected with the BABAR detector at the SLAC PEP-II asymmetric B factory. Flavour Physics and CP Violation jolsen@princeton.edu
532 BaBar Collaboration Study of B to phiK* decays With a sample of about 384 million BBbar pairs recorded with the BABAR detector we perform an amplitude analysis of the B->phiK*(892) decays. Overall, twelve parameters are measured for vector-vector decays, including the fractions of longitudinal and parity-odd transverse amplitudes, branching fraction, strong phases, and six parameters sensitive to CP-violation. We use the dependence on the Kpi invariant mass of the interference between the JP=1- and 0+ non-resonant Kpi components to resolve the discrete ambiguity in the determination of the strong and weak phases. Flavour Physics and CP Violation jolsen@princeton.edu
533 BaBar Collaboration Search for B0 to phi(Kpi) decays with large Kpi invariant mass We search for the decays B0 to phi Kpi with large Kpi invariant mass. The analysis is based on a sample of 384 million BBbar pairs recorded with the BaBar detector. Flavour Physics and CP Violation jolsen@princeton.edu
534 BaBar Collaboration Search for B to b1pi or b1K decays We present a search for B decays to charmless final states involving a charged B-meson decays to a neutral b_1(1235) and a charged pion or kaon, and neutral B-meson decays to a charged b_1(1235) and an oppositely charged pion or kaon. The data sample corresponds to 383x10^6 BBbar pairs collected with the BABAR detector operating at the PEP-II asymmetric-energy B Factory at SLAC. Flavour Physics and CP Violation jolsen@princeton.edu
535 BaBar Collaboration Measurement of CP Violating Asymmetries in B0 -> pi+pi- and K+pi- We present observations of CP violation in the decays B0 -> K+pi- and B0 -> pi+pi- in a sample of 383 million Y(4S) -> BBbar events collected with the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC. Flavour Physics and CP Violation jolsen@princeton.edu
536 BaBar Collaboration Search for new charmless hadronic B meson decays In a data sample of more than 383 million BBbar pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC we search for charmless hadronic B meson decays with higher mass intermediate states recoiling against a kaon. Flavour Physics and CP Violation jolsen@princeton.edu
537 BaBar Collaboration Time-Dependent Study of of B0 -> K0 pi0 decays We present a measurement of the time-dependent CP-violating asymmetries in B0 -> K0S pi0 decays based on 383 million Y(4S) -> BBbar events collected by the BABAR experiment at the PEP-II asymmetric-energy B Factory at SLAC. We measure the direct CP-violating asymmetry C_{K0S pi0} and the CP-violating asymmetry in the interference between mixing and decay S_{K0S pi0}, as well as the branching fraction of B(B0 -> K0 pi0) decays. Flavour Physics and CP Violation jolsen@princeton.edu
538 BaBar Collaboration Measurement of BR and ACP of B->hpi0 and B0->pi0pi0 decays We present an updated study of B+ -> h+ pi0 and B0->pi0pi0 based on 383 million Y(4S) -> BBbar events collected by the BABAR experiment at the PEP-II asymmetric-energy B Factory at SLAC. We measure the branching fractions for the modes B0->pi0pi0, B+ -> pi+pi0, and B+ -> K+pi0, and the direct CP asymmetries C_pi0pi0, A_CP(pi+pi0), and A_CP(K+pi0) Using related BaBar measurements and isospin relations we determine an upper bound on the angle difference |delta| = |alpha - alpha_eff|. Flavour Physics and CP Violation jolsen@princeton.edu
539 BaBar Collaboration Study of $b\to d \gamma$ Transitions Making use of a sum of exclusive final states with up to three charged pions and one neutral pion or eta, we have demonstrated that it is possible to measure the ratio of the inclusive rates $b\to d \gamma$ and $b \to s \gamma$. This provides information on $|V_{td}/V_{ts}|$ that is complementary to using the exclusive modes $B \to \rho \gamma$ and $B \to K^* \gamma$. Flavour Physics and CP Violation jolsen@princeton.edu
540 BaBar Collaboration Measurements of the Branching Fractions and Asymmetries of $B \to K^* \gamma$ Decays We present measurements of the branching fractions and asymmetries of the radiative penguin process $B\to K^* \gamma$, using a sample of $B \overline B$ pairs collected on the $\Upsilon(4S)$ resonance by the BaBar experiment. In the Standard Model, direct CP-violating and isospin-violating asymmetries of these decays are expected to be small, but could be significantly enhanced by new physics at the electroweak scale. Flavour Physics and CP Violation jolsen@princeton.edu
541 BaBar Collaboration Search for the Radiative Decays $B\to \Lambda \bar{p} \gamma$ and $B\to \Sigma^0 \bar{p} \gamma$ We report the results of a search for the radiative baryonic decays $B\to \Lambda \bar{p} \gamma$ and $B\to \Sigma^0 \bar{p} \gamma$ in a sample of 380 million $B$ decays recorded at the $\Upsilon(4S)$ resonance of the PEP-II facility with the BaBar detector. We present branching fractions for these channels and investigate mass and angular distributions of the di-baryon system, which provide insight into the decay mechanism. Flavour Physics and CP Violation jolsen@princeton.edu
542 BaBar Collaboration Measurement of the $B \to X_s \gamma$ Branching Fraction and Photon Energy Spectrum We present a measurement of the branching fraction and photon energy spectrum for the decay $B \to X_s \gamma$. This measurement uses approximately 750,000 $B\overline{B}$ events that are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson an isolated high-energy photon is identified. The small contribution from $B \to X_d\gamma$ is subtracted using theoretical predictions. The full reconstruction of one of the B mesons results in improved background suppression and allows for an inclusive measurement of the photon energy spectrum in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies and use them to extract the heavy quark parameters $m_b$ and $\mu_{\pi}^2$. In addition, a measurement of the direct CP asymmetry $A_{CP}(B \to X_{s+d} \gamma)$ is presented. Flavour Physics and CP Violation jolsen@princeton.edu
543 BaBar Collaboration Measurements of $B \to X_s \gamma$ Decays from a Fully-Inclusive Photon Sample The photon spectrum in the $B \to X_{s} \gamma$ decay, where $X_{s}$ is any strange hadronic state, is studied using a data sample of $B\bar{B}$ decays collected with the BaBar experiment. The spectrum is used to measure the partial branching fractions and the first and second moments for different $E_\gamma$ thresholds above 1.9 GeV. The moments are fitted to recent theoretical calculations to extract the parameters $m_{b}$ and $\mu_{\pi}^2$ and to extrapolate the partial branching fraction measurement down to a photon energy of 1.6 GeV. In addition, the direct CP asymmetry $A_{CP}(B \to X_{s+d}\gamma)$ is measured. Flavour Physics and CP Violation jolsen@princeton.edu
544 BaBar Collaboration Study of $B\to K^*ll$ Decays Measurements of the FCNC decay $B\to K^*ll$ allow for sensitive tests of the Standard Model due to possible New Physics contributions in the interference between penguin and box diagrams. Results from BaBar on the forward-backward lepton asymmetry and $K^*$ polarization are presented. The study of additional angular variables and the extension of the analysis to inclusive $b\to sll$ decays are also discussed. Flavour Physics and CP Violation jolsen@princeton.edu
545 BaBar Collaboration Study of $B$ Meson Decays to $\eta K \gamma$ Final States We present measurements of the branching fraction and integrated CP asymmetry for charged $B$ meson decays to $\eta K \gamma$, and the branching fraction and time-dependent CP asymmetry for neutral $B$ meson decays to $\eta K^0 \gamma$. Our measurements are based on data collected with the BaBar detector at the PEP-II asymmetric-energy $e^+e^-$ collider at SLAC. Flavour Physics and CP Violation jolsen@princeton.edu
546 BaBar Collaboration Study of the Exclusive Process $e+e- \rightarrow \phi\eta$ at 10.6 GeV at BaBar We present a study of the exclusive reaction $e^+e^- \rightarrow \phi \eta$ at $\sqrt{s}=10.58$ GeV using 24$\pm$5 signal events in the $K^+K^-\gamma\gamma$ final state selected from 224 fb$^{-1}$ of BaBar data. This reaction is analogous to double charmonium reactions, such as $J/\psi \eta_c$, that have been seen at unexpectedly high rates. We find angular distributions consistent with annihilation via a single photon, and measure the cross section and set a limit on $\Upsilon(4S)$ decays into this final state. Our result combined with a previous measurement at lower energy favors a $1/s^3$ over $1/s^4$ dependence of the cross section. Strong Interactions jolsen@princeton.edu
547 BaBar Collaboration Study of the Exclusive Process $e^+e^- \rightarrow \rho^+\rho^-$ at 10.6 GeV at BaBar We present a study of the exclusive reaction $e^+e^- \rightarrow \rho^+\rho^-$ at $\sqrt{s}=10.58$ GeV using 308$\pm$25 signal events in the $\pi^+\pi^-\pi^0\pi^0$ final state selected from 379 fb$^{-1}$ of BaBar data. This complements our previous study of the $\rho^0\rho^0$ intermediate state, which cannot be produced in single-photon annihilation. Here we find angular distributions consistent with single-photon annihilation and measure the three possible helicity amplitudes, which provide a direct text of QCD. The cross section is similar in magnitude to that for $\rho^0\rho^0$, despite the very different production process. Strong Interactions jolsen@princeton.edu
548 BaBar Collaboration Correlated Leading Baryon-Antibaryon Production in $e^+e^- \rightarrow c\bar{c} \rightarrow \Lambda^+_c \bar{\Lambda}^-_c X$ We present a study of 649$\pm$31 $e^+e^- \rightarrow c\bar{c}$ events containing both a $\Lambda^+_c$ baryon and a $\bar{\Lambda}^-_c$ antibaryon selected from 220 fb$^{-1}$ of BaBar data at $\sqrt{s}=10.6$ GeV. This is roughly 4.2 times the number of events expected if the leading charmed hadron types are uncorrelated. These events contain very few additional baryons, indicating a previously unobserved type of $e^+e^- \rightarrow q\bar{q}$ event in which the primary $q$ and \qbar are contained in a correlated baryon and antibaryon and there are multiple intermediate mesons. Distributions of momentum, angle, rapidity and $c$-baryon type are similar to those in typical hadronic events, but these events contain fewer kaons and vector mesons. On average, we oberve 2.6$\pm$0.2 charged mesons, carrying 65\% of the non-\Lc/\Lcb energy. Events with these qualitative features are predicted by the UCLA hadronization model. Strong Interactions jolsen@princeton.edu
549 BaBar Collaboration Study of the Processes $e^+e^- \rightarrow K\overline{K}\pi/\eta$ Using Initial State Radiation at BaBar We present a new study of the processes $e^+e^- \rightarrow \gamma e^+e^- \rightarrow \gamma K^+K^-\pi^0$, $\gamma K^+K^-\eta$, $\gamma K^+K^0_s\pi^-$ and $\gamma K^0_sK^-\pi^+$, where $\gamma$ is a hard radiative photon, using 231 fb$^{-1}$ of BaBar data at an $e^+e^-$ center-of-mass energy of 10.6 GeV. We find a rich substructure in these events and extract cross sections for several intermediate states. We observe the $J/\psi$ and/or $\psi(2S)$ in several of these modes and measure the corresponding branching fractions. Strong Interactions jolsen@princeton.edu
550 BaBar Collaboration Study of the Process $e^+e^- \rightarrow \pi^+\pi^-\pi^0\pi^0$ Using Initial State Radiation at BaBar We present a new study of the process $e^+e^- \rightarrow \gamma e^+e^- \rightarrow \gamma \pi^+\pi^-\pi^0\pi^0$, where $\gamma$ is a hard radiative photon, using 231 fb$^{-1}$ of BaBar data at an $e^+e^-$ center-of-mass energy of 10.6 GeV. We measure the cross section for this process over the range of equivalent $e^+e^-$ c.m.\ energies from threshold to 5.0 GeV, with precision better than previous experiments. We find a rich substructure in these events and extract cross sections for several intermediate states. In particular we study the energy dependence of the $\rho^+\rho^-$ intermediate state, which we have previously studied at 10.6 GeV. We also study the charmonium region and report relevant branching fractions. Strong Interactions jolsen@princeton.edu
551 BaBar Collaboration Study of the Processes $e^+e^- \rightarrow K^+K^-\pi^+\pi^-$, $K^+K^-\pi^0\pi^0$ and $K^+K^-K^+K^-$ Using Initial State Radiation at BaBar We present improved studies of the processes $e^+e^- \rightarrow \gamma e^+e^- rightarrow gamma K^+K^-\pi^+\pi^-$, and $\gamma K^+K^-K^+K^-$ and the first study of the process $e^+e^- rightarrow \gamma K^+K^-\pi^0\pi^0$, where $\gamma$ is a hard radiative photon, using 232 fb$^{-1}$ of BaBar data at $e^+e^-$ center-of-mass energy of 10.6 GeV. We measure the cross sections for these processes over the range of equivalent $e^+e^-$ c.m.\ energies from threshold to 5.0 GeV, with normalization uncertainties of 7--14\%. We find a rich substructure in these events and extract cross sections for several intermediate states. In particular we study the threshold behavior of the $\phi f_0(980)$ cross section near threshold, where we have previously reported a structure, in detail. We observe the $J/\psi$ and/or $\psi(2S)$ in several of these modes and measure branching fractions. We do not observe the $Y(4260)$ in any mode, and the upper limit on its decay rate to $\phi\pi\pi$ excludes some models. Strong Interactions jolsen@princeton.edu
552 BaBar Collaboration Study of the Process $e^+e^- \rightarrow \pi^+\pi^-\pi^+\pi^-\pi^0$ Using Initial State Radiation at BaBar We present a new study of the process $e^+e^- \rightarrow \gamma e^+e^- \rightarrow \gamma\pi^+\pi^-\pi^+\pi^-\pi^0$, where $\gamma$ is a hard radiative photon, using 231 fb$^{-1}$ of BaBar data at an $e^+e^-$ center-of-mass energy of 10.6 GeV. We measure the cross section for this process over the range of equivalent $e^+e^-$ c.m.\ energies from threshold to 5.0 GeV, with precision better than previous experiments. We find a rich substructure in these events and extract cross sections for several intermediate states. We also study the charmonium region and report relevant branching fractions. Strong Interactions jolsen@princeton.edu
553 BaBar Collaboration An Inclusive Measurement of $\delta\alpha^5_{\rm Had}$ using Radiative Return at BaBar We present a preliminary inclusive measurement of $\delta\alpha^5_{\rm Had}$, the hadronic contribution to the running of the fine structure constant, at BaBar using initial state radiation (ISR) in $e^+e^-$ interactions to explore the whole range of effective center-of-mass energies from threshold up to 7 GeV. Current knowledge of the $e^+e^- \rightarrow$ hadrons cross section in this region limits the precision of theoretical predictions of the value of $\alpha$ at high momentum transfer, and hence of quantities such as the Higgs mass. The BaBar ISR data sample is considerably larger than existing direct $e^+e^-$ energy scan data over most of this energy range, and there are systematic advantages to the ISR technique that allow significantly improved precision on the integral of the cross section, which is used for the calculation of $\delta\alpha^5_{\rm Had}$. Strong Interactions jolsen@princeton.edu
554 BaBar Collaboration Branching fraction and charge asymmetry measurements in {$B \to J/\psi \pi \pi$} decays We study the decays $B^0 \to J/\psi \pi^+ \pi^-$ and $B^+ \to J/\psi \pi^+ \pi^0$, including intermediate resonances, using a sample of 382 million $B \bar{B}$ pairs recorded by the BaBar detector at the PEP-II $B$ factory. Flavour Physics and CP Violation jolsen@princeton.edu
555 BaBar Collaboration Search for resonant structure in $B \to J/\Psi \phi K$ decays. We present a study of the $B^{\pm} \to J/\psi \phi K^{\pm}$ and $B^0 \to J/\psi \phi K_S$ decays using data recorded by the BaBar detector at the PEP-II $B$ factory. We determine an updated measurement of the branching fractions and we perform a search for a resonant structure decaying into $J/\psi \phi$. Flavour Physics and CP Violation jolsen@princeton.edu
556 BaBar Collaboration Exclusive B decays to multi-hadron final states in the charmonium region We present a study of the poorly known or never observed $B$ meson decays to a charmonium state $(c \bar c)$ and a $K^+$ or $K^{*0}$ meson, where $(c \bar c)$ is either the $\eta_c$ state, reconstructed in the $K_S K^\pm \pi^\mp$ and $K^+ K^- \pi^0$ decays, or the $h_c$ state, reconstructed in its decay to $\eta_c \gamma$. Data have been collected by the BaBar detector at the PEP-II $B$ factory. Flavour Physics and CP Violation jolsen@princeton.edu
557 BaBar Collaboration Inclusive search for bottomonium states in hadronic decays We present a search for the missing bottomonium states $\eta_b(nS)$ and $\chi_b(3P)$ using data collected by the BaBar detector at the PEP-II $B$ factory. The search is performed by inclusive reconstruction from radiative deexcitation of the $Y(4S)$ resonance, $Y(4S) \to (\eta_b(nS),\chi_b(3P)) \gamma$. Flavour Physics and CP Violation jolsen@princeton.edu
558 BaBar Collaboration Study of $Y(nS) \to \pi^+ \pi^- Y(mS)$ decays We report on a study of the $Y(2S) \to Y(1S) \pi^+ \pi^- $, $Y(3S) \to Y(1S) \pi^+ \pi^- $ and $Y(3S) \to Y(2S) \pi^+ \pi^- $ decays using data collected at the PEP-II $B$ factory by the BaBar detector. Branching fractions are measured and the $\pi^+ \pi^-$ invariant mass distribution is studied. Flavour Physics and CP Violation jolsen@princeton.edu
559 BaBar Collaboration Search for resonant decays in $B \to \psi(2S) \gamma K$ We present here a study of $B \to X(3872)K$ decays with $X(3872) \to \psi(2S) \gamma$. The search was carried out with data recorded by the BaBar experiment operating at the PEP-II asymmetric energy storage rings. Flavour Physics and CP Violation jolsen@princeton.edu
560 BaBar Collaboration Test of lepton universality in $\Upsilon$ decays We present measurements of the ratios of branching fractions $\mathcal{R}_{ll^\prime} = BR(\Upsilon(nS) \to l^+l^-)/BR(\Upsilon(nS) \to l^{\prime +}l^{\prime -})$ with $n<4$ and for all lepton flavors. Data have been collected with the BaBar detector at the PEP-II $B$ factory. Physics Beyond the Standard Model jolsen@princeton.edu
561 BaBar Collaboration Search for $J/\psi\omega$ resonance at BaBar. We provide an update of our search for $Y \to J/\psi \omega$ in $B^0 \to J/\psi \omega K_S$ and $B^{\pm} \to J/\psi \omega K^{\pm}$ decay modes, using an integrated luminosity of 348 fb$^{-1}$. A narrow resonance at near 3917 MeV is observed with a width. We measure the following branching fraction $BF(B^{\pm}\to Y K^{\pm}(Y\to J/\psi\omega)$. Flavour Physics and CP Violation jolsen@princeton.edu
562 BaBar Collaboration Branching Fraction Measurement of B+->K+K-pi+ We present a measurement of the B meson decay to the K+K-pi+ final state using a dataset collected with the BABAR detector. These strangness-conserving decays provide limits on the contribution of VubVus* amplitudes in penguin-dominated B0->phiK0 decays that affect measurement of CKM parameter sin(2beta). They also provide a limit VqdVqb*, q=c,t amplitudes in B0->rhopi which impact extraction of CKM angle alpha. Flavour Physics and CP Violation jolsen@princeton.edu
563 BaBar Collaboration Branching Fraction Measurement of B+->K+K-pi+ We present a measurement of the B meson decay to the K+K-pi+ final state using a dataset collected with the BABAR detector. These strangness-conserving decays provide limits on the contribution of VubVus* amplitudes in penguin-dominated B0->phiK0 decays that affect measurement of CKM parameter sin(2beta). They also provide a limit VqdVqb*, q=c,t amplitudes in B0->rhopi which impact extraction of CKM angle alpha. Flavour Physics and CP Violation jolsen@princeton.edu
564 BaBar Collaboration Measurement of time-dependent CP asymmetry in partially reconstructed B0->D*+D*- decays Based on a data sample collected with the BaBar detector at the PEP-II asymmetric-energy B factory at SLAC, we present a measurement of the time-dependent CP asymmetry in neutral B meson decays to D*+D*- using a partial reconstruction technique of the final state. Flavour Physics and CP Violation jolsen@princeton.edu
565 BaBar Collaboration Dalitz Plot Analysis of B+->K+pi-pi+ We present a Dalitz plot analysis of the B meson decay to the K+pi-pi+ final state using a dataset collected in 1999-2006 with the BABAR detector. We fit the Dalitz plot distribution using an isobar model and measure the magnitudes and phases of the decay coefficients. In addition we extract the branching fractions and direct CP-asymmetries for each resonance. Flavour Physics and CP Violation jolsen@princeton.edu
566 BaBar Collaboration Updated measurement of cos2beta using B0 --> J/psi K*0 [--> Kspi0] decays The sin2beta high precision measurement leaves a four-fold ambiguity on the angle beta itself. This ambiguity is reduced today to a two-fold ambiguity by the measurements of cos2beta. Using data collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we present an updated measurement of cos2beta using B0 --> J/psi K*0 [--> Kspi0] decays. Flavour Physics and CP Violation jolsen@princeton.edu
567 BaBar Collaboration Measurement of the Absolute Branching Fraction of D0 --> K- pi+ We measure the absolute branching fraction for D0 --> K- pi+ using partial reconstruction of B0bar --> D*+ l- nu-bar decays using a data sample of 230 million BBbar pairs. Flavour Physics and CP Violation jolsen@princeton.edu
568 BaBar Collaboration Improved Measurement of CP Violation in Neutral B Decays to ccbar s We present improved measurements of time-dependent CP asymmetries in fully-reconstructed neutral B decays to several CP eigenstates containing a charmonium meson. The measurements use a data sample of (383 +- 4) million Upsilon(4S) --> BBbar decays collected with the BABAR detector at the PEP-II $B$ factory. Flavour Physics and CP Violation jolsen@princeton.edu
569 BaBar Collaboration Measurement of CP-Violating Asymmetries in B0 --> D(*)+- D-+ We present improved measurements of CP-violating asymmetries in the decays B0 --> D*+- D-+ and B0 --> D+ D- using (383 +- 4) million BBbar pairs collected by the BABAR detector at the PEP-II B factory. Flavour Physics and CP Violation jolsen@princeton.edu
570 BaBar Collaboration Measurement of CP asymmetry in B0 --> D(*)0 h0 decays with a time-dependent Dalitz plot analysis of D0 --> Ks pi+ pi- We report a measurement of cos2beta and sin2beta in B0 --> D(*)0 h0 decays with a time-dependent Dalitz plot analysis of D0 --> Ks pi+ pi-, where h0 is pi0, eta, eta' or omega using 383 million BBbar pairs collected at the BABAR detector. The strong phase variation on the Dalitz plot provides the sensitivity to cos2beta. By determining the sign of cos2beta, we reduce the ambiguity of beta from four fold to two fold. Flavour Physics and CP Violation jolsen@princeton.edu
571 BaBar Collaboration Measurement of the Time-Dependent CP Asymmetry in B0 --> D(*)0h0 Decays We report a measurement of the time-dependent CP-asymmetry parameters S and C in color-suppressed B0 --> D(*)0h0 decays, where h0 is a pi0, eta, or omega meson, and the D0 decays to one of the CP eigenstates K+K-, Kspi0, or Ksomega. The data sample consists of 383 million Upsilon(4S) --> BBbar decays collected with the BABAR detector at the PEP-II asymmetric-energy B-factory at SLAC. Flavour Physics and CP Violation jolsen@princeton.edu
572 BaBar Collaboration Measurement of time-dependent CP asymmetry and CP-odd fraction in B0 --> D*+ D*- decays We present an updated measurement of time-dependent CP asymmetries and the CP-odd fraction in the B0 --> D*+ D*- decays using 383 million BBbar pairs collected by the BABAR detector at the PEP-II $B$ factory. We present the C ans S parameters for both CP-even and CP-odd components. Standard Model predicts C to be 0 and S to be -sin2beta in the absence of penguin amplitude contributions. Flavour Physics and CP Violation jolsen@princeton.edu
573 BaBar Collaboration Study of CP violation with partially reconstructed B0 --> D* l nu decays with kaon tags We present new precise measurements of CP violation in the neutral B-meson system, using partially reconstructed B0 --> D* l nu decays. Only the high-energy lepton and the charged soft pion from the decay D* --> pi D0 are reconstructed. The flavor of the other B is determined from the charge of another charged kaons in the event. The results are obtained from the data collected by BABAR. Flavour Physics and CP Violation jolsen@princeton.edu
574 BaBar Collaboration Observation of B+ -> rho+ K0 and Measurement of its Branching Fraction and Charge Asymmetry We present the first observation of the decay B+ -> rho+ K0, using a data sample collected with the BABAR detector. We report values of the branching fraction and charge asymmetry. These results can be used to test theoretical assumptions about penguin amplitudes and can also be used to determine the CKM angle gamma using U-spin symmetry. Flavour Physics and CP Violation jolsen@princeton.edu
575 BaBar Collaboration Leptonic B Decays at BaBar B-meson decays to leptonic final states are heavily suppressed in the Standard Model, and therefore provide useful probes for new physics effects. The experimental approaches employed vary depending on the nature of the particles in the final state. For those modes where all final state particles can be identified ($B^0\rightarrow\ell^+\ell^-$ and $B^0\rightarrow\ell^+\ell^-\gamma$) the signal decay can be completely reconstructed. For other channels, such as $B^+\rightarrow\tau^+\nu$, the necessary kinematic constraints do not exist, which dictates the full reconstruction of the accompanying $B$ meson in the process $e^+e^-\to\Ups(4S)\to $B\bar{B}$. This reconstruction can be done with semileptonic and/or hadronic final states, providing a clean ``recoil'' sample to study for consistency with the target decay channel. In the case of $B^+\rightarrow\tau^+\nu$, the signal is searched for in a subset of the cleanest $\tau$ lepton decays modes. We describe the techniques employed to study these rare final states and present the latest results on searches for purely leptonic B decays with the BaBar experiment. Flavour Physics and CP Violation jolsen@princeton.edu
576 BaBar Collaboration Search for B meson decays to a K*0K*0bar final state We present a search for B-meson decays to a K*0K*0bar final state. The data sample analysed corresponds to 384 million BBbar pairs produced in e+e- annihilation at the Y(4S) resonance. Flavour Physics and CP Violation jolsen@princeton.edu
577 A.B.Kaidalov, M.I.Vysotsky To the origin of the difference of FSI phases in $B\to\pi\pi$ and $B\to\rho\rho$ decays The final state interactions (FSI) model in which soft rescattering of low mass intermediate states dominates is suggested. It explains why the strong interaction phases are large in the $B_d\to\pi\pi$ channel and are considerably smaller in the $B_d\to\rho\rho$ one. Direct CP asymmetries of $B_d\to\pi\pi$ decays which are determined by FSI phases are considered as well. Flavour Physics and CP Violation vysotsky@itep.ru
578 A.B.Kaidalov, M.I.Vysotsky To the origin of the difference of FSI phases in $B\to\pi\pi$ and $B\to\rho\rho$ decays The final state interactions (FSI) model in which soft rescattering of low mass intermediate states dominates is suggested. It explains why the strong interaction phases are large in the $B_d\to\pi\pi$ channel and are considerably smaller in the $B_d\to\rho\rho$ one. Direct CP asymmetries of $B_d\to\pi\pi$ decays which are determined by FSI phases are considered as well. Flavour Physics and CP Violation vysotsky@itep.ru
579 ATLAS Collaboration Sensitivity of the ATLAS Experiment to Extra Dimensions In the late nineties several authors suggested that the extra dimensions predicted by string theory might lead to observable effects at high energy colliders. The ATLAS experiment which will start taking data at the LHC in 2007 will be an excellent place to search for such effects. A large set of models within the ADD or the Randall Sundrum geometries has been studied in ATLAS. These models predict a variety of signatures: jets and missing energy from direct graviton production, high mass tails in dilepton and diphoton production due to virtual graviton exchange, production of Kaluza-Klein excitations of standard model particles, etc. The sensitivity of ATLAS to these signatures will be presented. Physics Beyond the Standard Model Contact person: Gustaaf Brooijmans [gusbroo@nevis.columbia.edu] gusbroo@nevis.columbia.edu
580 ATLAS Collaboration Discovery Potential of ATLAS for Extended Gauge Symmetries Many models of physics beyond the standard model are based on extended gauge symmetries and predict the existence of new heavy particles, often at the TeV scale. Such particles include heavy W and Z bosons, doubly charged higgses, heavy majorana neutrinos, leptoquarks and heavy fermions. The discovery potential of the ATLAS experiment, which will start taking data at the LHC in 2007, will be presented. Physics Beyond the Standard Model Contact person: Gustaaf Brooijmans [gusbroo@nevis.columbia.edu] gusbroo@nevis.columbia.edu
581 ATLAS Collaboration Electroweak Symmetry Breaking without Higgs Bosons at ATLAS While the Brout-Englert-Higgs model of electroweak symmetry breaking is the best studied scenario, a number of alternative models exist, predicting new signatures. The ATLAS experiment will start data taking at the LHC in 2007 and will search for evidence for such models. This includes studies of vector boson scattering and searches for the production of particles predicted in technicolor models. Studies of the sensitivity of the experiment to such models will be presented. Physics Beyond the Standard Model Contact person: Gustaaf Brooijmans [gusbroo@nevis.columbia.edu] gusbroo@nevis.columbia.edu
582 ATLAS Collaboration Searching for Compositeness with ATLAS An intriguing possibility is that leptons and quarks might be composites made from more fundamental particles. The ATLAS detector will be exploring a completely new energy regime at the LHC starting in 2007 and will be in a position to search for evidence of compositeness or excited quarks or leptons. The discovery potential of ATLAS to such possibilities will be described. Physics Beyond the Standard Model Contact person: Gustaaf Brooijmans [gusbroo@nevis.columbia.edu] gusbroo@nevis.columbia.edu
583 ATLAS B-physics group ATLAS preparations for B-decays measurements sensitive to BSM phenomena. The LHC experiments will perform sensitive tests of physics phenomena beyond the Standard Model (BSM). Investigation of decays of beauty hadrons represents an alternative approach in addition to direct BSM searches. The ATLAS efforts concentrate on those B decays that can be selected already at the first and second trigger levels. The most favorable trigger signature will be for B hadrons decaying to J/psi ->mumu Using this trigger ATLAS will be able to accommodate unprecedently high statistics in so called Golden LHC channel: Bs->Jpsiphiallowing a measurement of the CP violation effect, where BSM models predicted values are significantly higher than SM. In the rare decays sector, these are purely di-muon decays, and families of semi-muonic exclusive channels. Already with 1 fb-1 the ATLAS sensitivity in the di-muon channels will be comparable to today worlds statistics. The strategy is to carry on the di-muon channel programme up to nominal LHC luminosity. In particular the Bs→mumusignal with 4.3 sigma significance can be measured combining low luminosity samples with those of one year of LHC operation at a luminosity of 10*34cm-2 s-1. This precision allows excluding or confirming the SM unambiguously. Flavour Physics and CP Violation maria.smizanska@cern.ch
584 HEP2007 organisers test - please ignore test - please ignore History of Particle Physics Joleen.Pater@manchester.ac.uk
585 Uwe Oberlack on behalf of the XENON Collaboration New Limits on SUSY WIMP Dark Matter from the XENON10 Experiment Some 25% of the matter and energy content of the universe consists of non-baryonic cold Dark Matter (DM), the nature of which is unknown. Theories based on supersymmetry (SUSY) predict neutralinos as a natural DM candidate. These hypothetical particles would act as Weakly Interacting Massive Particles (WIMPs), with very small interaction cross-sections with matter and masses in the range of about 10^{1-3} GeV. Direct search for these particles aims at measuring the recoil energy from elastic WIMP-nucleus scattering in a sensitive detector with very low background and/or background discrimination. XENON10 is a dual phase liquid/gas xenon TPC for the direct search of WIMPs, and is located in the Gran Sasso National Laboratory in Italy. It distinguishes electronic interactions (gamma, beta) from nuclear recoils with a discrimination power of ~99.5% at a nuclear recoil acceptance of 50%. Background is further reduced using mm-scale position resolution in all dimensions, which enables the selection of a well-defined fiducial volume of low background. XENON10 was extensively calibrated with gamma- and neutron sources. A blind search, with data cuts fixed a priori based on calibration data and 16 days of unblinded background data, had an exposure of 136 kg days. We report our first upper limit on WIMP DM interactions with this detector, which is up to a factor of 6 below the best limit established so far by the CDMS-II experiment. Astroparticle Physics, Gravitational Waves and Cosmology oberlack@rice.edu
586 BaBar Collaboration Study of Exclusive Cabibbo favored Semileptonic B decays A complete understanding of semileptonic $B$-decays allows to study the dynamic of the $B$ decays and it is crucial to reduce the uncertainties on the extraction of the fundamental parameters $V_{ub}$ and $|V_{cb}|$. Although the $B\to X_c \ell \nu$ branching ratio is relatively high, the composition of the exclusive $B\to D,D^*,D^{**} \ell \nu$ decays still suffers of large errors. We present preliminary results from analyses of semileptonic $B$ decays into charmed mesons based on large samples of data collected with the BaBar detector at the PEP-II storage ring at SLAC. Flavour Physics and CP Violation jolsen@princeton.edu
587 M. Jarvinen Single Spin Asymmetry at Large x_F and k_T The large single spin asymmetries observed at high momentum fractions x_F and transverse momenta k_T in p^\uparrow p -> \pi(x_F,k_T)+X as well as in pp -> \Lambda^\uparrow(x_F,k_T)+X suggest that soft helicity flip processes are coherent with hard scattering. Such coherence can be maintained if x_F -> 1 as k_T -> \infty, while k_T^2(1-x_F) \sim \Lambda_QCD^2 stays fixed. The entire hadron wave function, rather than a single quark, then contributes to the scattering process. Analogous coherence effects have been seen experimentally in the Drell-Yan process at high x_F. We find that the p^\uparrow p -> \pi(x_F,k_T)+X production amplitudes have large dynamic phases and that helicity flip contributions are unsuppressed in this limit, giving rise to potentially large single spin asymmetries. Strong Interactions arXiv: hep-ph/0611293 Journal reference: JHEP 0702 (2007) 039 matti.o.jarvinen@helsinki.fi
588 ATLAS Collaboration Prospects for single top cross-section measurements in ATLAS Evidence of a single-top production has been searched for since the discovery of the top quark at the TeVatron. Only recently the D0 collaboration claimed a 3 sigma evidence via the measurement of a combined s- and t- channel single-top cross-section. Future measurements will benefit from higher statistics and should result in a clear separation of the two individual contributions. However, with more than two millions single top events produced every year during a low luminosity run, only the LHC will allow to perform a precise determination of all contributions to the total single-top cross-section, including the associate production of a W boson and a top that escapes the TeVatron reach. These measurements will constitute in turn the first direct determination of V_tb at the few percent level of precision. They will also constitute a powerful probe for new physics, via the search for evidence of anomalous couplings to the top quark or the measurements of additional bosonic contributions to the single top production. This presentation establishes the LHC potential for the cross-section measurements of all three single-top contributions, emphasizing the estimate of systematic uncertainties that will constitute the main limitations of the measurements. A special emphasis is put on the strategies for an early evidence of single top production, including triggers and backgrounds estimate strategies. Interpretations in terms of V_tb and top width are then provided, and the sensitivity to polarization measurements is shown. Finally, the sensitivity to new charged Higgs bosons is also reported. High-Energy Electroweak Physics Contact person: Arnaud Lucotte lucotte@lpsc.in2p3.fr lucotte@lpsc.in2p3.fr
589 ATLAS Collaboration Light Higgs boson discovery potential with ATLAS A light (mass between 114 and ~200 GeV) Standard Model Higgs boson is favored by precise measurements of electroweak radiative corrections. This talk reviews the ATLAS discovery potential of a light Higgs boson, with emphasis on the vector boson fusion production modes, which allows a better background rejection, and on the Higgs to gamma gamma decay channel, where the impact on NLO computations is discussed. High-Energy Electroweak Physics Contact person: Louis Fayard [lfayard@in2p3.fr] lfayard@in2p3.fr
590 ATLAS Collaboration Investigation of the Discovery Potential for Higgs Bosons beyond the SM in ATLAS The discovery potential for Higgs bosons in extension of the Standard model e.g. the Minimal Supersymmetric Extension of the Standard Model (MSSM) with the ATLAS detector at the LHC is discussed. For the MSSM different CP conserving and violating benchmmark scenarios are considered. The discovery potential is evaluated and the possibilty of distinguishing between SM and MSSM via coupling determinations is discussed. Invisible Higgs boson decays appear in several extensions of the SM. The possibilty of its observation comparing different production modes is discussed. Physics Beyond the Standard Model Contact person: Markus Schumacher [markus.schumacher@hep.physik.uni-siegen.de] markus.schumacher@hep.physik.uni-siegen.de
591 ATLAS Collaboration Measurement of Higgs Boson Properties Assuming that Standard Model or Supersymmetric Higgs bosons will have been discovered at the LHC, one important goal will be a precise measurement of their parameters. Such measurements should give further insigths into the electroweak symmetry breaking mechanism and into the way the Higgs boson(s) couples to fermions and bosons. In this talk the precision which can be achieved at the LHC in the determination of important Higgs boson parameters is presented. The measurements discussed are the mass, the width, the spin, the CP quantum numbers and the couplings to bosons and fermions. The later measurements use all the possible channels in which the Higgs boson can be observed, including the production via the vector boson fusion process. High-Energy Electroweak Physics Contact person: Markus Schumacher [markus.schumacher@hep.physik.uni-siegen.de] markus.schumacher@hep.physik.uni-siegen.de
592 P.Kooijman, for the ANTARES collaboration Results from the ANTARES neutrino telescope The ANTARES detector has been operational with one detector string for more than one year and has had several months of running with five of the ultimately twelve detector strings. Results will be presented on the data collected in these periods. Calibration and track reconstruction techniques will be presented. Reconstructed atmospheric muon spectra and the first candidate neutrino induced events will be shown. Astroparticle Physics, Gravitational Waves and Cosmology this could also be in neutrino physics. However I think the suggested session is more appropriate. h84@nikhef.nl
593 ATLAS Collaboration SUSY searches at ATLAS: strategy for understanding of the detector and the background with early data We review the strategy for searching for R-parity conserving SUSY particles with the ATLAS detector at LHC. Results are focussed on the early stage of collision. The techniques for understanding detector performance (missing ET and jet calibration) and estimating Standard Model backgrounds using early data will be summarized in this talk. Finally we present the expected discovery potential of SUSY particles showing that the ATLAS detector has good potential to discover SUSY particles already in the early stage of collision. Physics Beyond the Standard Model Contact person: Shoji ASAI [Shoji.Asai@cern.ch] Shoji.Asai@cern.ch
594 ATLAS Collaboration R-hadron and Long-lived Particle Searches at ATLAS We summarize the strategy for searching for heavy charged SUSY particles and the R-hadron with the ATLAS detector at LHC. The event topologies are different from the classical SUSY searches based on missing ET. We also discuss how to trigger on these particles and how to reconstruct them. We show that the ATLAS detector has good potential for the discovery of R-hadrons/Heavy charged particles. Physics Beyond the Standard Model Contact person: Shoji ASAI [Shoji.Asai@cern.ch] Shoji.Asai@cern.ch
595 Ricardo Goncalo on behalf of the ATLAS Trigger-DAQ collaboration The ATLAS trigger and its operation during early data taking The ATLAS experiment is one of the two general-purpose experiments due to start operation soon at the Large Hadron Collider (LHC). The LHC will collide protons at a centre of mass energy of 14 TeV, with a bunch-crossing rate of 40 MHz. The ATLAS three-level trigger will reduce this input rate to match the foreseen offline storage capability of 100-200 Hz, while retaining the most interesting physics. The first trigger level is implemented in hardware, and produces an output rate of less than 100 kHz with a fixed latency of 2 microseconds. Events accepted by this trigger level are further analysed by the High-Level Trigger (HLT). The HLT is implemented in software running in commercially available computer farms and consists of Level 2 and Event Filter. To reduce the network data traffic and the processing time to manageable levels, the HLT uses seeded, step-wise reconstruction, aiming at the earliest possible rejection. Data produced during LHC commissioning will be vital for calibrating and aligning sub-detectors, as well as for testing the ATLAS trigger and setting up the online event election (or trigger menu). This will be done initially using zero-bias and minimum-bias collisions for system calibration and checks. As the LHC luminosity increases, the trigger menu will need to adapt so that the available output storage rate is used optimally to maximize the ATLAS physics potential. In preparation for LHC collision data, sections of the ATLAS muon spectrometer were used in cosmic-ray commissioning runs. These included a complete trigger and data-acquisition chain up to Level 2. Additionally, the data-acquisition system and the HLT software are periodically tested using part of the readout chain to supply simulated events in raw-data format to a subset of the HLT farm. We give an overview of the ATLAS trigger focusing on the system design and its innovative features. We then present the ATLAS trigger strategy for the initial phase of LHC exploitation, up to a luminosity of 10^31 s^-1cm^-2. Emphasis will be given to the full trigger menus, including physics, calibration, and monitoring triggers. Finally, we report on the valuable experience acquired through in-situ commissioning of the system using cosmic-ray muons and play-back of simulated events in raw-data format. Detectors and Data Handling r.goncalo@rhul.ac.uk
596 ATLAS Collaboration Cross-section measurement (pp ->Z/gamma*->MuMu) with the first 50pb-1 The study of the Z Boson at the ATLAS experiment provides several interesting aspects already in the starting phase of the LHC. The measurements of cross section and transverse momentum spectrum (ptZ) of the Z boson at ATLAS provide additional tests of the standard model and may be sensitive to exotic physics processes. Z boson production is also a common background process for many other physics analyses and must be understood very well. The achievable precision of the overall cross section (pp ->Z/gamma->Mu+Mu-)measurement with first collisions of LHC recorded by ATLAS detector is discussed. The differential cross-section measurement dsigma/dptZ and its constraints on the PDFs of the proton at high energies has been studied. Special emphasis is placed on methods for calibration and determination of resolutions and efficiencies of the ATLAS detector based on the decay of Z-Bosons into two muons. Finally the possibility for an online luminosity measurement cross-check, based on a rough cross-section measurement within the muon-calibration data stream, is discussed. The so-called muon-calibration data stream is designed for the calibration and the alignment of the ATLAS Muon Spectrometer and is evaluated at three computing centers based in Munich, Michigan and Rome. Strong Interactions Contact person: Matthias.Schott [Matthias.Schott@physik.uni-muenchen.de] Matthias.Schott@physik.uni-muenchen.de
597 OPAL Collaboration Inclusive Jet Production in Photon-Photon Collisions at ee centre-of-mass energies from 189 to 209 GeV Inclusive jet production e+e- -> e+e- + jet + X is studied in collisions of quasi-real photons radiated by the LEP beams at e+e- centre-of-mass energies from 189 to 209 GeV. Jets are reconstructed using the kt jet algorithm. The inclusive differential cross-section is measured as a function of the jet transverse momentum, pt_jet, in the range 5 < pt_jet < 40 GeV for pseudo-rapidities, eta_jet, in the range -1.5 < eta_jet < 1.5. The results are compared to predictions of perturbative QCD in next-to-leading order in the strong coupling constant. Strong Interactions opal-physics-coordinators@cern.ch
598 OPAL Collaboration Inclusive Production of Charged Hadrons in Photon-Photon Collisions The inclusive production of charged hadrons in the collisions of quasi-real photons e+e- -> e+e- + X has been measured using the OPAL detector at LEP. The data were taken at e+e- centre-of-mass energies from 183 to 209 GeV. The differential cross-sections as a function of the transverse momentum and the pseudorapidity of the hadrons are compared to theoretical calculations of up to next-to-leading order (NLO) in the strong coupling constant alpha_s. The data are also compared to a measurement by the L3 Collaboration, in which a large deviation from the NLO predictions is observed. Strong Interactions opal-physics-coordinators@cern.ch
599 OPAL Collaboration Search for invisibly decaying Higgs bosons with large decay width using the OPAL detector at LEP This paper describes a topological search for an invisibly decaying Higgs boson, H, produced via the Bjorken process e+e- --> HZ. The analysis is based on data recorded using the OPAL detector at LEP at centre-of-mass energies from 183 to 209GeV corresponding to a total integrated luminosity of 629pb-1. In the analysis only hadronic decays of the Z boson are considered. A scan over Higgs boson masses from 1 to 120GeV and decay widths from 1 to 3000GeV revealed no indication for a signal in the data. From a likelihood ratio of expected signal and SM background we determine upper limits on cross-section times branching ratio to an invisible final state. For moderate Higgs boson decay widths, these range from about 0.07pb (Mh = 60GeV) to 0.57pb (Mh = 114GeV). For decay widths above 200GeV the upper limits are of the order of 0.15pb. The results can be interpreted in general scenarios predicting a large invisible decay width of the Higgs boson. As an example we interpret the results in the so-called stealthy Higgs scenario. The limits from this analysis exclude a large part of the parameter range of this scenario experimentally accessible at LEP2. Physics Beyond the Standard Model opal-physics-coordinators@cern.ch
600 OPAL Collaboration Measurement of alpha_s using the Four-Jet Rate with the OPAL Experiment Data from e+e- annihilation into hadrons at centre-of-mass energies between 91 GeV and 209 GeV collected with the OPAL detector at LEP, are used to study the four-jet rate as a function of the Durham algorithm resolution parameter ycut. The four-jet rate is compared to next-to-leading order calculations that include the resummation of large logarithms. The strong coupling measured from the four-jet rate is alpha_s(M_Z) = 0.1182 +- 0.0003 (stat.) +- 0.0015 (exp.) +- 0.0011 (had.) +- 0.0012 (scale) +- 0.0013 (mass) in agreement with the world average. Next-to-leading order fits to the D-parameter and thrust minor event-shape observables are also performed for the first time. We find consistent results, but with significantly larger theoretical uncertainties. Strong Interactions opal-physics-coordinators@cern.ch
601 OPAL Collaboration QCD coherence studies using correlations of particles with restricted momenta QCD coherence effects are studied based on measurements of correlations of particles with either restricted transverse momenta, pT < pTcut, where pT is defined with respect to the thrust axis, or restricted absolute momenta, p = |p| < pcut, using about four million hadronic Z0 decays recorded at LEP with the OPAL detector. The correlations are analyzed in terms of normalized factorial and cumulant moments. The analysis is inspired by analytical QCD calculations which, in conjunction with Local Parton-Hadron Duality (LPHD), predict that, due to colour coherence, the multiplicity distribution of particles with restricted transverse momenta should become Poissonian as pTcut decreases. The expected correlation pattern is indeed observed down to pTcut ~ 1 GeV but not at lower transverse momenta. Furthermore, for pcut -> 0 GeV a strong rise is observed in the data, in disagreement with theoretical expectation. The Monte Carlo models reproduce well the measurements at large pTcut and pcut but underestimate their magnitudes at the lowest momenta. The e+e- data are also compared to the measurements in deep-inelastic e+p collisions at HERA. It is shown that for soft particles, the often assumed equivalence of a single hemisphere in e+e- annihilation with the current region in the Breit frame of a deep-inelastic collision may be misleading. Our study indicates difficulties with the LPHD hypothesis when applied to many-particle inclusive observables of soft hadrons. Strong Interactions opal-physics-coordinators@cern.ch
602 Marcos Fernandez Garcia The CMS drift tubes and the alignment system during the Magnet Test In the second half of 2006, a test of the CMS magnet allowed to have a minimum set of all CMS subdetectors working at the same time for the first time. Synchronization studies in the muon system allowed to take data with the 3 different cosmic subsystems. Specific studies were accomplished, like the study of the effect of the magnetic field on the drift velocity. Opening/closing of the whole detector was monitored with the CMS alignment system. Track alignment of the detectors with the hardware alignment system were compared. Detectors and Data Handling Marcos.Fernandez@cern.ch
603 N.K.Watson, S.Molloy et al.(UK LC-ABD/EUROTeV/SLAC) Collimator Design for the ILC Spoiler design for the ILC presents two distinct challenges: geometry and material choice to reduce short range transverse wakefields to an acceptable level, and choice of materials and construction that will survive a direct beam impact from a single errant bunch at the highest energy. Beam tests to address these critical questions and to allow an improvement in modelling capability have recently taken place at SLAC End Station A (T480 - for wakefields), and are in preparation for the study of beam damage. We describe the status of these tests and their results. Accelerator RD and Technology Apologies for very late submission. Nigel.Watson@rl.ac.uk
604 Shih-Chieh Hsu, Elliot Lipeles, Mark Neubauer, Matthew Norman, Rami Vanguri, Frank Wurthwein Heavy Diboson Physics at CDF There has been much recent progress in diboson physics at the highest available energies afforded by $p\bar{p}$ collisions at $\sqrt(s)=1.96$~TeV at the Fermilab Tevatron. In this talk, we present the latest results from CDF involving heavy diboson final states ($WW$, $WZ$, $ZZ$) using up to 2 fb-1 of integrated luminosity. These include the first $WZ$ observation, a search for $ZZ$ production in $ZZ\rightarrow\ell\ell\ell\ell$ and $ZZ\rightarrow\ell\ell\nu\nu$, a search for anomalous triple gauge couplings (TGCs) in $WZ\rightarrow\ell\ell\ell\nu$, and a search for neutral TGCs in $ZZ\rightarrow\ell\ell jj$. High-Energy Electroweak Physics msn@fnal.gov
605 Aldo Morselli, on behalf of the GLAST Collaboration GLAST and the future of High Energy Gamma-ray astrophysics The Gamma-ray Large Area Space Telescope (GLAST) is a mission that is being built by an international collaboration with contributions from space agencies, high-energy particle physics institutes, and universities in France, Italy, Japan, Sweden and the United States to measure the cosmic gamma-ray flux in the energy range 20 MeV to >300 GeV, with supporting measurements for gamma-ray bursts from 10 keV to 25 MeV. With its launch in early 2008, GLAST will open a new and important window on a wide variety of high energy phenomena, including black holes and active galactic nuclei; gamma-ray bursts; the origin of cosmic rays and supernova remnants; and searches for hypothetical new phenomena such as supersymmetric dark matter annihilations, Lorentz invariance violation, and exotic relics from the Big Bang. Astroparticle Physics, Gravitational Waves and Cosmology aldo.morselli@roma2.infn.it
606 W. Trischuk for the ATLAS-BCM collaboration The ATLAS Beam Conditions Monitor Beam conditions and the potential detector damage resulting from their anomalies have pushed the LHC experiments to plan their own monitoring devices. The ATLAS Beam Conditions Monitor (BCM) solution consists of two rings (forward and backward) of detectors each with four modules. These are required to be radiation hard (50 Mrad). Each module includes two diamond pad sensors read out in parallel. The rings are located symmetrically around the interaction point at z=±184 cm and r=55 mm (a pseudo-rapidity of about 4.2). Equipped with fast electronics (2 ns rise times) these stations measure time-of-flight and pulse height to distinguish events resulting from beam anomalies from those normally occurring in proton-proton interactions. The BCM also provides a coarse measurement of bunch-by-bunch luminosities in ATLAS by counting in-time and out-of-time collisions. Eleven detector modules have been fully tested and assembled. Tests performed range from full characterisation of diamond sensors to full module tests with electron sources and proton testbeams. Testbeam results in the CERN PS show a module signal to noise of 14±2 for minimum ionising particles. The best eight modules have now been installed on the ATLAS pixel support frame that will be installed in ATLAS during the summer of 2007. The final BCM system will be described together with simulation studies upon which the logic implemented in the back-end FPGA coincidence hardware was based. Detectors and Data Handling Or could be Accelerator R&D/technology too... william@physics.utoronto.ca
607 ATLAS Collaboration Presision measurement of W mass at LHC With the precise measurement of the top mass at Tevatron, the uncertainty in the W mass has become the limiting factor for sensitivity to the Standard Model (SM) Higgs mass and what may lie beyond. A W mass precision measurement is feasible at the LHC due to large number of events, not only for W decays, but also corresponding Z decays, which will be the key ingredients for precision calibration and understanding of systematic errors. Using statistics corresponding to 10 fb-1 of data at the LHC, we have investigated strategies for improving the uncertainty on the mass measurement beyond 15 MeV, including both theoretical and experimental effects. Central issues such as momentum scale and linearity, trigger and reconstruction efficiency, W width and PDF uncertainty, recoil model, missing Et calibration, final state radiation, and backgrounds along with their impact on the W mass measurement have been investigated, and the conclusion is that no single source of uncertainty necessarily contribute more than 5 MeV to the overall uncertainty. Furthermore, no limiting factor has been found, suggesting that with more data and combined channels and experiments one can reach down to 5 MeV in precision. If the top mass measurement continues to improve, then the precision measurement of the W mass described above will not only allow for a good indirect SM Higgs mass measurement, but also for precise cross checks of the SM itself. High-Energy Electroweak Physics I send this on behalf of the ATLAS speakers committee, in the temporary absence of the official contact Martine Bosman. Thank you for your understanding. maarten.boonekamp@cern.ch;martine.bosman@cern.ch
608 ATLAS Collaboration Presision measurement of W mass at LHC With the precise measurement of the top mass at Tevatron, the uncertainty in the W mass has become the limiting factor for sensitivity to the Standard Model (SM) Higgs mass and what may lie beyond. A W mass precision measurement is feasible at the LHC due to large number of events, not only for W decays, but also corresponding Z decays, which will be the key ingredients for precision calibration and understanding of systematic errors. Using statistics corresponding to 10 fb-1 of data at the LHC, we have investigated strategies for improving the uncertainty on the mass measurement beyond 15 MeV, including both theoretical and experimental effects. Central issues such as momentum scale and linearity, trigger and reconstruction efficiency, W width and PDF uncertainty, recoil model, missing Et calibration, final state radiation, and backgrounds along with their impact on the W mass measurement have been investigated, and the conclusion is that no single source of uncertainty necessarily contribute more than 5 MeV to the overall uncertainty. Furthermore, no limiting factor has been found, suggesting that with more data and combined channels and experiments one can reach down to 5 MeV in precision. If the top mass measurement continues to improve, then the precision measurement of the W mass described above will not only allow for a good indirect SM Higgs mass measurement, but also for precise cross checks of the SM itself. High-Energy Electroweak Physics I send this on behalf of the ATLAS speakers committee, in the temporary absence of the official contact Martine Bosman. Thank you for your understanding. maarten.boonekamp@cern.ch
609 ATLAS Collaboration The Heavy-Ion Physics Programme with the ATLAS Detector The CERN LHC will collide lead ions at sqrt(s)=5.5 TeV per nucleon pair and will provide crucial information about the formation of a quark gluon plasma at the highest temperatures and densities ever created in the laboratory. We report on an updated evaluation of the ATLAS potential to study heavy-ion physics. The ATLAS detector will perform especially well for high pT phenomena even in the presence of the high-multiplicity soft background expected from lead-lead collisions, and most of the detector subsystems retain their nearly full capability. ATLAS will study a full range of observables which characterize the hot and dense medium formed in heavy-ion collisions. In addition to global measurements such as particle multiplicities and collective flow, heavy-quarkonia suppression, jet quenching and the modification of jets passing in the dense medium will be accessible to ATLAS. ATLAS will also study forward physics and ultraperipheral collisions using Zero Degree Calorimeters. High-Energy Nuclear Physics The speaker is not specified yet. Laurent.Rosselet@cern.ch
610 Mirko Boezio on behalf of the Pamela Collaboration The PAMELA Space Experiment First Year of Operation On the 15th of June, the PAMELA experiment mounted on the Resurs DK1 satellite, was launched from the Baikonur cosmodrome and it is collecting data since July 2006. PAMELA is a satellite-borne apparatus designed to study charged particles in the cosmic radiation, to investigate the nature of dark matter, measuring the cosmic-ray antiproton and positron spectra over the largest energy range ever achieved, and to search for antinuclei with unprecedented sensitivity. The apparatus comprises a time-of-flight system, a silicon-microstrip magnetic spectrometer, a silicon-tungsten electromagnetic calorimeter, an anticoincidence system, a shower tail catcher scintillator and a neutron detector. The combination of these devices allows charged particle identification over a wide energy range. We will discuss PAMELA science and present the status of the apparatus after one year in orbit. Astroparticle Physics, Gravitational Waves and Cosmology mirko.boezio@ts.infn.it
611 ATLAS Pixel Collaboration Overview and Status of ATLAS Pixel Detector The ATLAS silicon pixel detector is nearing completion for operation at the Large Hadron Collider at CERN. The ATLAS pixel detector contains approximately 80 million channels and 1744 detector modules. Electronics and module fabrication and testing is complete, as well as system integration of major elements of the pixel detector. The overall status of the ATLAS pixel detector will be presented, emphasizing systems issues and lessons learned in fabricating this new type of detector for hadron collider experiments. Detectors and Data Handling Abstract submitted on behalf of ATLAS Pixel Collaboration. Speaker will be nominated later. Clara Troncon - for Speakers Committee of ATLAS Pixel Detector clara.troncon@mi.infn.it
612 ATLAS Pixel Collaboration System test for the ATLAS Pixel Detector data acquisition The ATLAS Pixel Detector is an 80 M channels silicon tracking system designed to detect charged tracks and secondary vertices with very high precision. To verify that the integrated assembly will perform as expected subsequent to installation into the experimental area, a fraction (10%) of the detector and the requisite ancillary services has been assembled and operated in a laboratory setting. We refer to this as system testing, and results from these tests will be presented. The talk will illustrate all the aspects of the system test, including the detector control and safety system, the monitoring system and the DAQ system, the data base technologies used to store the configuration and condition data, the techniques for calibrating the detector and the analysis of noise tests and cosmic data. Strong Interactions Abstract submitted on behalf of ATLAS Pixel Detector Collaboration. The speaker will be nominated later. Clara Troncon for the Speakers Committe of ATLAS Pixel Detector clara.troncon@mi.infn.it
613 A. N. khorramian and S. Atashbar Tehrani Nonsinglet QCD analysis in the NNLO approximation A non-singlet QCD analysis of the structure function up to NNLO is performed based on the ortogonal polynomials approach. We use recently calculated NNLO anomalous dimension coefficients for the moments of the non singlet structure function. The results of valence quark distributions up to NNLO are in good agreement with the available theoretical models. In the analysis we determined the QCD-scale $\Lambda^ {\overline{MS}} _{QCD, N_{f}=4} up to NNLO. We compare our results for the QCD scale and the $\alpha_s(M_Z^2)$ with those obtained from deep inelastic scattering processes. Strong Interactions khorramiana@theory.ipm.ac.ir
614 Alfons Weber for the MINOS Collaboration New Results from the MINOS Experiment MINOS is a long baseline neutrino oscillation experiment, which measures neutrino oscillation parameters using the NuMI beam generated at Fermilab. The beam mainly consists of muon neutrinos and is measured by two functionally identical detectors. The near detector is located on the Fermilab site around 1km away from the neutrino production target, while the far detector is 734 km further in the Soudan Underground Laboratory. MINOS has started to take accelerator neutrino data in 2005 and has now collected neutrino interactions from more than 3E20 protons on target. The new results from the experiment will be presented. Neutrino Physics I have been selected by the MINOS speakers committee to represent the MINOS collaboration at this conference. A.Weber@rl.ac.uk
615 CDF Collaboration Search for charged massive stable particles We perform a model-independent search for massive long-lived charged particles using 1.03 ~$\rm{fb}^{-1}$ of Run 2 data collected with the high-$\pt$ CMUP trigger. The search uses the Time-of-Flight and COT detectors to isolate slowly moving, high-\Pt\ particles. We observe candidate one event with a reconstructed mass above 100 GeV/c2 with an expected background of about 1.5 events. Interpreting this result within the context of a reference model with a stable scalar stop squark, we set an upper bound on the production cross section that translates to a lower limit on the mass of a stable stop squark. Within the context of a general model of stable stop pair production, we set a lower stop mass limit of of 250 GeV/c2 at 95% C.L. Physics Beyond the Standard Model Abstract submitted by Vyacheslav Krutelyov (UCSB). The public web-page for the result is at http://dukpc23.fnal.gov/~phillips/CHAMPwebPage/public/ Please consider this and the accompanying abstract "Search for Heavy, Long-Lived Particles that Decay to Photons at CDF" as a base for a single talk on "Searches for Long-Lived Particles at CDF". slava77@fnal.gov
616 CDF Collaboration Search for Heavy, Long-Lived Particles that Decay to Photons at CDF We present the first search for heavy, long-lived particles that decay to photons at a hadron collider. We use a sample of $\gamma$+jet+missing transverse energy events in $p{\bar p}$ collisions at $\sqrt{s}=1.96$~TeV taken with the CDF II detector. Candidate events are selected based on the arrival time of the photon at the detector. Using an integrated luminosity of 570~\invpb\ of collision data, we observe 2 events, consistent with the background estimate of 1.3$\pm$0.7 events. While our search strategy does not rely on model-specific dynamics, we set cross section limits in a supersymmetric model with $\tilde\chi0_1\to\gamma$G and place the world-best 95\% C.L. lower limit on the \none\ mass of 101~\gevc\ at $\tau_{\tilde{\chi}_10}$~=~5~ns. Physics Beyond the Standard Model Abstract submitted by Vyacheslav Krutelyov (UCSB). The result is documented in http://xxx.lanl.gov/abs/0704.0760 [Submitted to PRL]. Please consider this and the accompanying abstract "Search for charged massive stable particles" as a base for a single talk on "Searches for Long-Lived Particles at CDF". slava77@fnal.gov
617 Jiyeon Han, Arie Bodek, Willis Sakumoto, Y.S.Chung for the CDF Collaboration $d\sigma/dy$ distribution of Drell-Yan dielectron pairs We report on the measurement of the rapidity distribution, $d\sigma/dy$, over the full kinematic range for $e^+e^-$ pairs in the $Z$ boson region of $66 High-Energy Electroweak Physics jyhan@fnal.gov
618 Antonio Pineda Renormalization group improved sum rule analysis for the bottom quark mass We study the effect of resumming large logarithms in the determination of the bottom quark mass through a non-relativistic sum rule analysis. Our result is complete at next-to-leading-logarithmic accuracy and includes some known contributions at next-to-next-to-leading logarithmic accuracy. Compared to finite order computations, the reliability of the theoretical evaluation is greatly improved, resulting in a substantially reduced scale dependence and a faster convergent perturbative series. This allows us to significantly improve over previous determinations of the $\MS$ bottom quark mass, $\bar{m}_b$, from non-relativistic sum rules. Our final figure reads $\bar{m}_b(\bar{m}_b)=4.19\pm 0.06$ GeV. Strong Interactions pineda@ifae.es
619 Sherwin Love Vector Dynamics in Locally Invariant Brane World Models The appearance of one or more vector fields is a generic consequence of brane world models in which the broken translation invariances of the extra dimensions are realized nonlinearly. The interaction of these vector fields with the Standard Model are characterized using an effective operator analysis. Constraints on the parameters of these effective operators are scrutinized. Physics Beyond the Standard Model loves@physics.purdue.edu
620 ATLAS Muon Group Commissioning with cosmic rays of the Muon Spectrometer of the ATLAS experiment at the Large Hadron Collider The Muon Spectrometer of the ATLAS experiment is made of a large toroidal magnet, arrays of high-pressure drift tubes for precise tracking and dedicated fast detectors for the first-level trigger. All the detectors in the barrel toroid have been installed and commissioning has started with cosmic rays. These detectors are arranged in three concentric rings and the total area is about 7000 square meters. During the installation and commissioning of the detectors, data are usually taken with the magnet off, but a dedicated run took place with the magnetic field of the barrel toroid turned on. We present the procedure to control the response of the single detectors installed in the barrel toroid, Monitored Drift Tubes and Resistive Plate Chambers, and results of the first tests done with cosmic rays triggered by the first-level processor and read-out trough the ATLAS data acquisition. A comparison of the detector performance in magnetic field on and off will be presented together with a measurement of the cosmic ray flux in the underground experimental area. Details on the installation and commissioning schedule will be given in view of the completion of the instrumentation of the muon spectrometer for the first period of data taking with proton-proton collisions. Detectors and Data Handling This is submitted on behalf of the group.The speaker will be assigned shortly. Christine.Kourkoumelis@cern.ch
621 Cecilia Tarantino Flavour Phyiscs in the Littlest Higgs Model with T-Parity The Littlest Higgs model with T-parity (LHT) contains new sources of flavour and CP violation both in the quark and the lepton sector. They originate from the interactions of ordinary fermions with mirror fermions mediated by new gauge bosons: W_H, Z_H and A_H. The most spectacular departures from the Standard Model are found in K_L -> pi^0 nu {bar nu}, K^+ -> pi^+ nu {bar nu}, in the CP-asymmetry S_{psi phi} and in lepton flavour violating decays. In particular, the latter decays offer a clear distinction between the LHT model and the MSSM. The most interesting results of recent extensive analyses of flavour physics in the LHT model are suumerized. Physics Beyond the Standard Model tarantino@fis.uniroma3.it
622 Cecilia Tarantino Flavour Phyiscs in the Littlest Higgs Model with T-Parity The Littlest Higgs model with T-parity (LHT) contains new sources of flavour and CP violation both in the quark and the lepton sector. They originate from the interactions of ordinary fermions with mirror fermions mediated by new gauge bosons: W_H, Z_H and A_H. The most spectacular departures from the Standard Model are found in K_L -> pi^0 nu {bar nu}, K^+ -> pi^+ nu {bar nu}, in the CP-asymmetry S_{psi phi} and in lepton flavour violating decays. In particular, the latter decays offer a clear distinction between the LHT model and the MSSM. The most interesting results of recent extensive analyses of flavour physics in the LHT model are suumarized. Physics Beyond the Standard Model tarantino@fis.uniroma3.it
623 OPERA Collaboration First events from the CNGS neutrino beam detected in the OPERA experiment The OPERA neutrino detector at the under ground Gran Sasso Laboratory (LNGS) was designed to perform the first detection of neutrino oscillations in appearance mode, through the study of numu to nutau oscillations. The apparatus consists of a lead/emulsion-film target complemented by electronic detectors. It is placed in the high-energy, long-baseline CERN to LNGS beam (CNGS) 730 km away from the neutrino source. In August2006, a first run with CNGS neutrinos was successfully conducted. A first sample of neutrino events was collected, statistically consistent with the integrated beam intensity. A brief description of the beam and of the various sub-detectors will be presented before reporting on the achievement of this milestone, on the first data and on some analysis results. Future plans will also be presented. Neutrino Physics Contact person: Antonio Ereditato antonio.ereditato@cern.ch
624 tara ohmdeiy atomic energy elements &property NUCLEAR ENERGY(PROPERTY OF ELEMENT,REACTION) History of Particle Physics no tara_ahmadi_smart@yahoo.com
625 ATLAS and CMS Collaboration The sLHC prospects at ATLAS and CMS The LHC will start pp collisions at 14 TeV in 2008. The luminosity will ramp up to the design goal of 10^34 cm-2 s-1 over the next few years. After several years data taking at design luminosity, there will still be many physics questions requiring substantially more statistics. The LHC can be upgraded in several stages to reach a peak luminosity of 10 times the design for the super-LHC project. The ATLAS and CMS detectors must be upgraded to cope with the very high pile-up rates and radiation levels to take advantage of the sLHC. This talk summarises the physics goals, sLHC machine plans, and the needs of ATLAS and CMS to adapt to the unprecedented pile-up and radiation levels. Detectors and Data Handling Contact persons: ATLAS Nigel Hessey [nigel.hessey@cern.ch] ; CMS Jordan Nash [jordan.nash@cern.ch] nigel.hessey@cern.ch
626 Alexander Oh The DAQ and Run Control System of CMS The CMS experiment at the CERN Large Hadron Collider is currently being commissioned. First pp collision data are foreseen for the end of 2008. This paper describes the design, implementation and commissioning of the DAQ and Run Control systems of CMS. The DAQ and Run Control systems are the principal components to collect event data from the detector elements. Starting from a pp collision rate of 40 MHz, the event rate is reduced to approximately 100 kHz by the Level-1 trigger which is based on custom hardware. The event data are read-out at the Level-1 trigger rate leading to a sustained data rate of 100 GB/s. The Event Builder assembles the fragments of about 650 front ends in a two stage event building process into complete events. The events are processed in the High Level Trigger computer farm. About 3000 PC running O(10^4) online processes will be needed to fulfil this task. The managing of configuration and control of the DAQ components is the responsibility of the Run Control system. The DAQ is designed to be partition-able. The concept of "DAQ slices" allows to operate independent DAQ systems concurrently to read-out a sub-set of detector systems of the CMS detector. This property also allows a staged deployment of the DAQ taking full advantage of a broad spending profile whilst full system functionality is provided at every stage. The DAQ online software is based on a common framework (Xdaq) written in C++, and runs on Scientific Linux. A centralised cluster management system ensures a coherent and reproducible installation of the software. The online processes are embedded in the hierarchical control structure of Run Control. The Run Control framework is based on a set of web-applications implemented with Java Servlet technology, AJAX and JSP for user interfaces, and supports MySQL and Oracle as DB back-ends. For the DAQ system, a set of tools has been developed to manage the flexible generation of configurations with the goal to allow fast reconfiguration of the system. Currently, the DAQ and Run Control are in the phase of commissioning with the hardware and the software being installed and tested. The commissioning task of the DAQ and Run Control is twofold: The DAQ and Run Control need to be commissioned as a discrete system. On the other side they are vital for the commissioning of the whole CMS experiment to provide the central services of data read-out and control to the sub-detector systems. Sub-detectors are now being integrated into the central systems and a firm schedule of "global runs" using for the lack of proton beams cosmic muons, ensure a zestful pace towards timely completion of CMS to be ready for the first pp collisions of LHC. Detectors and Data Handling Strong Interactions alexander.oh@cern.ch
627 J. Pater on behalf of the FP420 Collaboration The Alignment system for FP420 FP420 is an R&D project to assess the feasibility of installing proton taggers at 420m downstream of the interaction point, a few millimetres from the beam, at ATLAS and/or CMS. The physics process of interest to FP420 is pp --> p + X + p, where X can be for example a Higgs Boson or other new particle. FP420 must be capable of accurately measuring the mass of X, which will require that the position of the detectors relative to the LHC beam is very precisely known. We hope to achieve this precision alignment using a system based on local Beam Position Monitors and Wire-Positioning Sensors. Plans for this system, and supporting test-stand measurements, will be presented. Detectors and Data Handling Joleen.Pater@manchester.ac.uk
628 M. Bonesini (INFN Milano Bicocca) for the MICE Collaboration The design of the time-of-flight system for MICE The International muon Ionization Cooling experiment (MICE) collaboration will carry out a systematic investigation of the ionization cooling of a muon beam. An ionization cooling channel is required to compress the phase-space volume occupied by the muon beam prior to acceleration in the baseline conceptual designs for both the Neutrino Factory and the Muon Collider. The beam instrumentation in MICE includes a state-of-the-art time-of-flight (TOF) system that must yield a resolution of no more than 70 ps per plane. The TOF system is required to operate in the harsh environment created by the high particle flux and the strong magnetic fields produced by the MICE spectrometer solenoids. The design of the system that meets these requirements will be presented together. The results of laboratory tests and of a test-beam exposure of a full-scale prototype at the Test Beam Facility at the Laboratory Nazionali di Frascati will also be presented. Detectors and Data Handling maurizio.bonesini@mib.infn.it
629 Bruno Serfass for the CDMS experiment Status of the Cryogenic Dark Matter Search experiment: CDMS The Cryogenic Dark Matter Search (CDMS) experiment seeks to directly detect Weakly Interacting Massive Particles (WIMPs) by simultaneously measuring the ionization and phonon energies of the interactions in Ge and Si crystals. With 12 Z-sensitive Ionization-phonon detectors (ZIPs) and a total Ge exposure of 145.7 kg-days, CDMS has already reported an upper limit to WIMP-nucleon interaction of 1.6 x 10^-43 cm^2 at a WIMP mass of 60 GeV/c^2. Since then, CDMS has completed the installation and cooling of 18 additional ZIPs (13 Ge and 5 Si) at its deep site (780 m) in Soudan, Minnesota (USA). We present the status of the experiment after the completion of its first run with 30 ZIPs obtaining a total Ge exposure of 430 kg-days. The experiment will continue to acquire data in the present configuration for at least another year. We will discuss the perspective for the future and, in particular, our efforts to maintain CDMS background-free while increasing our WIMP exposure. Astroparticle Physics, Gravitational Waves and Cosmology serfass@berkeley.edu
630 A. G. Cocco, G. mangano, M. Messina Probing Low Energy Neutrino Backgrounds with Neutrino Capture on Beta Decaying Nuclei In this paper we study the interaction of low energy neutrinos on nuclei that spontaneously undergo beta decay. We show that the product of the cross section times neutrino velocity takes values as high as $10^{-42}$ cm$^2$ $c$ for some specific nuclei that decay via allowed transitions and more interesting is the proof of the fact that the product of the cross section times the neutrino velocity does not vanish if neutrino energy is lowered down up to values of eV. The absence of energy threshold and the value of the cross section single out these processes as a promising though very demanding approach for future experiments aimed at a direct detection of low energy neutrino backgrounds such as the cosmological relic neutrinos. Furthermore in the paper is shown a method to calculate the nuclear amplitude and to get rid of the systematic uncertainties affecting the calculations. A comprehensive list of the neutrino capture cross section calculation is reported for a large number of nuclei that undergo beta decay. Neutrino Physics marcello.messina@cern.ch
631 M. E. Elgohary, M. S. Aljohani, M. Y. Khalil Response matrix of multilayer neutron spectrometer The response of a successive set of rectangular parallel layer of BF3 (96% B-10) and water moderator is investigated. 10-BF3 and 9-H2O layers are configured using MCNP-4C to be simulated and studied. this configuration is studied under two geometrical conditions; the first is of 6x10x30 cc while the second is of 3x5x30 cc. Both of them are studied in case of the presence of surrounding water walls around and the other is in case of being bare slab layers. The overall response matrix is obtained and then two cases are studied in order to validate the results. Cf-252 and Am/Be neutron sources are simulated as volumetric sources in these cases. System efficiency and error propagation will be show inside. Accelerator RD and Technology please notify he receiving of this mail msaljohari@kau.edu.sa, emahmud@hotmail.com
632 M. E. Elgohary, M. S. Aljohani, M. Y. Khalil Response matrix of multilayer neutron spectrometer The response of a successive set of rectangular parallel layer of BF3 (96% B-10) and water moderator is investigated. 10-BF3 and 9-H2O layers are configured using MCNP-4C to be simulated and studied. this configuration is studied under two geometrical conditions; the first is of 6x10x30 cc while the second is of 3x5x30 cc. Both of them are studied in case of the presence of surrounding water walls around and the other is in case of being bare slab layers. The overall response matrix is obtained and then two cases are studied in order to validate the results. Cf-252 and Am/Be neutron sources are simulated as volumetric sources in these cases. System efficiency and error propagation will be show inside. Accelerator RD and Technology please notify he receiving of this mail maljohari@kau.edu.sa, emahmud@hotmail.com
633 Martin Kunz Why detecting the dark matter is important for understanding the dark energy Cosmological measurements can only probe the total energy-momentum tensor. This means that we cannot uniquely separate the effects due to the dark energy from those due to the dark matter, as long as we have no direct (non-gravitational) detection of the dark matter. For this reason, we cannot measure separately the abundance of the dark matter, its couplings to the dark energy and the dark energy properties, without making strong prior assumptions on the nature of the dark energy. Astroparticle Physics, Gravitational Waves and Cosmology based on arXiv:astro-ph/0702615 . I am also a convener of the Astroparticle parallel session. Martin.Kunz@physics.unige.ch
634 Luca Ferretti Non-abelian vortices in N=2 gauge theories BPS non-abelian vortices can be constructed in the Higgs phase of 4d N=2 theories for SU(N) and SO(N) gauge groups. Moduli matrix techniques are employed to study their moduli space. A relation between these vortices and non-abelian monopoles can be established through topological and flux-matching considerations. This relation gives interesting hints on electric-magnetic duality. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry Based on hep-th/0611313 and on a paper by Ferretti,Gudnason,Konishi to appear soon on ArXiv. ferretti@sissa.it
635 Mauro Papinutto Phenomenological applications of non-perturbative heavy quark effective theory We briefly review the strategy to perform non-perturbative heavy quark effective theory computations and we specialize to the case of the b quark mass which has been recently computed including the 1/m term. We consider another phenomenologically relevant quantity where this strategy could be applied, the B_B parameter which is related to the neutral B meson mass difference. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry Preferred date for the talk: 19th or 20th of july. mauro.papinutto@cern.ch
636 Luca Ferretti O'Raifeartaigh models with spontaneous R-symmetry breaking O’Raifeartaigh models with general R-charge assignments can have vacua where both supersymmetry and R-symmetry are spontaneously broken. These vacua are often metastable because the potential has generally a runaway behavior. We discuss the relation between runaway directions and R-symmetry. We also show models with global symmetries that can play the role of hidden metastable SUSY-breaking sector in theories with gauge mediation or direct mediation. Physics Beyond the Standard Model Based on a paper to appear next week on ArXiv. ferretti@sissa.it
637 CDF collaboration Measurements of Top Quark Pair Production at CDF We present several measurements of the top pair production cross-section at CDF in p-pbar collisions at 1.96 TeV using ~1 fb-1 of data. We also compare selected kinematical distributions with the predictions of the Standard Model. In the dilepton mode, we select events with two charged leptons, high missing transverse energy and at least 2 jets. We present two complementary measurements, one requires both leptons to be specifically identified, the other allows a lepton to be identified as a high P$_T$ track. In the lepton+jets mode, we select events with one charged lepton, high missing transverse energy and at least 3 jets. We present several complementary measurements using kinematic discrimination and/or $b$-tagging, via both displaced secondary vertices and semileptonic decay to a muon. In the all-hadronic channel, we select events with at least 6 jets. We present a measurement using an optimized kinematic selection and events with one or more displaced secondary vertices. We also present a measurement on determining the number of top pairs produced by gluon-gluon fusion versus quark-antiquark annihilation. We have two complementary techniques for making this measurement. Strong Interactions tollefson@pa.msu.edu
638 CDF collaboration Top Quark Properties and Searches for New Physics in the Top Sample at CDF Is it really top? We test if the top quark really does decay to a $W$ boson and a $b$ quark almost 100% of the time. We check whether the charge of the top quark is +2/3. We search for production of a 4th generation t' quark in the lepton+jets events and for anomalous events in dilepton events. We search for an anomalous rate of electron+tau or muon+tau events. We search for top decays to a charged Higgs boson. Strong Interactions The results for a test of the V-A nature of the weak interaction with a measurement of the transverse polarization of W bosons from top decays has been submitted in a separate abstract by CDF member Shulamit Moed. tollefson@pa.msu.edu
639 CDF collaboration Search for Single Top Quark Production at CDF We present the most stringent limits to date on single-top-quark production at CDF in p-pbar collisions at 1.96 TeV. Individual top quarks are expected to be produced in association with bottom quarks mainly through the exchange of an off-mass-shell W boson ($s$-channel), or the W-gluon fusion process ($t$-channel). We select events with one charged lepton, high missing transverse energy andexactly 2 jets, one of which is identified as a b-quark using the CDF Silicon detector. It is a challenge to distinguish the single top signal from significant backgrounds from W+jets processes with heavy flavour, eg Wbb, Wcc, Wc. We perform a combined search for the $s$- and $t$- channels, along with individual searches for each channel using three different analysis techniques. High-Energy Electroweak Physics tollefson@pa.msu.edu
640 CDF Top Group (speaker tba) Measurement of the Top Quark Mass in the All-hadronic Channel at CDF We present the latest measurements of the top-quark mass in the all-hadronic channel, having the final state of 6 jets, at CDF in p-pbar collisions at 1.96 TeV. Recent improvements in analysis techniques have allowed the precision in the all-hadronic mode to start contributing significantly to the overall combined top mass. We present status and prospects of three separate methods of mass determination in this challenging channel. High-Energy Electroweak Physics Note: CDF has already submitted two top mass abstracts, one each for the lepton+jets top pair decay channel, and for the dilepton decay channel. We have identified speakers for those two, the names associated with those abstracts (Jacob Linacre and Tuula Maki). If you decide to combine mass talks those two will need to fight for the talk. If you give us several top mass talks, we are suggesting here channel-by-channel might work: the two students who submitted already did so for their particular analyses but they could also give overview talks for the channel if you want. They are also happy to speak on their own specific approach. Note also we are submitting a combination/implications talk for the latest Tevatron combination, which is dominated by CDF mass measurements at the point of submission. erbacher@physics.ucdavis.edu
641 CDF Top Group (speaker tba) Top Mass World Average: Latest CDF and Tevatron Combinations, and Electroweak Implications We present a combination of the best CDF top mass measurements as of March 2007. We present also a combination by the TevEWWG (Tevatron electroweak working group) of the best top mass results from CDF and D0 in Run 1 and Run 2 of the Tevatron. This result is the current world average, and offers an uncertainty close to 1%. The new mass value has been included in traditional LEP EWWG fits to precision electroweak data, and implications for the Standard Model Higgs have been derived. High-Energy Electroweak Physics Note: This talk assumes that nobody from D0 has already submitted an abstract to cover the current top mass combination or the LEP EWWG fits containing this new top mass result. erbacher@physics.ucdavis.edu
642 Sergio Navas (for the ArDM Collaboration) Dark Matter searches with the ArDM detector The ArDM project aims at building a liquid argon detector to search for direct evidence of WIMPs as Dark Matter in the Universe. The initial goal is to assemble and operate a 1 ton LAr prototype to demonstrate the feasibility of a ton-scale experiment with the required performance to efficiently detect and sufficiently discriminate backgrounds. The actual design addresses the possibility to detect independently ionization and scintillation signals. We will describe the goal and conceptual design of the detector. Astroparticle Physics, Gravitational Waves and Cosmology navas@ugr.es
643 Claudia-Elisabeth Wulz, CMS Collaboration Status and Commissioning of the CMS Experiment The construction status of the CMS experiment at the Large Hadron Collider and strategies for commissioning the subdetectors, the magnet, the trigger system and the data acquisition are described. Calibration and alignment methods are explained. Results from the first operations of CMS as a unified system, using either cosmic rays or test data, are also presented. Detectors and Data Handling If desired, early CMS physics prospects could also be presented. claudia.wulz@cern.ch
644 H1 Collaboration A study of mini-jets in deep inelastic electron proton scattering at HERA The production of jets with low transverse momentum (mini-jets) in deep inelastic electron-proton scattering is studied. The analyses uses data taken with the H1 detector at HERA during the years 1999 to 2000. Mini-jet multiplicities are presented as a function of the transverse momentum of the leading jet, $p*_{t, lj}$, in bins of the pseudo-rapidity of the leading jet, $\eta^{lab}_{lj}$, for three regions in $Q^2$. The analysis is performed separately for the inclusive jet sample, and for a dijet sample, where the second jet is required to have an azimuthal angle larger than 140 degrees with respect to the leading jet. The dijet sample is split into two samples which are enhanced in direct photon and resolved photon processes, respectively. The results are compared to various QCD based models. Strong Interactions obehnke@mail.desy.de
645 ZEUS Collaboration Leading neutron energy and pt distributions in deep inelastic scattering The production of energetic neutrons in ep collisions has been studied with the ZEUS detector at HERA. The neutron energy and pt2 distributions were measured with a forward neutron calorimeter and tracker in a 40 pb-1 sample of inclusive deep inelastic scattering (DIS) data and a 6 pb-1 sample of photoproduction data. The neutron yield in photoproduction is suppressed relative to DIS for the lower neutron energies and the neutrons have a steeper pt2 distribution, consistent with the expectations from absorption models. The distributions are compared to HERA measurements of leading protons. The neutron enery and transverse-momentum distributions in DIS are compared to Monte Carlo simulations and to predictions of particle exchange models. Models of pion exchange incorporating absorption and additional secondary meson exchanges give a good description of the data. Strong Interactions It is a late abstract, which was forgotten halina@mail.desy.de
646 D0 Collaboration D0 Grid Computing DØ is a pioneer in grid computing for large scale production activities involving the manipulation of collider data samples. Its computing model was based on distributed computing from its origin, with progressive evolution to the use of standard common tools on the grid. A data grid (SAM) has been used since the start of Run II as the sole means of data transport (enabling local offsite analysis). The focus for the computational grid (SAMGrid) so far has been on production activities, leading finally towards user analysis as the most complex activity. Integration of SAMGrid with other grids, e.g. LCG and OSG are ongoing projects. All Monte Carlo is produced off-site, the total production for the last year was some 300 million events, with ~80% produced on LCG facilities. Periodically it is necessary to reprocess the collider data. In 2005 and 2007 we reprocessed large fractions of the Run IIa and Run IIb data sets respectively (> 1 billion events) using both LCG and OSG resources. For the latter automated forwarding nodes were operated to enable efficient access to the full grid resources. The value of grid computing to the DØ experiment is conservatively estimated at roughly $4M/year. Lessons learnt from these activities, along with our next steps will be discussed. Detectors and Data Handling Apologies for the late submission. g.j.davies@imperial.ac.uk
647 Daniela Bortoletto Search for ZH production at CDF Using $1 fb^{-1}$ of data accumulated with the CDF detector at Fermilab we have searched for Higgs bosons produced in association with a Z boson using the decays $H \rightarow b\bar{b}$ and $Z \rightarrow \nu \nu$. Having observed no excess over standard model background predictions, cross-section limits are set as a function of Higgs mass. High-Energy Electroweak Physics bortolet@exchange.purdue.edu
648 N.Tuning, on behalf of LHCb Outer Tracker Group The Performance of the Outer Tracker Detector for LHCb The LHCb experiment is a single arm spectrometer, designed to study CP violation in B-decays at the Large Hadron Collider (LHC). It is crucial to accurately and efficiently detect the charged decay particles in the high-density particle environment of the LHC. For this, the Outer Tracker (OT) is being constructed, consisting of ~55,000 straw tubes, covering in total an area of 360 m2 of double layers. At the time of the conference, the detector will be fully installed and partially equipped with readout electronics. The performance of the final detector has been checked with a beam test at DESY, Hamburg. The final read-out electronics, in terms of efficiency, position resolution, noise and cross talk has been validated and showed good performance according to the requirements. In addition, at installation the position resolution is further guaranteed by accurate alignment procedures. Finally, the detector and readout electronics quality has been scrutinized at the time of production, yielding a negligible number of bad channels. The commissioning of the detector in situ with the final readout electronics is presently on-going and preliminary results will be available at the time of the conference. Detectors and Data Handling h71@nikhef.nl
649 Robert N. Hodgkinson, Apostolos Pilaftsis Radiative Yukawa Couplings for Supersymmetric Higgs Singlets at Large tan(beta) Singlet Higgs bosons present in extensions of the MSSM can have sizable Yukawa couplings to the b quark and the tau lepton for large values of tan(beta) at the 1-loop level. We present an effective Lagrangian which incorporates these tan(beta)-enhanced Yukawa couplings and which enables us to study their effect on singlet Higgs-boson phenomenology within the context of both the mnSSM and the NMSSM. In particular, we find that the loop-induced coupling can be a significant effect for the singlet pseudoscalar, and may dominate its decay modes. Further implications of the tan(beta)-enhanced Yukawa couplings for the phenomenology of the singlet Higgs bosons are briefly discussed. Physics Beyond the Standard Model neil@hep.man.ac.uk
650 Massimiliano Chiorboli Search for Supersymmetry in the first months of LHC data taking We present the studies performed in order to evaluate the capability of the CMS detector to discover supersymmetric particles with data collected in the first months of the LHC running period. A full simulation of the detector has been used, with a deep attention devoted to the understanding of possible sources of systematic uncertainties. Results are shown for different topologies: final states including different combinataions of leptons, jets, and missing transverse energy are considered. For each topology, the obervability research in the mSUGRA parameter space is given. Physics Beyond the Standard Model massimiliano.chiorboli@ct.infn.it
651 Massimiliano Chiorboli (on behalf of the CMS collaboration) Search for Supersymmetry in the first months of LHC data taking We present the studies performed in order to evaluate the capability of the CMS detector to discover supersymmetric particles with data collected in the first months of the LHC running period. A full simulation of the detector has been used, with a deep attention devoted to the understanding of possible sources of systematic uncertainties. Results are shown for different topologies: final states including different combinatations of leptons, jets, and missing transverse energy are considered. For each topology, the observability research in the mSUGRA parameter space is given. Physics Beyond the Standard Model massimiliano.chiorboli@ct.infn.it
652 David Tucker-Smith Mixed-sneutrino dark matter at the LHC In supersymmetric theories with right-handed neutrinos, new possibilities open up for dark matter. I will discuss a scenario in which right-handed sneutrinos with weak-scale masses mix with left-handed sneutrinos through weak-scale A terms. In this case the lightest sneutrino mass eigenstate is a viable dark matter candidate. After discussing the constraints on this model from requiring the correct relic abundance and from direct-detection experiments, I will present an analysis of signatures of this scenario at the LHC. The NLSP typically decays promptly, so the phenomenology is distinct from the recently studied case where the LSP sneutrino is almost entirely right-handed. Possible signatures include like-sign dileptons with a rather unusual invariant mass distribution, from cascades involving the decay of the lightest neutralino, and Higgs or Z bosons from the decays of the heavier sneutrinos to the lighter ones, produced in association with leptons. Physics Beyond the Standard Model dtuckers@williams.edu
653 CMS Higgs WG Discovery Potential for the SM Higgs Boson in the H -> WW* -> 2l2nu channel at the LHC The prospects for the search of the Standard Model Higgs boson in the decay channel H -> WW* -> l nu l' nu' (l or l' = e or mu) with the CMS experiment at the LHC is presented. The analysis relies on a full simulation of the detector response and emphasis is put on explicit strategies for the measurement of experimental and background systematics from data. A discovery reach with a significance above 5 standard deviations is expected for Higgs boson masses MH in the range 150 < MH < 180 GeV/c2 for an integrated LHC luminosity of 10 fb-1, and around MH ~ 165 GeV/c2 for a luminosity of 1 fb-1. An observation with a significance above 3 standard deviations is expected in the e e nu nu channel alone for masses MH >~ 134 GeV/c2 for an integrated LHC luminosity of 30 fb-1. High-Energy Electroweak Physics yves.sirois@in2p3.fr, anikiten@mail.cern.ch
654 CMS Higgs WG Search for the SM Higgs Boson in the H -> ZZ* in 4 leptons at the LHC A prospective analysis for the search of the Standard Model Higgs boson in the decay channel H -> ZZ* -> 4 leptons (4e, 4mu or 2e2mu) is presented with the CMS experiment at the LHC. The analysis relies on a full simulation of the detector response and emphasis is put on explicit strategies for the control of experimental systematics and of physics background systematics from data. The H to ZZ* channel offers a discovery reach with a significance exceeding 5 standard deviations already for LHC integrated luminosities of 10 fb-1 in a wide range of possible Higgs boson mass, from about 130 to 500 GeV/c2. Documents ZZ*: CMS Notes 2006/106, 2006/107, 2006/115, 2006/122, 2006/136 Documents WW*: Documents: CMS Notes 2006/047, 2006/048, 2006/114 High-Energy Electroweak Physics yves.sirois@in2p3.fr, anikiten@mail.cern.ch
655 CMS Higgs WG Inclusive Search for the SM Higgs Boson in the H -> gamma gamma channel at the LHC A prospective for the inclusive search of the Standard Model Higgs boson in the decay channel H -> gamma gamma is presented with the CMS experiment at the LHC. The analysis relies on a strategy to determine the background characteristics and systematics from data. The strategy is applied to a Monte Model of the QCD background, with full simulation of the detector response. The discrimination between signal and background exploits information on photon isolation and kinematics. The resolution for the reconstructed Higgs boson mass profits from the excellent energy resolution of the CMS crystal calorimeter. A discovery significance above 5 sigma is expected at integrated LHC luminosities below 30 fb-1 for Higgs boson masses below 140 GeV/c^2. Documents: CMS Note 2006/112 High-Energy Electroweak Physics yves.sirois@in2p3.fr, anikiten@mail.cern.ch
656 CMS Higgs WG Search for the VBF Production of SM Higgs Boson at the LHC Prospective analyses presented with the CMS experiment at the LHC for the search of the Standard Model Higgs boson produced in vector boson fusion processes, p p -> qq H, where the Higgs boson is accompanied by two high rapidity jets. Results are discussed for the H -> gamma gamma, WW and tau tau decay channels for an integrated LHC luminosity of 30 fb-1. For a Higgs boson mass MH in the range 115 to 140 GeV/c^2, an observation with a significance above 2 standard deviations is expected in the H to gamma gamma channel, and above 3 standard deviations in the H to tau tau channel. The H to WW channel offers a discovery reach above 5 sigma in the range 140 < MH < 200 GeV/c2. Documents: CMS Note 2006/088, 2006/091,2006/092, 2007/097 High-Energy Electroweak Physics yves.sirois@in2p3.fr, anikiten@mail.cern.ch
657 CMS Higgs WG Observability of the SM Higgs produced in association with a top pair The prospects for the search of the SM Higgs in the associated tt H production mode with the CMS experiment at the LHC is presented. The search for the H -> bb decay is made conceivable in this production mode given the presence of two additional high PT b jets from the t -> Wb decays and the possibility to select events with at least one leptonic W decay (l = e or mu). Establishing a significant excess in this channel is found to be very challenging even for integrated LHC luminosities of up to 60 fb-1. Documents: CMS Note 2006/119 High-Energy Electroweak Physics yves.sirois@in2p3.fr, anikiten@mail.cern.ch
658 CMS Higgs WG Search for the MSSM Neutral Higgs bosons in the H -> tau tau channel at the LHC The prospects for the discovery of the MSSM Neutral Higgs A/H bosons in the A/H -> 2 tau decay channel with the CMS experiment at the LHC are presented . The analysis relies on a full simulation of the detector response at the LHC luminosity of 2 x 10^33 cm-2 s-1. All combinations of leptonic and semi-leptonic ("jet") decays of the tau leptons are considered. Discovery domains at the 5 standard deviation level are presented in the tan(beta) vs MA plane of the MSSM parameter space. A discovery reach extending down to tan(beta) ~ 13 around MA ~ 200 GeV has been obtained for the lepton + jet + X final states. Documents: CMS Notes 2006/075, 2006/101, 2006/105, 2006/126 Physics Beyond the Standard Model yves.sirois@in2p3.fr, anikiten@mail.cern.ch
659 CMS Higgs WG Search for the MSSM Charged Higgs bosons at the LHC The prospects for the discovery of the MSSM charged Higgs H+- bosons with the CMS experiment at the LHC are presented. The analysis relies on a full simulation of the detector response at the LHC luminosity of 2 x 10^33 cm-2 s-1. Light charged Higgs bosons are searched in top pair production via the t -> Hb decay channel in the mass range 125 < MH < 170 GeV/c2. Heavy charged Higgs are searched in single production modes via top-bottom fusion. The analyses are performed in the H -> tau nu decay mode. Discovery reach at the 5 standard deviation level are presented in the tan(beta)-MA plane of the MSSM parameter space. Documents: CMS Notes 2006/056, 2006/100, 2006/109 Physics Beyond the Standard Model yves.sirois@in2p3.fr, anikiten@mail.cern.ch
660 OPAL Collaboration Search for invisibly decaying Higgs bosons A search for invisible decay of Higgs bosons produced in the Higgsstrahlung process in e+e- collisions at LEP is performed using data taken by the OPAL detector at centre of mass energies between 183 and 209 GeV. The analysisis motivated by models predicting the decay of the Higgs boson into a pair of stable weakly interacting neutral particles, such as the lightest neutralino in the Minimal Supersymmetric Standard Model. The same selection is applied to search for nearly invisible decays of the Higgs boson resulting from a cascade decay to a stable weakly interacting neutral particle, H -> X Y -> X X Z*. No excess of events over the expected background from Standard Model processes is observed. Limits on the production cross-section of invisibly decaying Higgs bosons produced in association with a Z boson are derived. Assuming a branching ratio BR(H -> invisible) = 1, a lower bound on the Higgs boson mass is placed at the 95% confidence level. Limits on the production of nearly invisibly decaying Higgs bosons are also given. Physics Beyond the Standard Model opal-physics-coordinators@cern.ch
661 OPAL Collaboration Search for Dirac Magnetic Monopoles in e+e- Collisions with the OPAL Detector at LEP2 A direct search for pair produced magnetic monopoles in e+e- collisions at LEP is reported. The analysis is based on 62.7 pb^{-1} of data collected with the OPAL detector at an average centre-of-mass energy of sqrt(s) = 206.3 GeV. The monopole signal was assumed to be characterized by two back-to-back tracks with an anomalously high ionization energy loss dE/dx in the tracking chambers. No evidence for production of monopoles was observed in the analysed data set. Upper limits were obtained on the magnetic monopole pair-production cross-section in the mass range 45 GeV/c^{2} < m_M <102 GeV/c^{2}. The cross-section limit is derived at the 95 % confidence level and is valid for spin-1/2 magnetic monopoles. Physics Beyond the Standard Model opal-physics-coordinators@cern.ch
662 the CMS Collaboration Perspectives for heavy stable charged particles searches in CMS Many models of physics beyond the Standard Model predict the existence of heavy stable electrically and colored charged particles. The 14 TeV proton proton collisions produced by the Large Hadron collider would open the way to the production of these particles with masses up to several hundreds of GeV. The CMS experiment is capable of performing a direct observation of such particles by means of two independent techniques based on the detection of non-relativistic and high momentum particles. One of them uses the drift chambers of the muon system to measure both the particle momentum and its time of flight. The other one uses the information of the inner tracker silicon detectors to measure both the particle momentum and the energy loss, from which the mass of the particle can be inferred. Online event selection and offline reconstruction are discussed with emphasis on relevant backgrounds and sources of errors on the mass measurement. The domains of parameter space for different models where exclusions or discoveries can be performed by CMS in the first year of LHC operation are also presented. Physics Beyond the Standard Model submitted on behalf of the CMS collaboration smaria@cern.ch
663 the CMS Collaboration Extra Dimensions and New Vector Boson Searches in CMS We present the CMS experiment potential to discover heavy resonances decaying into an electron-positron pair, such as Kaluza-Klein excitations of a Z or graviton boson predicted in extra dimension models (the TeV-1 model and the Randall-Sundrum model). Six models of neutral heavy Z' boson predicted by Grand Unified Theories are also considered here. Full and fast simulation and reconstruction are used to investigate these productions, with the luminosity conditions corresponding to the LHC start-up and to 2×1033. A comparison is given with the discovery potential into gamma-gamma and muon-muon final states. Physics Beyond the Standard Model submitted on behalf of the CMS collaboration smaria@cern.ch
664 Andreas Freise for the GEO 600 collaboration The GEO600 Detector: Status and Plans For most of 2006 and the beginning of 2007 the interferometric gravitational-wave detector GEO 600 in Hannover, Germany participated in the fifth scientific data taking of the LSC (S5). The peak strain sensitivity at frequencies of around 550Hz was better than 3e-22 /sqrt(Hz). In this talk we will present the performance of GEO 600 in S5 in the period from January 2006 to May 2007 and discuss the plans for the future development of the detector. Astroparticle Physics, Gravitational Waves and Cosmology adf@star.sr.bham.ac.uk
665 David Tucker-Smith Mixed-sneutrino dark matter at the LHC In supersymmetric theories with right-handed neutrinos, new possibilities open up for dark matter. I will discuss a scenario in which right-handed sneutrinos with weak-scale masses mix with left-handed sneutrinos through weak-scale A terms. In this case the lightest sneutrino mass eigenstate is a viable dark matter candidate. After discussing the constraints on this model from requiring the correct relic abundance and from direct-detection experiments, I will present an analysis of signatures of this scenario at the LHC. The NLSP typically decays promptly, so the phenomenology is distinct from the recently studied case where the LSP sneutrino is almost entirely right-handed. Possible signatures include dileptons with a rather unusual invariant mass distribution, from cascades involving the decay of the lightest neutralino, and Higgs or Z bosons from the decays of the heavier sneutrinos to the lighter ones, produced in association with leptons. Strong Interactions This abstract corrects a previously submitted version (dileptons are opposite sign, not same sign!) dtuckers@williams.edu
666 David Tucker-Smith Mixed-sneutrino dark matter at the LHC In supersymmetric theories with right-handed neutrinos, new possibilities open up for dark matter. I will discuss a scenario in which right-handed sneutrinos with weak-scale masses mix with left-handed sneutrinos through weak-scale A terms. In this case the lightest sneutrino mass eigenstate is a viable dark matter candidate. After discussing the constraints on this model from requiring the correct relic abundance and from direct-detection experiments, I will present an analysis of signatures of this scenario at the LHC. The NLSP typically decays promptly, so the phenomenology is distinct from the recently studied case where the LSP sneutrino is almost entirely right-handed. Possible signatures include dileptons with a rather unusual invariant mass distribution, from cascades involving the decay of the lightest neutralino, and Higgs or Z bosons from the decays of the heavier sneutrinos to the lighter ones, produced in association with leptons. Physics Beyond the Standard Model This abstract corrects a previously submitted version (dileptons are opposite sign, not same sign!) dtuckers@williams.edu
667 Tobias Huber, Tobias Hurth, Enrico Lunghi, Mikolaj Misiak, and Daniel Wyler Electromagnetic corrections to the inclusive rare decay $\bar B -> X_s \ell^+ \ell^-$ The inclusive rare decay $\bar B -> X_s \ell^+ \ell^-$ as a flavor changing neutral current (FCNC) process is suppressed in the Standard Model (SM) and therefore highly sensitive to new degrees of freedom. In comparison to the $\bar B -> X_s \gamma$ decay, it presents a complementary and also more complex test of the SM. The decay $\bar B -> X_s \ell^+ \ell^-$ is particularly attractive because of kinematic observables such as the invariant dilepton-mass spectrum and the forward-backward asymmetry (FBA). In order to increase the sensitivity to new physics, there is need for higher precision both on the experimental and theoretical side. On the theoretical side, the calculation of NNLL QCD corrections and the inclusion of non-perturbative contributions like $1/m_b^2$ and $1/m_c^2$ corrections have resulted in a precision of smaller than $10\%$ in the aforementioned observables. However, there is a $\pm 4$\% scale uncertainty coming from a global prefactor $\alpha_{\mathrm em}(\mu)^2$. We remove this scale uncertainty by calculating electromagnetic corrections to the Wilson Coefficients, thereby confirming earlier findings of Bobeth et al.. Furthermore, we complete the calculation of logarithmically enhanced electromagnetic effects by including also QED corrections to the matrix elements of four-fermion operators for all observables. Such corrections contain a collinear logarithm $\ln(m_b^2/m_\ell^2)$ that gives sizable contributions. We present a complete phenomenological analysis of the dilepton mass spectrum and the FBA integrated in the low- and high dilepton-mass region respectively, including a precise prediction of the zero of the FBA since it represents one of the most precise predictions in flavour physics with a theoretical uncertainty of order 5\%. We also elaborate on the role which collinear photons radiated off final state leptons play in our analysis and how this can affect the current BaBar and Belle treatments of such collinear photons. Recently, a third independent observable was identified by Ligeti et. al.. The values of all three observables integrated over the low dilepton-mass region will become important precision observables towards the end of the B factories. We will also elaborate on this issue. Flavour Physics and CP Violation thuber@physik.rwth-aachen.de
668 Gaston Wilquet for the OPERA Collaboration Status the OPERA experiment and analysis of the first CNGS neutrino beam events The OPERA neutrino detector at the underground Gran Sasso Laboratory (LNGS) was designed to perform the first detection of neutrino oscillations in appearance mode, through the study of numu - nutau oscillations. The apparatus consists of a lead/emulsion-film target complemented by electronic detectors. It is aligned in the high-energy, long-baseline CERN to LNGS beam (CNGS) 730 km away from the neutrino source. In August 2006, a short run with CNGS neutrinos was successfully conducted. A first sample of neutrino events was collected, statistically consistent with the integrated beam intensity. After having recalled the physics goals and briefly described the beam, the experimental concept and the detector components, we report here on the achievement of this milestone by presenting the analysis of these first data. We conclude with the current status of the detector and the beam and with the foreseen schedule of the experiment. Neutrino Physics These abstract supersedes the abstract on a similar subject submitted by Antonio Ereditato Gaston.Wilquet@ulb.ac.be
669 Marcos Fenandez Garcia The CMS muon detector and the 2006 Magnet Test and Cosmic Challange results The CMS muon barrel system uses two technologies in order to reconstruct and trigger muon particles. Drift Tubes (DT) are used to measure the momentum of the muons inside the 4 Tesla magnetic field of the experiment and to trigger them. Resistive Plate Chambers (RPC) are used as a dedicated trigger detector. The redundancy of the devices used to select muons make the muon trigger system very roboust against the machine backgrounds and the DT chambers permit an efficient and precise measurement of the particle cinematic. During summer 2006 the first integrated test of a slice of the CMS detector and of the Magnet solenoid has been performed (Magnet Test and Cosmic Challange MTCC). Two muon barrel sectors and a 60 degree region of the muon endcap have been operative and millions of cosmic ray events have been collected in order to check the system performances. The main goal of this Challage has been to test the magnet solenoid and to verify the capability of the different detectors to operate as a single system. The large number of cosmic muons collected has made possible to check the detection efficiency, the reconstruction capability and trigger performances of the muon system. At same time the detector control and the Data Quality Monitor have been continuously running in order to study the reliability of the detectors. Data have been collected both with standalone RPC trigger and with the trigger provided by the Drift Tube system in order to study in an un-biased way the detector performances. In this talk an overview of the system layout and a summary of the results obtained during the MTCC will be given. Detectors and Data Handling Marcos.Fernandez@cern.ch
670 Alessia Tricomi on behalf of the LHCf collaboration LHCf: a LHC Detector for Astroparticle Physics Many of the experimental procedures used to derive the energy spectra of the incoming cosmic rays depend strongly on the nuclear interaction model used in the Monte Carlo codes of the air showers. Several open questions in cosmic ray physics may profit from an accurate knowledge and calibration of Monte Carlo models with real data at the highest possible energy. The LHCf experiment which will take data at the LHC collider at a centre of mass energy of 14 TeV equivalent to 10^17eV in the laboratory frame will provide a calibration of nuclear interaction models with real data up to an energy relevant enough that a firm base for the investigation of the GZK problem can be posed. Astroparticle Physics, Gravitational Waves and Cosmology alessia.tricomi@ct.infn.it
671 Nikolaos Kidonakis Soft-gluon corrections in single top quark production at the Tevatron and the LHC I present a calculation of soft-gluon corrections through next-to-next-to-next-to-leading order (NNNLO) for single top quark production at the Tevatron and LHC colliders. I show results separately for the t-channel, s-channel, and associated tW production processes. The corrections are significant for the s-channel and for tW production, but smaller for the t-channel processes. High-Energy Electroweak Physics nkidonak@kennesaw.edu
672 Nikolaos Kidonakis Soft-gluon corrections in single top quark production at the Tevatron and the LHC I present a calculation of soft-gluon corrections through next-to-next-to-next-to-leading order (NNNLO) for single top quark production at the Tevatron and LHC colliders. I show results separately for the t-channel, s-channel, and associated tW production processes. The corrections are significant for the s-channel and for tW production, but smaller for the t-channel processes. High-Energy Electroweak Physics nkidonak@kennesaw.edu
673 Bruny Baret for the IceCube Collaboration Astroparticle physics with the Amanda neutrino telescope The AMANDA neutrino telescope at the South Pole has been taking data successfully since 1997. This detector opened a new window on to a wide range of physics including atmospheric neutrinos, indirect searches for WIMP dark matter, magnetic monopoles and possible astrophysical sources of high energy neutrinos such as gamma ray bursts and active galactic nuclei. With the detection of several thousand atmospheric neutrinos it has proven the feasibility of using the South Polar icecap as a Cherenkov medium for the detection of high energy neutrinos, and provided much useful technical information relevant for its successor experiment IceCube. We will present a summary of the various searches performed and the increasingly stringent limits obtained over many years of operation. Astroparticle Physics, Gravitational Waves and Cosmology bruny.baret@vub.ac.be
674 Uhlig, Selma Minimal Lepton Flavour Violation and Leptogenesis and the specific case of exclusively low-energy CP Violation We analyze lepton flavour violation (LFV), as well as generation of the observed baryon-antibaryon asymmetry of the Universe (BAU) within a generalized minimal lepton flavour violation (MLFV) framework as proposed recently in the literature. We allow for CP violation both at low and high energies. The BAU is obtained through radiative resonant leptogenesis (RRL) which is successful widely independent of the Majorana scale (Branco et al, hep-ph/0609067). Flavour specific effects are relevant. Then the specific case of exclusively low-energy CP violation (a real R matrix) is discussed, leading to strong constraints for a successful leptogenesis (Uhlig, hep-ph/0612262). Physics Beyond the Standard Model suhlig@ph.tum.de
675 T. Huege for the LOPES Collaboration Radio detection of cosmic ray air showers with the LOPES experiment In the last few years, radio detection of cosmic ray air showers has experienced a true renaissance. In particular, the LOPES project has successfully implemented modern interferometric methods to measure radio emission from extensive air showers. LOPES has confirmed that the emission is coherent and of geomagnetic origin, as expected by the geosynchrotron mechanism, and has demonstrated that a large scale application of the radio technique has great potential to complement current measurements of ultra-high energy cosmic rays. We describe the current status and most recent results of the LOPES project and discuss the open questions regarding radio detection of cosmic rays. Astroparticle Physics, Gravitational Waves and Cosmology tim.huege@ik.fzk.de
676 Jeff Forshaw and Malin Sjodahl Soft gluons in Higgs plus two jet production I will talk about soft gluon resummation in the context of qq -> qqH. Not surprisingly, the probability for additional gluon emission depends critically on whether the underlying hard process is a colour octet exchange, as in qq -> qqH via gluon fusion, or a colour singlet exchange, as in qq -> qqH via weak boson fusion. This can be used to experimentally discriminate between these channels of Higgs production at the LHC. Performing the all order soft gluon resummation also allows us to calculate the interference between the two processes. Strong Interactions malin.sjodahl@manchester.ac.uk
677 Hannes Sakulin First Cosmic Data Taking with the Compact Muon Solenoid Experiment at CERN During the second half of 2006 a first combined test of almost all sub-systems of the Compact Muon Solenoid (CMS) experiment at CERN’s new Large Hadron Collider has been performed. Partial configurations of almost all initially included sub-detectors and the Level-1 Trigger were successfully integrated with a scaled-down setup of the central Data Acquisition (DAQ) and Run Control systems. The DAQ system included the full chain of readout, two stages of event building, event filtering, storage to disk and data transfer to the Tier-0 computing center. This paper reports on the integration, commissioning and successful operation of the central DAQ and Run Control systems during which valuable experience was gained for the currently ongoing commissioning of the full-scale system. Detectors and Data Handling Samim.Erhan@cern.ch, Hannes.Sakulin@cern.ch
678 M.G. Catanesi et al., Harp collaboration Hadroproduction in targets of materials ranging from Beryllium to Lead One of the main motivation of the HARP experiment is to measure pion yields for a quantitative design of a proton driver of a future neutrino factory. At the moment the CERN scenario make provision for a 3 or 5 GeV/c proton linac with an high-Z target. For momenta below 10 GeV/c the different hadron production Monte Carlo generators exhibit discrepancies in the total yields evaluation and in the relative abundance of negative and positive particles. These discrepancies become larger at lower incoming proton energy (3-5 GeV/c). We report the measurement of the differential cross-section for pions (both polarities) obtained using an incident proton beam from 3 GeV/c to 12 GeV/c impinging a 5% nuclear interaction length target ranging from Berillium to Lead, with a large acceptance. The secondary yield for pions of both signs is in the theta range between 0.35 and 2.0 rad and between 100 MeV/c and 700 MeV/c in total momentum. This phase space region is the most interesting one for the design of the proton driver of a future neutrino factory as well as for the desing of neutrino SuperBeams. Accelerator RD and Technology mezzetto@pd.infn.it
679 I.Vorobiev (on behalf of CMS Endcap Muon group) CMS Endcap Muon System (CSC, Cathode Strip Chambers). We describe recent status of CMS Endcap Muon System (Cathode Strip Chambers, CSC), tests carried out and the performance of the system. Physical examples are given, stressing the importance of the subdetector both for first low luminosity physics and for descovery potential of the CMS. Detectors and Data Handling First we describe shortly the Endcap Muon system and its design properties and goals. Then - current status. Production and installation of CSC chambers is finished. Chambers on endcap disks are downloaded into underground experimental hall. Intensive phase of commissioning and integration is under way. Services are installed - cabling, HV, LV, electronics, firmware and so on (or under installation; all this will be told according to situation by the end of July). Previously the system was extensively tested with time-structured test beam (25 nsec between bunch crossings) and in Magnetic Test and Cosmic Challenge (MTCC). Obtained results about efficiency, time and spatial resolution, gas gain stability, efficiency of muon segment reconstruction, trigger performance are presented. They well meet design requirements. Software services were installed and tested: Detector Control System (DCS), Data Quality Monitoring (DQM), databases. Calibration procedures were installed and tested, calibration constants are measured, transfered to offline and used in analysis. Examples of physical processes are given, where Endcap Muon system is of great importance: decay of Higgs with four muons and two muons in final state, Z'-> mu mu. Physics at low luminosity: W and Z production, J/psi, top, B-physics. igor.vorobiev@cern.ch
680 M.G. Catanesi et al., Harp collaboration Harp results for the prediction of the K2K and MiniBoone neutrino beam lines The HARP experiment at CERN is performing extensive measurements of cross sections and secondary particle yields in the energy range 2-15 GeV/c as close as possible to full angular coverage, and full particle identification using a large set of cryogenic and solid (thin and thick) target. Harp have successfully collected 30 TB of data in 2 years. We will report about the double differential production cross section for pions produced by protons of 12.9 GeV/c momentum hitting an aluminum target and for pions produced by protons of 8.9 GeV/c hitting a Beryllium target, both 5% nuclear interaction length thick. The first measurement has a direct application to the calculation of the neutrino flux of K2K experiment and in particular on the far/near ratio.The error on the calculation of this ratio, associated with the HARP measurement (including statistical and systematic errors) shows a considerable improvement respect to the current K2K analysis. The second one has an immediate interest for the MiniBoone and SciBoone experiments allowing the precise prediction of the neutrino flux. Both data sets were fitted with a Sanford-Wang parametrization. Neutrino Physics mezzetto@pd.infn.it
681 Guillaume MENTION, Thierry LASSERRE, Dario MOTTA A unified analysis of the reactor neutrino program towards the measurement of the theta_13 mixing angle I will present a quantitative comparison of currently scheduled reactor neutrino experiments for the measurement of the leptonic mixing angle theta_13: Daya Bay, Double Chooz and RENO. This unified investigation is performed with respect to systematic errors and background impacts on the theta_13 sensitivity for each detailed experimental setup. Based on the pull analysis, I will discuss about the advantages and drawbacks of each experimental setup. Neutrino Physics guillaume.mention@cea.fr
682 H. Ulrich for the KASCADE collaboration Status of the KASCADE-Grande experiment The KASCADE-Grande experiment, located on the area of the Forschungszentrum Karlsruhe, Germany, measures extensive air showers in the energy range between 5\times 10^{14} and 10^{18} eV, thus covering the first and the possible second knee of cosmic rays. Main components of the installation are the Grande array, consisting of 37 scintillation detectors of 10 sqm each, and the 252 detector stations of the original KASCADE array. The KASCADE array is arranged on a 200x200 sqm grid, whereas the Grande array covers an area of 700x700 sqm, thus extending the accessible energy range. Main goals of the experiment are investigations of the knee at around 4 PeV and the verification of the existence of an expected `iron´ knee at energies around 100 PeV. Furthermore, the energy range beyond 100 PeV is of special interest since the transition from galactic to extragalactic cosmic rays is expected at these energies. In this overview the apperatus, its performance, reconstruction of measured data, and first results will be presented. Astroparticle Physics, Gravitational Waves and Cosmology holger.ulrich@ik.fzk.de
683 CDF Collaboration New measurments of Heavy Quark Cross Sections at a center-of-mass energy of 1.96 TeV We present new measurements of heavy quark production cross sections in p p= collisions at a center-of-mass energy of 1.96 TeV. These measurments include - the study of prompt charm meson pair production where both charm mesons are fully reconstructed in hadronic decay modes and orrelations of the two charm mesons are used to study heavy-quark production dynamics - measurement of the B+ meson differential cross section dsigma/dpT from fully reconstructed B -> J/Psi K+ decays - a study of correlated bb= production cross section using dimuon correlations - a measurement of the B Meson Production Cross Section using B->mu- D0 X Flavour Physics and CP Violation finally submitted paulini@cmu.edu, douglasg@fnal.gov
684 CDF Collaboration Branching Fractions and Direct CP Asymmetries of Charmless B Decay Modes at the Tevatron We present new CDF results on the branching fractions and time-integrated direct CP asymmetries for B0 and B0(s) decay modes into pairs of charmless charged hadrons (pions or kaons). The data-set for this update amounts to fb-1 of p anti-p collisions at a center of mass energy 1.96 TeV. We report the first observation of the B0(s) --> K- pi++ mode and a measurement of its branching fraction an direct CP asymmetry. We also observe for the first time two charmless decays of the Lambda_b-baryon: Lambda0(b) --> p pi+- and Lambda0(b) --> pK-. Flavour Physics and CP Violation finally submitted paulini@cmu.edu, douglasg@fnal.gov
685 CDF Collaboration Observation of B0(s)-B-bar0_s Oscillations We report the observation of B0(s)-B-bar0_s oscillations from a time-dependent measurement of the B0(s)-B-bar0_s oscillation frequency Delta m_s. Using a data sample of 1 fb-1 of p anti-p collisions at s**(1/2) = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron, we find signals of 5600 fully reconstructed hadronic B_s decays, 3100 partially reconstructed hadronic B_s decays, and 61,500 partially reconstructed semileptonic B_s decays. We measure the probability as a function of proper decay time that the B_s decays with the same, or opposite, flavor as the flavor at production, and we find a signal for B0(s)-B-bar0_s oscillations. The probability that random fluctuations could produce a comparable signal is 8 x 10-8, which exceeds 5 sigma significance. We measure Delta m_s = 17.77 +/- 0.10 (stat) +/- 0.07 (syst) ps-1 and extract |V_td/V_ts| = -.2060 +/- 0.0007 (exp)+0.0081_-0.0060 (theor). Flavour Physics and CP Violation finally submitted paulini@cmu.edu, douglasg@fnal.gov
686 CDF Collaboration CP Violation Measurements at CDF We present the latest results on CP violation measurement from CDF> These include: - a measurment of sin(2beta) from B0 -> J/Psi K0s decays - a high-precision measurement of the inclusive $CP$ asymmetry in same sign dimuon events originating from two semileptonic $B$~hadron decays - a search for a CP charge asymmetry in B+ -> J/Psi K+ decays Flavour Physics and CP Violation finally submitted paulini@cmu.edu, douglasg@fnal.gov
687 CDF Collaboration Lifetime Difference and CP Asymmetry in the Bs0 -> J/Psi phi Mode We report on the progress of the analysis of $B^0_s \to J/\psi \phi$ decays to extract the parameters $\Delta \Gamma_s / \Gamma_s$ and $\sin 2 \beta_s$ with the CDF\,II detector. The use of a time-dependent angular analysis can separate the $CP$~eigenstates of the $B^0_s$~meson to determine their separate lifetimes. Further tagging of the $B^0_s$ meson at time $t=0$ as $B^0_s$ or $\bar{B}^0_s$, allows for the analysis of the $CP$ asymmetry, which then yields the $\sin 2 \beta_s$ parameter. The $\Delta \Gamma_s$ measurement is an improved analysis using additional data, neural network selection for better signal/background, and reduced systematic errors. Flavour Physics and CP Violation finally submitted paulini@cmu.edu, douglasg@fnal.gov
688 CDF Collaboration Measurement of B Hadron Lifetimes at CDF We present updated measurements of exclusive B lifetimes in various fully reconstructed B hadrons modes. These include the modes B -> J/Psi X, where X is either K+, K0s, K*0, phi or Lambda. We review also review new B0s and Lambda0(b) lifetime measurements in fully reconstructed hadronic decay modes. We also present a measurement of the $B^+$ and $B^0$ lifetime using a Monte-Carlo free approach. Flavour Physics and CP Violation finally submitted paulini@cmu.edu, douglasg@fnal.gov
689 CDF Collaboration Search for rare B and D hadron decays at CDF We present the current status of rare B decay searches B0(s) --> mu+ mu-, B0 --> mu+ mu-, B+ --> K+ mu+ mu-, B0 --> K*0 mu+ mu-, B0(s) --> phi mu+ mu-, D0 -> mu mu as well as other rare B and D decay modes at CDF oprating at the Fermilab Tevatron. Flavour Physics and CP Violation finally submitted paulini@cmu.edu, douglasg@fnal.gov
690 CDF Collaboration Measurement of b Baryons with the CDF Detector Recently the CDF Collaboration reported the first observation of the bottom baryon states Sigma_b. Using ~1 fb-1 of CDF data, we present an update on the Sigma_b result based on an enlarged data sample of fully reconstructed Lambda_b decays collected by the CDF~II detector using several trigger paths. We also report on searches for other bottom baryons. Flavour Physics and CP Violation finally submitted paulini@cmu.edu, douglasg@fnal.gov
691 Inés Gil Botella Status of the Double Chooz reactor experiment The Double Chooz reactor neutrino experiment will be the next detector to search for a non vanishing q13 mixing angle with unprecedented sensitivity, which might open the way to unveiling CP violation in the leptonic sector. The measurement of this angle will be based in a precise comparison of the antineutrino spectrum at two identical detectors located at different distances (280 m and 1.05 km) from the Chooz nuclear reactor cores in France. Double Chooz is particularly attractive because of its capability to explore sin2(2q13) down to one order of magnitude below the current limit (i.e. to 0.03 @ 90% C.L. for DM2=2.5 x 10-3 eV2) in three years of data taking. The experiment will start in 2008 with the operation of the far detector followed 1.5 years later by the near detector. In this talk, I will review the current status of the Double Chooz experiment, its physics potential and the design and expected performance of the detector. Neutrino Physics ines.gil@ciemat.es
692 M.Leuthold for the Auger Collaboration Search for anisotropies at energies above 1 EeV with the Pierre Auger Observatory The analysis of the arrival directions of ultra high energy cosmic rays is the most promising way to identify their sources. The talk will present how the Pierre Auger Observatory is used as a telescope for charged particle astronomy. We use more than two years of data to search for anisotropies such as large scale patterns, auto correlation and correlations with cosmic objects in different energy windows above 1 EeV. Astroparticle Physics, Gravitational Waves and Cosmology leuthold@physik.rwth-aachen.de
693 Iulian C. Bandac for the CUORE Collaboration, University of South Carolina and Laboratori Nazionali del Gran Sasso Search for neutrinoless Double Beta Decay with the CUORE detector CUORE is a 1-ton experiment to search for neutrinoless Double Beta Decay of Te-130 using 988 TeO2 bolometers. It aims at reaching the sensitivity on the effective neutrino mass of the order of few tens of meV. CUORICINO, a single CUORE tower running since 2003 in the Gran Sasso Underground Laboratory (Italy), plays an important role as a standing alone experiment for developing the future CUORE setup. CUORICINO is the most sensitive running detector to search for double beta decay. The latest limit obtained on the Majorana mass is presented. The R&D effort in improving the detector sensitivity and background reduction is also reported. Neutrino Physics iulian.bandac@lngs.infn.it
694 Vit Vorobel Precise measurement of reactor antineutrino oscillations at Daya Bay The Daya Bay Reactor Neutrino Experiment is designed to determine the least-known neutrino mixing angle theta13 with a sensitivity to (sin(2theta13)**2 of better than 0.01 at 90% CL. The experiment will search for the disappearance of electron antineutrinos from the nuclear reactor complex. The planned sensitivity will be achieved in three years of data-taking with multiple detectors at different baselines. In this talk, I will present an overview and current status of the experiment. Neutrino Physics vit.vorobel@mff.cuni.cz
695 Giovanni Andrea Prodi (for the IGEC2 Collaboration) The observatory of resonant detectors of gravitational waves: current searches and prospects The network of resonant bar detectors of gravitational waves is searching for transient gravitational waves (GWs) within the International Gravitational Event Collaboration (IGEC-2). We review the latest results of this survey using 2005-2006 data when at least three bar detectors were observing. Thanks to the high duty cycle and the stability of the performances of the participating detectors, this observatory covers an high fraction of the time with a false detection rate as low as 1 per century, allowing the identification of any single candidate of GW with high statistical confidence. We overview the prospects for joint observations with interferometric detectors of gravitational waves, for multimessenger observations and for a new generation of acoustic detectors featuring a wide-band sensitivity to GWs. Astroparticle Physics, Gravitational Waves and Cosmology depending on the scheduled time, the last topics of the abstract could be dropped prodi@science.unitn.it
696 Flavianet kaon Working Group Precision tests of the Standard Model with kl2 and kl3 We review the recent experimental and theoretical progress in the determination of |V_{us}|, and the status of the most stringent test of CKM unitarity. In addition, precision data on Kl3 and Kl2 decay rates and form factors allow us to perform significant tests of lepton universality and to constrain the strength of non-standard interactions. We discuss the present status of these tests and new-physics searches, as obtained by combining all the available results of the various kaon-physics experiments. Flavour Physics and CP Violation mario.antonelli@lnf.infn.it
697 Roger Firpo for the MAGIC Collaboration Status and results of the MAGIC telescope The MAGIC telescope is an imaging air Cherenkov telescope for very high energy gamma-ray astronomy. The scientific outcome of MAGIC at the end of its sencond cycle of observations includes outstanding results in both galactic and extragalactic physics. Among them the observation of periodic gamma-ray emission from the galactic binary system LSI+61, an unprecedented fast variability in the flux of the active galaxy Mrk 501 and the discovery of several new gamma-ray sources. The status and ongoing upgrades of the experiment, and a review of the main physics results are presented. Astroparticle Physics, Gravitational Waves and Cosmology rfirpo@ifae.es
698 Ricardo Goncalo on behalf of the ATLAS Trigger The ATLAS Trigger: High-Level Trigger Commissioning and Operation during Early Data Taking The ATLAS experiment is one of the two general-purpose experiments due to start operation soon at the Large Hadron Collider (LHC). The LHC will collide protons at a centre of mass energy of 14 TeV, with a bunch-crossing rate of 40 MHz. The ATLAS three-level trigger will reduce this input rate to match the foreseen offline storage capability of 100-200 Hz. After the Level 1 trigger, which is implemented in custom hardware, the High-Level Trigger (HLT) further reduces the rate from up to 100 kHz to the offline storage rate while retaining the most interesting physics. The HLT is implemented in software running in commercially available computer farms and consists of Level 2 and Event Filter. To reduce the network data traffic and the processing time to manageable levels, the HLT uses seeded, step-wise reconstruction, aiming at the earliest possible rejection. Data produced during LHC commissioning will be vital for calibrating and aligning sub-detectors, as well as for testing the ATLAS trigger and setting up the online event selection (or trigger menu). This will be done initially using zero-bias and minimum-bias collisions for system calibration and checks. As the LHC luminosity increases, the trigger menu will need to adapt so that the available output storage rate is used optimally to maximize the ATLAS physics potential. In preparation for LHC collision data, the functionality of the data-acquisition system and the HLT software was demonstrated using part of the readout chainto supply simulated events in raw-data format to a subset of the HLT farm. These tests included a complete set of physics triggers as well as configuration and monitoring. We give an overview of the ATLAS High Level Trigger focusing on the system design and its innovative features. We then present the ATLAS trigger strategy forthe initial phase of LHC exploitation, up to a luminosity of 10^31 s^-1 cm^-2 . Emphasis will be given to the full trigger menus, including physics and calibration triggers. Finally, we report on the valuable experience acquired through in-situ commissioning of the system where simulated events were used to exercise the trigger chain. In particular we show measurements of critical quantities such as event rates performed in a large-scale HLT farm using a complex trigger menu. Detectors and Data Handling Abstract resubmitted after merger of [311]+[313]+[595] into two abstracts r.goncalo@rhul.ac.uk
699 D. Roehrich for the BRAHMS collaboration Forward Physics with BRAHMS at RHIC The BRAHMS experiment at RHIC has measured pions, kaons and protons and their antiparticles over a wide range of rapidity and transverse momenta. Au+Au collisions, d+Au and p+p interactions have been studied. The hadro-chemistry at the fragmentation peak at forward rapidities will be compared to the one at mid-rapidity and to SPS data. The nuclear modification factor for d+Au collisions at 200 GeV changes from a Cronin-like enhancement of pions at midrapidity to an increasing suppression at forward rapidities. In central Au+Au collisions at 200 GeV a strong pion suppression is observed in R_AuAu at all rapidities, while protons are enhanced at the same time. High-Energy Nuclear Physics dieter.rohrich@ift.uib.no
700 Marco Zito for the T2K collaboration The T2K neutrino oscillation experiment The T2K experiment, starting in 2009, aims at a precise measurement of the neutrino oscillation parameters. Its main goal is to measure the theta_13 angle of the PMNS neutrino mixing matrix, the last unknown angle in this matrix. Precision measurements of the parameters Dm^2_32 and theta_23 will also be performed. The experiment is based on a 50 GeV, 0.75 MW proton beam produced in the JPARC accelerator complex at Tokai (Japan). This will be the first off-axis neutrino beam experiment, with a narrow neutrino spectrum peaking at E=600 MeV and reaching the Super-Kamiokande detector 300 km away. A magnetised and finely segmented detector at 280 m from the proton target will measure the neutrino flux and spectrum. The appearance of nu_e in Super-Kamiokande will provide the signature of nu_mu to nu_e oscillation and allow to extract theta_13. The T2K sensitivity to theta_13 is an order of magnitude better than past experiments. The status and progress in the construction of the beam line and the near detector will be presented. Neutrino Physics zito@dapnia.cea.fr
701 David Berge for the ATLAS First-Level Trigger Community The ATLAS Trigger: Overview and Status Report of the Level-1 Trigger including Cosmic-Ray Commissioning The ATLAS detector at CERN's Large Hadron Collider will be exposed to proton-proton collisions from beams crossing at 40 MHz. A three-level trigger system was designed to select potentially interesting events and reduce the incoming rate to 100-200 Hz. The first trigger level (LVL1) is implemented in custom-built electronics, the second and third trigger levels are realised in software. Based on calorimeter information and hits in dedicated muon-trigger detectors, the LVL1 decision is made by the central-trigger processor yielding an output rate of less than 100 kHz. The allowed latency for the trigger decision at this stage is less than 2.5 micro seconds. Installation of the final LVL1 trigger system at the ATLAS site is in full swing, to be completed later this year. We present an overview and a status report of the main components of the first-level trigger, including the trigger configuration system that was developed to supply and store trigger configuration data coherently across the whole trigger system. Integration tests of the central-trigger processor with the calorimeter and muon systems and the level-2 trigger have been successfully performed. Cosmic-ray data have been recorded in situ exercising the full trigger chain, using the central trigger to initiate the read-out of sub-detectors. These data are used for consistency checks of the full hardware and software chain. We show the analysis results and verify, where possible, that the LVL1 trigger meets the requirements and will be ready for data taking. Detectors and Data Handling As requested by Isabelle Wingerter-Seez, I resubmit one of the ATLAS trigger abstracts to obtain a final number. berge@cern.ch
702 Tommaso Boccali on Behalf of the CMS Collaboration CMS Offline and Computing preparation for data taking The LHC Collider in Geneva is expected to start colliding proton-proton beams at an energy of 14 TeV by the end of 2007. The CMS Collaboration is finalizing the construction not only of the apparatus, but also of the offline and computing infrastructure, in order to efficiently analyze the first collected data. Offline operations during the pilot run will include reconstruction at the T0, re-reconstruction with updated calibrations and alignment, sample skimming and analysis tasks. On the Computing side, this implies an efficient infrastructure able to deal with 300 Hz of DAQ output, and to move in an organized way the multi TB samples from T0 to the T2s, where analyzes will take place using GRID-like facilities. The Offline and Computing infrastructure has already been tested to a 25% scale during the challenge CSA06; a 50% challenge, CSA07, is going to happen during the summer. Detectors and Data Handling tommaso.boccali@cern.ch
703 M. E. Biagini, LNF-INFN SuperB project status and prospectives An international collaboration on the design of a Super B-Factory aiming at a 10^36 cm-2 s-1 luminosity is in progress. The design relies on a new collision scheme with large Piwinski’s angle and very small IP beam sizes, where possible harmful resonances will be cancelled by the newly proposed “crab waist” method. A Conceptual Design Report has been published in April this year. A review of the design principles and of the project status will be given. Accelerator RD and Technology marica.biagini@lnf.infn.it
704 A. Abada, S. Antusch, C. Biggio, F. Bonnet, M.B. Gavela, T. Hambye Low energy effects of neutrino masses While all models of Majorana neutrino masses lead to the same dimension five effective operator, the dimension six operators induced at low energies differ depending on the high energy model of new physics. We derive the low-energy dimension six operators for the three possible (tree-level) Seesaw models, in which the heavy fields can be either fermionic singlets, fermionic triplets or scalar triplets. The resulting operators may lead to effects observable in the near future, if the coefficients of the dimension five and six operators are decoupled along a certain pattern, which turns out to be common to all models. The phenomenological consequences are explored as well. Neutrino Physics Carla Biggio would be the person who would go and give the talk, if accepted. carla.biggio@uam.es
705 I. Braun, O. Bolz, C. van Eldik, G. Hermann, J. Hinton, and W. Hofmann for the H.E.S.S. Collaboration Localising the HESS Galactic Centre point source The detection of TeV gamma-rays from the direction of the Galactic Center is one of the most exciting discoveries in recent years. Observations by the H.E.S.S. system of imaging atmospheric Cherenkov telescopes provide the most precise available data on this source in the energy range 150 GeV - 30 TeV. The vicinity of the kinetic centre of our galaxy harbours numerous objects which could potentially accelerate particles to very high energies and thus produce the gamma-ray flux observed. The centre-of-gravity of the point-like emission measured by H.E.S.S. is in good agreement with the position of the supermassive black hole Sgr A* and the recently discovered PWN G359.95-0.04. Given a systematic pointing error of about 30'', a possible association with the SNR Sgr A East could not be ruled out with data available from 2004. In this contribution an update is given on the position of the H.E.S.S. Galactic Centre source using 2005/2006 data. The systematic pointing error is significantly reduced using guiding telescopes for pointing corrections, making it possible to exclude with high significance Sgr A East as the source of the TeV gamma-rays. Astroparticle Physics, Gravitational Waves and Cosmology isabel.braun@mpi-hd.mpg.de
706 Edwige Tournefier for the Virgo collaboration Virgo status and plans The first phase of commissioning of the Virgo interferometer allowed to reach a good stability of the interferometer and a sensitivity close enough to the design to start a first long science run. This run is in coincidence with the LIGO detectors, and joint data analysis will be done. The main steps of the Virgo commissioning will be presented as well as the performances during the science run. The plans for detector improvements will also be presented. Astroparticle Physics, Gravitational Waves and Cosmology tournefier@lapp.in2p3.fr
707 F.J. Botella, M. Nebot (speaker) Reparametrization Invariance, the controversial extraction of $\alpha$ from $B\to\pi\pi$ and New Physics The extraction of the weak phase $\alpha$ from $B\to\pi\pi$ decays has been controversial from a statistical point of view, as illustrated by the frequentist vs. bayesian confrontation. Analyses of several relevant questions which were not deserving full attention and pervade the extraction of $\alpha$ are presented. Reparametrization Invariance proves appropriate to understand those issues. It is shown how some Standard Model inspired parametrizations can be senseless or inadequate if they go beyond the minimal Gronau & London assumptions: the single weak phase $\alpha$ just in the $\Delta I=3/2$ amplitudes, the isospin relations and experimental data. Beside those analyses, we extract $\alpha$ through the use of several adequate parametrizations, showing that there is no relevant discrepancy between frequentist and bayesian results. The most relevant information, in terms of $\alpha$, is the exclusion of values around $\alpha\sim\pi/4$; this result is valid in the presence of arbitrary New Physics contributions to the $\Delta I=1/2$ piece. Flavour Physics and CP Violation nebot@cftp.ist.utl.pt
708 OPAL Collaboration Bose-Einstein study of position-momentum correlations of charged pions in hadronic Z0 decays A study of Bose-Einstein correlations in pairs of identically charged pions produced in e+e- annihilations at the Z0 peak has been performed for the first time assuming a non-static emitting source. The results are based on the high statistics data obtained with the OPAL detector at LEP. The correlation functions have been analyzed in intervals of the average pair transverse momentum and of the pair rapidity, in order to study possible correlations between the pion production points and their momenta (position-momentum correlations). The Yano-Koonin and the Bertsch-Pratt parameterizations have been fitted to the measured correlation functions to estimate the geometrical parameters of the source as well as the velocity of the source elements with respect to the overall centre-of-mass frame. The source rapidity is found to scale approximately with the pair rapidity, and both the longitudinal and transverse source dimensions are found to decrease for increasing average pair transverse momenta. Strong Interactions opal-physics-coordinators@cern.ch
709 Jim Hinton for the H.E.S.S. Collaboration Very High Energy Gamma-ray Astronomy with H.E.S.S. Currently one of the most active areas in astroparticle physics, very high energy astronomy is proving itself to be an effective probe of ultrarelativistic particles in our galaxy and beyond. The High Energy Stereoscopic System (H.E.S.S.) is currently the most sensitive instrument for TeV gamma-ray studies. I will present recent results from H.E.S.S., and discuss the implications of these results for both astrophysics and particle physics. Astroparticle Physics, Gravitational Waves and Cosmology jah@ast.leeds.ac.uk
710 Pasquale Di Nezza Nuclear Attenuation & pT broadening in DIS at HERMES The HERMES experiment at Desy uses a 27.6 GeV lepton beam on a fixed gaseous target. By studying semi-inclusive deep inelastic scattering on nuclear targets the space-time evolution of hadronization can be studied. This process is ideal because of the absence of initial state interactions and, in the HERMES kinematics, hadronization most likely takes place inside the nucleus. A multidimensional analysis of the nuclear attenuation and the first results of the pT-broadening for different hadron types is presented. These results show also high potentialities for the interpretation of the heavy ion interactions up to medium centralities. High-Energy Nuclear Physics Pasquale.DiNezza@lnf.infn.it
711 Giovanni Losurdo The plans for next generations interferometric gravitational waves detectors The interferometric detectors of gravitational waves of first generation are now taking data. A first detection might be possible with these instruments, but more sensitive detectors will be needed to start the gravitational wave astronomy. The interferometers of second generation will improve the sensitivity by a factor ten, allowing to explore a universe volume a thousand times larger. The technology is almost ready and they will be built at the beginning of next decade. The community of the physicists involved in the field has also started to make plans for third generation detectors, for which a long term technology development will be required. The plans for the upgrades of the existing detectors and the possible scenarios for the evolution of the field will be reviewed in the talk. Astroparticle Physics, Gravitational Waves and Cosmology losurdo@fi.infn.it
712 The MICE collaboration MICE: the international Muon Ionisation Cooling Experiment Muon storage rings have been proposed for use as a source of high-energy neutrino beams (the Neutrino Factory) and as the basis for a high-energy lepton-anti-lepton collider (the Muon Collider). The Neutrino Factory is widely believed to be the machine of choice for the search for leptonic-CP violation while the Muon Collider may prove to be the most practical route to multi-TeV lepton-anti-lepton collisions. The baseline conceptual designs for each of these facilities requires the phase-space compression (cooling) of the muon beams prior to acceleration. The short muon-lifetime makes it impossible to employ traditional techniques to cool the beam while maintaining the muon-beam intensity. Ionisation cooling, a process in which the muon beam is passed through a series of liquid hydrogen absorbers followed by accelerating RF-cavities, is the technique proposed to cool the muon beam. The international Muon Ionisation Cooling Experiment (MICE) collaboration will carry out a systematic study of ionisation cooling. The MICE experiment, which is under construction at the Rutherford Appleton Laboratory, will begin to take data late this year. The MICE cooling channel, the instrumentation and the implementation at the Rutherford Appleton Laboratory is described together with the predicted performance of the channel and the measurements that will be made. Accelerator RD and Technology Submitted on behalf of the MICE collaboration K.Long@Imperial.AC.UK
713 Sridhara Dasu CMS Online Event Selection The CMS experiment online event selection is carried out in two distinct stages. At level-1 the trigger electronics reduces the 40 MHz collision rate to provide up to 100 kHz of interesting events, based on objects found using its calorimeter and muon subsystems. The High Level Trigger (HLT) that runs in the 1000 dual-CPU box Filter Farm of the CMS experiment is a set of sophisticated software tools that run in a real-time environmentto make a further selection and archive few hundred Hz of interesting events. The level-1 electronics systems have many tunable parameters and look-up-tables, whose configuration we have optimized for early data taking. The coherent tuning of the HLT algorithms to accommodate multiple physics channels is a key issue for CMS, one that literally defines the reach of the experiment's physics program. In this presentation we will discuss the strategies and trigger configuration developed for startup physics program of the CMS experiment. We will also discuss the CPU performance of the HLT algorithms. Detectors and Data Handling Late abstract submitted on consultation with Dr. Dave Newbold dasu@hep.wisc.edu
714 N. Irges, F. Knechtli and M. Luz Higgs mechanism in five-dimensional gauge theories Lattice simulations of five-dimensional gauge theories on a orbifold revealed that there is spontaneous symmetry breaking. Some of the extra-dimensional components of the gauge field play the role of a Higgs field and some of the four-dimensional components become massive gauge bosons. The effect is confirmed by computing the Coleman-Weinberg potential with a cut-off. We compare the results of this computation with the lattice data. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry speaker: F. Knechtli knechtli@physik.uni-wuppertal.de
715 T. Matsushita for the MICE Collaboration The MICE scintillating-fibre tracker The international Muon Ionization Cooling Experiment (MICE) collaboration will carry out a systematic investigation of the ionization cooling of a muon beam. An ionization cooling channel is required to compress the phase-space volume occupied by the muon beam prior to acceleration in the baseline conceptual designs for both the Neutrino Factory and the Muon Collider. Muons entering and leaving the cooling channel will be measured in two solenoidal spectrometers, each of which is instrumented with a scintillating-fibre tracker. Each tracker is composed of five planar scintillating fibre stations, each station being composed of three planar layers of 350 μ scintillating fibres. The devices will be readout using the Visible Light Photon Counters (VLPCs) developed for use in the D0 experiment at the Tevatron. The design of the system will be presented along with the status of the tracker-construction project. The expected performance of prototypes of the full trackers will be summarised. Detectors and Data Handling Detectors and Data Handling or Accelerator R&D and technology t.matsushita@imperial.ac.uk
716 G. Duplancic, A.Khodjamirian , Th.Mannel, B.Melic, N. Offen $|V_{ub}|$ determination using $B \to \pi$ form factors from light-cone sum rules We present a new determination of $|V_{ub}|$ from exclusive semileptonic $B\to \pi l \nu_l$ decays, employing the $B\to\pi$ form factors obtained from the QCD light-cone sum rules. The $O(\alpha_s)$ radiative corrections to the twist-2 and twist-3 terms are recalculated using the $\overline{MS}$ mass of the $b$ quark. The updated parameters of the twist 3,4 distribution amplitudes of the pion are used. A special attention is paid to the estimate of the theoretical uncertainties. Flavour Physics and CP Violation to be presented by Alexander Khodjamirian (Uni. Siegen, Germany) khodjam@hep.physik.uni-siegen.de
717 G. Duplancic, A.Khodjamirian , Th.Mannel, B.Melic, N. Offen $|V_{ub}|$ determination using $B \to \pi$ form factors from light-cone sum rules We present a new determination of $|V_{ub}|$ from exclusive semileptonic $B\to \pi l \nu_l$ decays, employing the $B\to\pi$ form factors obtained from the QCD light-cone sum rules. The $O(\alpha_s)$ radiative corrections to the twist-2 and twist-3 terms are recalculated using the $\overline{MS}$ mass of the $b$ quark. The updated parameters of the twist 3,4 distribution amplitudes of the pion are used. A special attention is paid to the estimate of the theoretical uncertainties. Flavour Physics and CP Violation to be presented by Alexander Khodjamirian (Uni. Siegen, Germany) khodjam@hep.physik.uni-siegen.de
718 Jan Kalinowski Neutralinos of the U(1)-extended MSSM: from colliders to cosmology We analyze the supersymmetric U(1)--extended model (USSM) that includes an Abelian gauge superfield and a Higgs singlet superfield in addition to the standard gauge and Higgs superfields of the MSSM. Compared to the MSSM, the model contains two extra neutralino states, a new scalar Higgs as well as a new gauge boson. As a results, the phenomenology of the neutralino sector, in particular, is significantly altered which may have important consequences for dark matter searches. Here we consider a particular scenario and analyze a complementarity of informations extracted from the neutralino pair production at $e^+e^-$ colliders, direct dark matter search experiments and measurements of relic abundance of dark matter. Physics Beyond the Standard Model kalino@fuw.edu.pl
719 Sam Waldman Attometer Astrophysics: LIGO status in 2007 The Laser Interferometer Gravitational Wave Observatory (LIGO) is nearing the end of two-years of continuous science operation. LIGO consists of three long-baseline interferometers, two located in Washington state and one in Louisiana, sensitive to gravitational waves emitted from merging compact binary sources, spinning pulsars, supernovae, and even cosmological sources. Intermittent commissioning activities through the run have improved the noise such that the detectors have exceeded the design goal, achieving 0.1 attometer / rHz at 100 Hz sensitivity. Ongoing upgrades will further improve the sensitivity in preparation for a second extended science run before Advanced LIGO installation begins. Astroparticle Physics, Gravitational Waves and Cosmology waldman_s@ligo.caltech.edu
720 Zomorrodian, M.E Standard model coupling constant The idea that all particle interactions emerge into a unified theory at very high energies is so attractive , for both aesthetical and phenomenological reasons, that this concept has been widely accepted by now. Indeed , the quantitative success of coupling unification in SUSY Grand Unified Theories ( GUTs) can be hardly interpreted as just a coincidence. In addition, support has come from developments on neutrino oscillations, which point to lepton number violation at a scale close to the coupling unification one. In this paper , we use the experimentally derived coupling constant by using the electron positron data, and compare the results in different experiments. The procedure for determining s is the same as used by other experiments at different centre of mass energies. The observed energy dependence of s is found to be in good agreement with the QCD prediction, and is clearly incompatible with a constant value. Possible explanation for all these features will be explained in this paper. Strong Interactions zomorrod@ferdowsi.um.ac.ir
721 Zomorrodian, M.E, B. Yagmaee Measurement of strong coupling constant in electron positron annihilations In this paper , we measure the coupling constant by two different methods. In the first method, we separate two and three jet events by diagonalizing the 3 x 3 momentum tensor. At lowest in perturbative QCD, the ratio of 3 jet to two jet events is simply the probability for gluon emission or the strong coupling parameter. The value of the strong coupling constant in this method depends on the sphericity cuts which separates two and three jet events. However in most cases , the results obtained are in quantitative agreement with the QCD theory. The more systematic determination of the coupling constant is determined by using the jet clustering algorithm introduced by the JADE group. The value of the coupling parameter obtained by this method and by Altarelli-Parisi-Weizsacker-Williams technique is also consistent with the QCD theory as well as with the values obtained by different experiments. Strong Interactions zomorrod@ferdowsi.um.ac.ir
722 B. Autin, J. Collot, J. Fourrier, E. Froidefond, F. Lemuet, F. Méot, J. Pasternak : LPSC ; D. Neuvéglise, Th. Planche : SIGMAPHI ; J. Balosso : Grenoble Hospital ; P. Pommier : Lyon Hospital RACCAM : Research in ACCeleration and Applications to Medicine RACCAM (Research in ACCeleration and Applications to Medicine) is a project of the Laboratory for Subatomic Physics and Cosmology of Grenoble aiming at the generic study of Fixed Field Alternating Gradient accelerators (FFAG) and their potential applications to protontherapy. RACCAM is mostly funded by ANR, the French Agency for National Research. It involves several public research operators : CNRS/MPPU-IN2P3, CEA and the Joseph Fourier University of Grenoble ; two hospitals as well as a magnet company : SIGMAPHI. Following the recent construction of several prototypes in Japan, FFAG accelerators, which had been abandonned in the 1950's due to technological limitations, have regained attention in the high energy community because of their high momentum acceptance, which make them good candidates for muon acceleration, their fast cycling rates, their potential energy variability and their multiport extraction capability which are desired features of an ideal medical proton accelerator presently difficult to obtain at the same time in existing synchrotrons or cyclotrons. Beyond contributing at the international level to the general study of particle acceleration through FFAG's, RACCAM has put forward the design of a scaling spiral FFAG which has the capability to accelerate protons from 17 MeV up to 180 MeV. The features of this machine are such that they would fit the upgrade of CAL (Centre André Lacassagne) in Nice which is one of the two operating protontherapy centers in France. One of the difficulties of building such a machine is the design and the production of the 8 spiral magnets which have an unusual shape and need a complex current supply distribution. In close collaboration with SIGMAPHI a crash effort is being made to design one of these magnets in detail and launch the construction of a prototype this year. Recent contacts have been established with IBA and MEDICYC-AIMA in view of extending the participation and the objective of the project. Accelerator RD and Technology speaker : Johann Collot (LPSC) Project leader : Francois Méot (LPSC/CEA) collot@in2p3.fr
723 Naseri,mosayeb Electromagnetic Casimir effect in Krein space The present work is part of an investigation of the new version of the canonical quantization called Gupta-Bleuler quantization or Krein space quantization [J.P. Gazeau, J. Renaud, M.V. Takook, Class. Quantum. Grav. 17 (2000) 1415, gr-qc/9904023; M.V. Takook, Int. J. Mod. Phys. E 11 (2002) 509, gr-qc/0006019].In this paper, we reexamine this method in calculation of electromagnetic casimir force in four dimensional spacetime. As we know within the canonical quantization there are infinite terms which appear in the energy-momentum tensor and its expectation values for some field states, especially in the vacuum. Krein space quantization rests on the canonical commutation relations (ccr) and on the definition of the vacuum ak|0i = 0,which introduces a new version of quantization verifying the ccr but with a different vacuum. In this method, the Fock space is built over a so-called Krein space,where the negative frequency solutions of the field equation are needed for quantization in a correct way. This auxiliary negative norm states do not interact with the physical states or real physical world. Naturally these modes cannot be affected by the physical boundary conditions. It can be seen that the presence of these negative norm states play the role of an automatic renormalization device for the theory. This method has already been successfully applied to the massless minimally coupled scalar field in de Sitter space-time for which it preserves covariance. In this process, ultraviolet and infrared divergences have been automatically eliminated. Also by using of this method the 4 theory in Minkowski space-time in one-loop approximation is automatically renormalized and a non-divergent one-loop approximation of the interaction of gravity with a scalar field can be achived [Mohammad Vahid Takook,Int.J.Mod.Phys. E14 (2005) 219-224].An interesting feature of the theory is that, although the field is obtained by canonical quantization, it is independent of Bogoliubov transformations. Moreover no infinite term appears in the computation of Tμ mean values and the vacuum energy of the free field vanishes: h0|T00|0i = 0. In previous work an explicit calculation of Casimir effect in two dimensional space-time through Krein space quantization has presented [H. Khosravi , M. Naseri , S. Rouhani , M.V. Takook ,Physics Letters B 640 (2006) 48-51]. Here we investigate the behaviour of the Krein space quantization for a electromagnetic casimir force calculation. Casimir force in four dimensional Minkowski spacetime, has been calculated through the Krein space quantization. Once again it is found that the theory is automatically renormalized. Astroparticle Physics, Gravitational Waves and Cosmology sepehr1976@yahoo.com
724 J.M.Zanotti (UKQCD and RBC Collaborations) K->pi form factor with 2+1 dynamical domain wall fermions We present the latest results from the UKQCD/RBC collaborations for the K_l3 form factor with 2+1 flavours of dynamical domain wall quarks. Simulations are performed on 16^3x32x16 and 24^3x64x16 lattices with four values of the light quark mass, allowing for an extrapolation to the chiral limit. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry jzanotti@ph.ed.ac.uk
727 Kwei-Chou Yang Light-Cone Distribution Amplitudes of $1^3P_1$ and $1^1P_1$ Axial-vector Mesons in QCD We present a detailed study of twist-2 and twist-3 light-cone distribution amplitudes of axial-vector mesons, based on QCD conformal partial wave expansion. The relevant G-parity invariant and violating parameters for the conformal partial waves of distribution amplitudes, containing the corrections due to the SU(3) breaking effects, are evaluated from the QCD sum rule method. The results for axial-vector decay constants of $1^3P_1$ states and for the tensor decay constants of $1^1P_1$ states are calculated. Using Gell-Mann-Okubo mass formula, the mixing angle for the $f_8$ and $f_1$ of $1^3P_1$ states is $\theta_{^3P_1}\sim 38^\circ$, and that for $h_8$ and $h_1$ of $1^1P_1$ states is $\theta_{^1P_1}\sim 10^\circ$. The detailed properties for physical states $f_1(1285), f_1(1420), h_1(1170)$, and $h_1(1380)$ are given. Assuming the mixing angle between $K_{1A}$ and $K_{1B}$ to be $\theta_K=45^\circ$ or $-45^\circ$, we also give the detailed study for $K_1(1270)$ and $K_1(1400)$. Using the conformal partial wave expansion, we obtain the models for distribution amplitudes, containing contributions up to conformal spin 9/2. Refs.: 1. K. C. Yang, "Light-cone distribution amplitudes for the light 1(1)P(1) mesons," JHEP {\bf 0510}, 108 (2005) [arXiv:hep-ph/0509337]. 2. K.C. Yang, "Light-Cone Distribution Amplitudes of Axial-vector Mesons", arXix:0705.0692, to appear in Nucl. Phys. B. 3. K. C. Yang, "Annihilation in factorization-suppressed B decays involving a 1(1)P(1) meson and search for new-physics signals," Phys. Rev. D72, 034009 (2005) [arXiv:hep-ph/0506040]. High-Energy Nuclear Physics kcyang@cycu.edu.tw
728 L. Del Debbio, H. Panagopoulos, E. Vicari SU(N) gauge theories in the presence of a topological term We present recent results on the theta dependence of the ground-state energy and spectrum of four-dimensional SU(N) gauge theories, where theta is the coefficient of the CP-violating topological term F-Fdual in the Lagrangian. In particular, we discuss the results obtained by Monte Carlo simulations of the lattice formulation of QCD, which allow us to investigate the theta dependence around theta=0 by determining the moments of the topological charge distribution, and their correlations with other observables. The results support the scenario obtained by general large-N scaling arguments, which indicate theta/N as the relevant Lagrangian parameter in the large-N expansion. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry haris@ucy.ac.cy
729 Mikhail Rogal Calculation of Charged Current DIS at three loops In this presentation I would like to discuss technical and computational problems on the derivation of the perturbative QCD corrections to three loops for the charged current structure functions F_2, F_L and F_3 for deep-inelastic neutrino-proton scattering in the combination "nu P - nubar P". In leading twist approximation we calculate the first five odd-integer Mellin moments in the case of F_2 and F_L and the first five even-integer moments in the case of F_3 . As a new result we obtain the coefficient functions to O(alpha_s^3) while the corresponding anomalous dimensions agree with known results in the literature. Strong Interactions Mikhail.Rogal@desy.de
730 Denis Dujmic, Steve Ahlen, Peter Fisher, Asher Kaboth, Jocelyn Monroe, Gabriella Sciolla, Hidefumi Tomita, Roland Vanderspek, Hermann Wellenstein Head-tail of dark matter flux using TPC with optical readout We present a method to determine the head-tail of the dark matter flux by observing the direction of elastic recoils with the detector gas. As a demonstration, we place a time-projection chamber with low-pressure CF4 gas in a neutron beam and record scintillation light created by recoiling gas nuclei. We observe variation of the light intensity along the track due to decreasing ionization rate, which allows us to determine the direction of the incoming neutrons. This study is a part of effort to detect the dark matter by observing forward-backward asymmetry along expected direction of the dark matter flux. Astroparticle Physics, Gravitational Waves and Cosmology also submitted to "Detectors" session ddujmic@mit.edu
731 Denis Dujmic, Steve Ahlen, Peter Fisher, Asher Kaboth, Jocelyn Monroe, Gabriella Sciolla, Hidefumi Tomita, Roland Vanderspek, Hermann Wellenstein Head-tail of dark matter flux using TPC with optical readout We present a method to determine the head-tail of the dark matter flux by observing the direction of elastic recoils with the detector gas. As a demonstration, we place a time-projection chamber with low-pressure CF4 gas in a neutron beam and record scintillation light created by recoiling gas nuclei. We observe variation of the light intensity along the track due to decreasing ionization rate, which allows us to determine the direction of the incoming neutrons. This study is a part of effort to detect the dark matter by observing forward-backward asymmetry along expected direction of the dark matter flux. Detectors and Data Handling also submitted to "Astroparticle" session ddujmic@mit.edu
732 I. Scimemi The top-quark jet-mass at 2 loops Recently a new deifinition of the top-quark mass has been proposed Fleming-Hoang-Mantry-Stewart. I will discuss this new definition of the mass and its properties at 2-loops using effective field theory. High-Energy Electroweak Physics scimemi@mit.edu
733 Oliver Bruning LHC Challenges and Upgrade Options The presentation summarizes the key parameters of the LHC collider. Following a discussion of the main challenges for reaching the nominal machine performance the presentation identifies options for increasing the operation tolerances and the potential performance reach of the LHC by means of future hardware upgrades of the LHC and it's injector complex. Accelerator RD and Technology oliver.bruning@cern.ch
734 Patrick Sutton, for the LIGO Scientific Collaboration Searches for Gravitational Waves with LIGO The Laser Interferometer Gravitational-wave Observatory (LIGO) detectors have reached their design sensitivity, and searches for gravitational waves are ongoing. We highlight current attempts to detect various classes of target signals. These include unmodeled sub-second bursts of gravitational radiation, such as from core-collapse supernovae and gamma-ray burst engines. Gravitational waves from isolated neutron stars and from the inspiral/merger of compact binary systems carry significant information about the bulk properties of of black holes and neutron stars. A stochastic background of gravitational waves of cosmological origin would provide a unique view of conditions in the very early universe. We discuss current attempts to detect gravitational waves from these sources and comment on future prospects for these searches. Astroparticle Physics, Gravitational Waves and Cosmology psutton@ligo.caltech.edu
735 Aaron S. Chou (for the GammeV collaboration) Search for milli-eV mass particles using laser techniques We describe the GammeV experiment at Fermilab--a search for oscillations of photons into new milli-eV mass particles via an axion-like two-photon coupling. A high-power laser is sent into a Fermilab Tevatron magnet that is blocked by a mirrored surface in its interior (the "wall"). If some photons convert into a new milli-eV particles via interactions with the magnetic field, they may pass through the mirror and some fraction may reconvert into detectable photons on the other side. The mirrored surface is attached to a moveable plunger which allows us to adjust the effective baseline of the oscillation and hence probe for particles of slightly different mass. In a second phase, we search for dilaton-like chameleon particles using a novel "particles trapped in a jar" technique. We describe the design, status, and preliminary results of this experiment. Physics Beyond the Standard Model achou@fnal.gov
736 Mike Cruise for LISA LISA: A new gravitational wave window on the Universe. The LISA mission is now in planning for a launch in 2018 as a joint ESA –NASA mission. It will measure low frequency gravitational waves from a variety of sources including white dwarfs, black holes and possible a stochastic cosmological background. LISA will be preceded by LISA Pathfinder, an ESA mission designed to test the technology needed to achieve the performance goals of LISA. With the ability to study strong field gravity out to Z~10, the mission should provide new insights into gravitational physics as well as astrophysics and cosmology. Astroparticle Physics, Gravitational Waves and Cosmology a.m.cruise@bham.ac.uk
737 Karel Smolek, Masato Arai, Nobuchika Okada, Vladislav Simak Influence of graviton on top-antitop production at the LHC We examine the influence of graviton on the top quark production in the brane world scenario. We study it in two typical models of the scenario - the models proposed by Arkani-Hamed, Dimopoulos and Dvali (ADD) and Randall and Sundrum (RS). With a resonable parameter choice, we find a sizable deviation of the top-antitop pair production cross sections and the top spin correlation from those in the Standard Model. Physics Beyond the Standard Model karel.smolek@utef.cvut.cz
738 Damir Becirevic, Svjetlana Fajfer, Jernej Kamenik Chiral behavior of the heavy meson mixing amplitudes in the standard model and beyond We have computed the chiral logarithmic corrections to the heavy meson mixing amplitudes in the Standard Model and beyond. The impact of the inclusion of lowest-lying scalar heavy-light states to the decay constants and bag-parameters has been investigated and shown that this does not modify the pion chiral logarithms, but it does produce corrections which are competitive in size with the K- and eta-meson chiral logarithms. The result is highly relevant for the precise determination of the heavy meson bag-parameters from lattice studies since the pion chiral logarithms represent the most important effect in guiding the chiral extrapolations of the lattice data for these quantities. Flavour Physics and CP Violation jernej.kamenik@ijs.si
739 Simon JM Peeters, on behalf of the SNO collaboration News from the Sudbury Neutrino Observatory The Sudbury Neutrino Observatory (SNO) has now completed neutrino detection with 1,000 tonnes of heavy water situated 2,000 meters underground in INCO's Creighton Mine near Sudbury, Ontario. During the first two phases of the experiment, SNO showed that neutrinos change flavour on their way to earth and accurately measured the solar neutrino oscillation parameters. Besides this, SNO was also able to use the data of these first two phases for other analyses. In particular, it recently set a limit on the Solar hep Reaction and the diffuse Supernova background. The third and final phase of operation uses an array of neutron detectors to independently observe the Neutral Current reaction of solar neutrinos on deuterium. Data analysis of this phase is in progress. In this talk, I will discuss the latest results of the first two phases of the SNO experiment and report on the operation and calibration SNO detector during the it's final phase. Neutrino Physics Apologies for the late submission. I have been in corrospondence with Nakaya-san about this, so he is aware it was coming. s.peeters@lancaster.ac.uk
740 Vladimir Pastushenko. Elementary particles, Quantum Theory of the Relativity and Superquasar The resume Real, dynamical a space - matter as a single whole, within the framework of the dynamical axioms - facts, corresponds to physical properties of space - time in frameworks of Euclid’s axiomatic as a special case which lays in the basis of all modern physical theories. After creation of the Special Theory of the Relativity, the theory of gravitation in the General Theory of the Relativity has been created. After creation of the Quantum Theory of the Relativity, the theory of Quantum Gravitation has been created. The special case of Quantum Gravitation is the General Theory of the Relativity and the theory of Electro-strong Interaction. The special case of the theory of Electro-strong Interaction is equations of Maxwell. Works are represented on http://ic.km.ua/~pva . Strong Interactions http://ic.km.ua/~pva pva@sk.km.ua
741 Pavel Cermak Experiment TGV II - results on double electron capture in 106Cd The TGV II (Telescope Germanium Vertical) facility is a low background spectrometer operated in Modane Underground Laboratory. It aims at the study of double electron capture of Cd-106. The spectrometer is composed of 32 HPGe planar detectors interleaved with thin-foil samples made of Cd-106 enriched to 75%. In 2006, the main run of phase I (1 year duration) was terminated yielding a new limit on half-life for two-neutrino double electron capture in Cd-106 as 2.0 x 10^{20} y. The new limit is significantly higher (by almost three orders of magnitude) than those already published. Neutrino Physics pavel.cermak@utef.cvut.cz
742 Paolo Giordano (based on a collaboration with P. Gambino, G. Ossola, N. Uraltsev) Semileptonic B decays and the inclusive determination of Vub We study inclusive semileptonic decays without charm in the kinetic scheme, including perturbative corrections through $O(\alpha_s^2 \beta_0)$ and all the available non-perturbative corrections. We parameterize the light-cone distribution function in terms of its moments. Our analysis differs in several ways from the existing ones. We extract |Vub| from the latest experimental data with various cuts and estimate the theoretical uncertainties in each case. Flavour Physics and CP Violation pgiordan@to.infn.it
743 Marco Apollonio, John Cobb Emittance measurement in MICE Muon cooling will be an essential element of a future neutrino factory. The Muon Ionization Cooling Experiment, MICE, to be built at RAL (UK), will be the first apparatus to demonstrate the feasibility of the ionisation cooling of muons. MICE will be unique in being able to make single-particle measurements and it will be possible to measure the amplitude of each muon in 6D phase space. We show how amplitude measurements can be used to quantify the transmission of the cooling channel and the increase in central phase space density due to cooling. Accelerator RD and Technology m.apollonio@physics.ox.ac.uk
744 F. Darabi Signature change, vacuum condensation and cosmological constant We proposes a model of duality symmetry, including an scalar field, an internal vector and a metric signature. At some small scale an effective scalar field equation is appeared whose potential acts like a Higgs one, where the metric signature plays the role of an order parameter. Non-vanishing Vacuum condensation of this Higgs field occurs once a signature change from Euclidean to Lorentzian is formed. The mass scale of Higgs field excitations around this vacuum may contribute to the cosmological constant, in agreement with observations. Astroparticle Physics, Gravitational Waves and Cosmology f.darabi@azaruniv.edu
745 C. Bogdanos, S. Nesseris, L. Perivolaropoulos, K. Tamvakis Cosmic Acceleration Data and Bulk-Brane Energy Exchange We consider a braneworld model with bulk-brane energy exchange. This allows for crossing of the w=-1 phantom divide line without introducing phantom energy with quantum instabilities. We use the latest SnIa data included in the Gold06 dataset to provide an estimate of the preferred parameter values of this braneworld model. We use three fitting approaches which provide best fit parameter values and hint towards a bulk energy component that behaves like relativistic matter which is propagating in the bulk and is moving at a speed v along the fifth dimension, while the bulk-brane energy exchange component corresponds to negative pressure and signifies energy flowing from the bulk into the brane. We find that the best fit effective equation of state parameter $w_{eff}$ marginally crosses the phantom divide line w=-1. Thus, we have demonstrated both the ability of this class of braneworld models to provide crossing of the phantom divide and also that cosmological data hint towards natural values for the model parameters. Astroparticle Physics, Gravitational Waves and Cosmology bogdanos@grads.uoi.gr
746 OGAWA Izumi Study of 48Ca double beta decay with CANDLES CANDLES is the project to search for double beta decay of 48Ca by using CaF2 scintillators. Study of double beta decay becomes of particular importance after confirmation of neutrino oscillation which shows that neutrinos have mass. The absolute scale of neutrino mass and the characterization of neutrino (Majorana or Dirac particle) are still unknown. In most grand unified theories, neutrinos are predicted to be massive Majorana particles. If neutrinos have Majorana mass they violate lepton number conservation and neutrino-less double beta decay (0nuDBD) can then take place. Therefore the study of the 0nuDBD is one of the most fundamental research to be carried out in a coming decade. We have been studying the DBD of 48Ca. The Q-value of 48Ca is the highest (4.27 MeV) among potential DBD nuclei. The Q-value is far above energies of gamma-rays from natural radioactivities (maximum 2.615 MeV from 208Tl decay), therefore we can naturally expect small backgrounds in the energy region we are interested in. Required performances for the detector system to study DBD are radio-purity, good background rejection efficiency and good energy resolution. We are now constructing CANDLES III detector in our laboratory at sea level, which consists of 40 PMTs and 60 CaF2 crystals with the total mass of 191kg. We will report the basic performances of the system, including the light collection, position reconstruction and background rejection studied with CANDLES III. Neutrino Physics ogawa@phys.sci.osaka-u.ac.jp
747 M. S. Zisman, for the ISS Accelerator Working Group Neutrino Factory International Scoping Study During the past several years, an International Scoping Study (ISS) of a Neutrino Factory was carried out, with the aim of developing an internationally accepted baseline facility design. Progress toward that goal will be described. Many of the key technical aspects of a Neutrino Factory facility design are presently being investigated experimentally, and the status of these investigations will be indicated. Target aspects are being examined in the MERIT experiment at CERN, muon ionization cooling is being studied in the MICE experiment at RAL, and novel aspects of acceleration with so-called non-scaling Fixed Field, Alternating Gradient (FFAG) rings will be explored in the EMMA experiment at Daresbury Laboratory. Finally, plans for the recently launched International Design Study (IDS), which serves as a follow-on to the ISS will be briefly described. Accelerator RD and Technology mszisman@lbl.gov
748 C. Pallis F-term hybrid inflation followed by modular inflation We consider two-stage inflationary models in which a superheavy scale F-term hybrid inflation is followed by an intermediate scale modular inflation. We confront these models with the restrictions on the power spectrum of density perturbations $P_{\cal R}$ and the spectral index $n_{\rm s}$ from the recent data within the power-law cosmological model with cold dark matter and a cosmological constant. We show that these restrictions can be met provided that the number of e-foldings $N_{\rm HI*}$ of the pivot scale $k_*=0.002/{\rm Mpc}$ during hybrid inflation is appropriately restricted. The additional e-foldings required for solving the horizon and flatness problems can be naturally generated by the subsequent modular inflation of slow roll type realized by a string axion. Astroparticle Physics, Gravitational Waves and Cosmology The relevant paper (hep-ph/0702260) has been recently accepted for publication in Phys. Let. B kpallis@auth.gr
749 A.Monin, A.Zayakin Induced Schwinger Processes Induced Schwinger processes are a natural extension of spontaneous pair production phenomena in external fields. In the present study we work out semiclassically the rate of a specific induced decay process, namely, the non-perturbative decay of a 't Hooft--Polyakov monopole into a dyon and a charged fermion. The sub-leading semiclassical pre-exponential factor is presented. The leading exponential factor is shown to be in full agreement with the previous results derived in a different technique. Analogous treatment is shown to hold for the two-fermionic decay of the lightest bound state in Thirring model. Thus restoring the ``effective meson--fermion vertex'' becomes possible. General features of finite-temperature theories are reviewed. Finite-temperature corrections are calculated to the process of the Thirring meson decay in the high- and low-temperature limits. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry zayakin@itep.ru
750 E. Fernandez-Martinez, M.B. Gavela, J.Lopez-Pavon, O. Yasuda CP-violation from non-unitary leptonic mixing A low-energy non-unitary leptonic mixing matrix is a generic effect of a large class of theories accounting for neutrino masses. It is shown how the extra CP-odd phases of a general non-unitary matrix allow for sizeable CP-asymmetries in channels other than those dominant in the standard unitary case. The $\nu_\mu\to \nu_\tau$ channel turns out to be an excellent tool to further constrain moduli and phases. Furthermore, we clarify the relationship between our approach and the so-called "non-standard neutrino interactions" schemes: the sensitivities explored here apply as well to such constructions. Neutrino Physics jacobo.lopez@uam.es
751 Farrin Payandeh , Mohammad Vahid Takook One-loop approximation of Moller scattering in Krein space quantization It has been shown that the negative-norm states necessarily appear in a covariant quantization of the free minimally coupled scalar field in de Sitter spacetime. In this process ultraviolet and infrared divergences have been automatically eliminated. It has been shown that the combination of quantum field theory in Krein space together with consideration of quantum metric fluctuation, results in QFT without any divergences. Pursuing this approach we have calculated the Moller scattering in the one-loop approximation in generalized Krein space. The mathematical consequences of this method is the disappearance of the ultraviolet divergence in the one-loop approximation. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry payandeh@aut.ac.ir
752 DELPHI collaboration Search for one large extra dimension with the DELPHI detector at LEP Single photons detected by the DELPHI experiment at LEP2 in the years 1997-2000 are used to investigate the existence of a single extra dimension in a modified ADD scenario with slightly warped large extra dimensions. The data collected at centre-of-mass energies between 180 and 209 GeV for an integrated luminosity of $\sim$ 650 $\mathrm {pb^{-1}}$ agree with the predictions of the Standard Model and allow to set a limit on graviton emission in one large extra dimension. The limit obtained on the fundamental mass scale $M_D$ is 1.69 TeV at 95$\%$ CL, with an expected limit of 1.71 TeV. Physics Beyond the Standard Model submitted by Francesco Navarria Phys. Dept. and INFN, University of Bologna for the DELPHI Collaboration navarria@bo.infn.it
753 Lee Thompson (on behalf of the ACORNE collaboration) Acoustic detection of UHE neutrinos A interesting new possibility of detection of ultra-high energy (UHE) neutrinos is that of acoustic detection whereby the acoustic pressure pulse generated as a UHE neutrino interacts in a suitable medium such as water or ice is detected by an array of acosutic sensors. Recent years have seen something of a renaissance of this field and there are currently a number of activities worldwide to assess the potential of this technique. The UK-based ACORNE collaboration is one of these activities. The paper will present the status of ACORNE's R&D work, including simulation, potential neutrino flux sensitivities, calibration and data acquisition at an existing hydrophone array in Scotland. Astroparticle Physics, Gravitational Waves and Cosmology Note for convenor: this abstract proposes a paper specific to 1 project. I can, if required, present a short review talk on activities in this field. I did this last year at the TeV-II Astrophysics conference in Madison and am presenting a similar review talk at RICAP, Rome in June 2007. I can also review optical, radio and acoustic UHE neutrino detection techniques. l.thompson@sheffield.ac.uk
754 V. A. Huseynov (Guseinov), R. E. Gasimova Asymmetry in heating of electrons and positrons by neutrinos and antineutrinos in a strongly magnetized thermal plasma: polarization effects We have investigated asymmetry in heating of electrons and positrons by neutrinos and antineutrinos in a strongly magnetized thermal plasma with allowance for the polarizations of electrons. It is shown that asymmetry in heating is sensitive to neutrino (antineutrino) flavour and spin variables of initial electrons and positrons. Asymmetry in heating is determined with the fundamental parameters that contain the Weinberg angle. The numerical estimations of asymmetry in heating are performed. Some astrophysical applications are discussed. Neutrino Physics In most of my scientific papers my name is as V. A. Guseinov vgusseinov@yahoo.com
755 W. Chemissany, A. Ploegh and T. Van Riet Scaling Cosmologies, Geodesic Motion and Pseudo-Supersymmetry in Supergravity One-parameter solutions in supergravity carried by scalars and a metric trace out curves on the scalar manifold. In ungauged supergravity these curves describe a geodesic motion. It is known that a geodesic motion sometimes occurs in the presence of a scalar potential and for time-dependent solutions this can happen for scaling cosmologies. In this pedagogical talk we elaborate on such solutions in the context of pseudo-supersymmetry. In particular we show that scaling solutions that are pseudo-BPS must describe geodesic curves. Furthermore we clarify how to solve the geodesic equations of motion when the scalar manifold is a maximally non-compact coset such as occurs in maximal supergravity. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry I have been contacted at the end of May and thus agreed to pay the early fee only. t.van.riet@rug.nl
756 Felix Schwab (Speaker), Christoph Promberger, Sebastian Schatt FCNCs and CP violation in the Minimal 331 Model We investigate the flavor structure of the minimal 331 model and its implications for several flavor changing neutral current (FCNC) processes. In this model, where the weak SU(2)_L gauge group of the Standard Model is extended to a SU(3)_L, the by far dominant new contributions come from an additional neutral Z' gauge boson, that can transmit FCNCs at tree-level. We begin by studying the bounds obtained from quantities such as Delta M_K, epsilon_K, Delta M_{d/s} as well as sin 2 beta|_{J/psi K_S}, and go on to explore the implications for several clean rare decay channels, namely the decays K+->pi+ nu nu, K_L -> pi0 nu nu, B_{d/s} -> mu+ mu- and K_L -> pi0 l+l-. Flavour Physics and CP Violation Based on hep-ph/0702169, as well as potentially a future paper about influence of B -> Xs gamma schwab@ifae.es
757 Diego Guadagnoli D0 - D0bar mixing: theory introduction I discuss how the novel experimental data on D0 - D0bar mixing can be combined to provide information on the fundamental theoretical quantities describing the mixing itself. I then discuss the theoretical impact of the new data, focusing in particular on the MSSM. Flavour Physics and CP Violation Talk suggested for the Flavour Session. Title and Abstract can be modified. diego.guadagnoli@ph.tum.de
758 Jan Rosseel Generalized Chern-Simons terms in N=1 supergravity In this talk, we discuss general actions for matter-coupled N=1 supergravity, that include generalized Chern-Simons terms. We clarify the importance of these terms in ensuring gauge and supersymmetry invariance in case axionic shift symmetries are gauged. We show how this extension follows naturally from the embedding of the gauge group into the group of symplectic duality transformations. We also indicate the interplay of Peccei-Quinn terms, generalized Chern-Simons terms and anomalies in the context of N=1 supergravity. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry I've been contacted at the end of May and thus agree to pay the early fee. jan.rosseel@fys.kuleuven.be
759 G. C. Branco, M. N. Rebelo and J. I. Silva-Marcos Leptogenesis, Yukawa Textures and Weak-basis Invariants We show that a large class of sets of leptonic texture zeros considered in the literature imply the vanishing of certain CP-odd weak-basis invariants. These invariant conditions enable one to recognize a flavour model corresponding to a set of texture zeros, when written in an arbitrary weak-basis where the zeros are not manifest. We also analyse the r\^ ole of texture zeros in allowing for a connection between leptogenesis and low-energy leptonic masses, mixing and CP violation. For some of the textures the variables relevant for leptogenesis can be fully determined in terms of low energy parameters and heavy neutrino masses. Flavour Physics and CP Violation The talk, if accepted, would be pesented by Margarida Nesbitt Rebelo rebelo@ist.utl.pt
760 Rainer Wallny for the CDF Diamond Group A Beam Condition Monitoring System for the CDF Experiment Particle physics collider experiments at the high energy frontier are being performed today and in the next decade in increasingly harsh radiation environments. While designing detector systems adequate to these conditions represents a challenge in itself, their safe operation relies heavily on fast, radiation hard beam condition monitoring (BCM) systems to protect these expensive devices from beam accidents. The talk will present such a BCM system based on polycrystalline chemical vapor deposition (pCVD) diamond sensors designed for the Collider Detector at Fermilab (CDF) experiment operating at Fermilab's Tevatron proton-antiproton synchrotron. We report our operational experience with this system which was commissioned in the spring last year. The system currently represents the largest of its kind to be operated at a hadron collider. It is similar to designs being pursued by the next generation of hadron collider experiments at the Large Hadron Collider (LHC). Detectors and Data Handling wallny@physics.ucla.edu
761 TOTEM collaboration Total cross-section measurement and soft diffraction at LHC The TOTEM experiment is a dedicted forward experiment at LHC, sharing the interaction point with CMS. The TOTEM standalone program focuses on a precise total cross-section measurement complemented by studies of elastic scattering over a wide t-range (10^-3 to 10 GeV^2) and studies of soft diffraction over a wide proton momentum loss range. In addition, the combination of the CMS and TOTEM detectors provides an unprecedented coverage in pseudo-rapidity at a hadron collider and the two collaborations intend to carry out a joint diffractive and forward physics program covering fundamental aspects of soft QCD, diffraction in the presence of a hard scale as well as using central exclusive production as a tool for discovery physics. Here, a detailed study of an early total proton-proton cross-section measurement with a precision of ~ 5 % using a special 90 m low-luminosity LHC optics configuration is presented. Further benefits of this special optics configuration as a precise measurement of the proton momentum loss in diffractive processes over essentially the whole proton momentum loss range and a precise determination of the horizontal vertex distribution of the proton-proton interactions are discussed. Furthermore, the way to make a 1 % precise total pp cross-section measurement using another special low-luminosity LHC optics configuration (1540 m) is described. Finally, the diffractive physics potential of low-luminosity LHC running is shown. Strong Interactions kenneth.osterberg@helsinki.fi
762 Peter Fisher, Janet Conrad A high precision neutrino scattering experiment for the Tevatron NuOnG (Neutrinos On Glass) is the provisional name for a new experiment to carry out measurements from a neutrino beam at the Tevatron. The experiment uses glass as a target with proportional tube or scintillator readout every quarter radiation length. The target mass is about 2 kton. Three toroidal magnetic spectrometers spaced along the calorimeter identify and measure muons. The 5e19 800 GeV protons on target per year from the Tevatron, three years operation would allow high precision electroweak and structure function measurements that would complement the LHC and ILC, as well as search for new particles. A short description has been submitted to the Fermilab Steering Committee and an Expression of Interest to start running in roughly 2013-2015 is in preparation. High-Energy Electroweak Physics fisherp@mit.edu
763 Peter Fisher, Janet Conrad A high precision neutrino scattering experiment for the Tevatron NuOnG (Neutrinos On Glass) is the provisional name for a new experiment to carry out measurements from a neutrino beam at the Tevatron. The experiment uses glass as a target with proportional tube or scintillator readout every quarter radiation length. The target mass is about 2 kton. Three toroidal magnetic spectrometers spaced along the calorimeter identify and measure muons. The 5e19 800 GeV protons on target per year from the Tevatron, three years operation would allow high precision electroweak and structure function measurements that would complement the LHC and ILC, as well as search for new particles. A short description has been submitted to the Fermilab Steering Committee and an Expression of Interest to start running in roughly 2013-2015 is in preparation. Neutrino Physics fisherp@mit.edu
764 Peter Fisher, Janet Conrad A high precision neutrino scattering experiment for the Tevatron NuOnG (Neutrinos On Glass) is the provisional name for a new experiment to carry out measurements from a neutrino beam at the Tevatron. The experiment uses glass as a target with proportional tube or scintillator readout every quarter radiation length. The target mass is about 2 kton. Three toroidal magnetic spectrometers spaced along the calorimeter identify and measure muons. The 5e19 800 GeV protons on target per year from the Tevatron, three years operation would allow high precision electroweak and structure function measurements that would complement the LHC and ILC, as well as search for new particles. A short description has been submitted to the Fermilab Steering Committee and an Expression of Interest to start running in roughly 2013-2015 is in preparation. Detectors and Data Handling fisherp@mit.edu
765 C. Pallis F-term hybrid inflation followed by modular inflation We consider two-stage inflationary models in which a superheavy scale F-term hybrid inflation is followed by an intermediate scale modular inflation. We confront these models with the restrictions on the power spectrum of density perturbations $P_{\cal R}$ and the spectral index $n_{\rm s}$ from the recent data within the power-law cosmological model with cold dark matter and a cosmological constant. We show that these restrictions can be met provided that the number of e-foldings $N_{\rm HI*}$ of the pivot scale $k_*=0.002/{\rm Mpc}$ during hybrid inflation is appropriately restricted. The additional e-foldings required for solving the horizon and flatness problems can be naturally generated by the subsequent modular inflation of slow roll type realized by a string axion. Physics Beyond the Standard Model The relevant paper (hep-ph/0702260), with the collaboration of Prof. G. Lazarides, has been recently accepted for publication in Phys. Lett. B kpallis@auth.gr
766 Lee F. Thompson (on behalf of the KM3NeT Consortium) KM3NeT: designing a cubic kilometre scale neutrino telescope for the The KM3NeT consortium is currently designing and planning an interdisciplinary deep-sea observatory which will incorporate cubic kilometre scale neutrino telescope to be deployed in the Mediterranean Sea. The paper will review the challenges facing such a venture and will outline some of the technological solutions under review. The scientific programme that can be addressed by a detector of this scale will be presented and the potential performance of KM3NeT device will be summarised. Astroparticle Physics, Gravitational Waves and Cosmology l.thompson@sheffield.ac.uk
767 Frank Saueressig Recent results in 4-dimensional non-perturbative string theory The lack of a non-perturbative formulation is one of the main shortcomings of string theory as a full-fledged theory of quantum gravity. In some cases, however, supersymmetry and the dualities of the theory are powerful enough to fix the exact couplings in the low-energy effective action. In this talk we will consider the low energy effective action of type II string theory compactified on a generic Calabi-Yau threefold and review how SL(2,Z) invariance and quantum mirror symmetry of the theory can be used to determine and sum up the D(-1), D(1) and (some of the) D(2)-brane instanton corrections exactly. This provides a large class of four-dimensional N=2 supergravity theories where exact results to all orders in the inverse string tension and the string coupling constant are obtained. Non-Perturbative Field Theory, String Theory, Quantum Groups and Non-Commutative Geometry Invited talk by Prof. Dr. Mario Trigiante. (As I understand from the E-Mail, since I was contacted after May 30th to give this talk, my registration fee should be changed to early registration.) F.S.Saueressig@phys.uu.nl
768 Adam Matyja and The BELLE COLLABORATION B decays with missing energy at Belle We report the results of studies of $B$ decays with missing energy due to two or more neutrinos such as $B to \tau \nu$, $B \to D^{*} \tau \nu$ and $B \to h^{(*)} \nu \bar{\nu}$. The analysis uses a large data sample collected at the $\Upsilon (4S)$~resonance with the Belle detector at the KEKB asymmetric energy $e^+ e^-$~collider. Flavour Physics and CP Violation matyja@belle2.ifj.edu.pl
769 The D Collaboration Search for the Associated Production of Chargino and Neutralino in Final States with three Leptons with the D detector A search has been performed for the trilepton decay signature from the associated production of the lightest chargino and the next-to-lightest neutralino in leptonic channels of two muons plus a third lepton; and one muon and one electron plus a third lepton in the context of minimal Supersymmetry. The search uses data taken with the D detector at the Fermilab Tevatron pp-bar collider at a center-of-mass energy of 1.96 TeV corresponding to an integrated luminosity of around 1 fb^-1. No candidates have been found in the emul channel with an expected background of 0.94+0.40-0.13 events, while two candidates were found in the mumul channel consistent with the background expectation of 0.30+0.73-0.03 events. In combination with the results of two previously approved D trilepton analyses, new stringent limits on the associated production of charginos and neutralinos have been set. Physics Beyond the Standard Model harald.fox@physik.uni-freiburg.de
770 The CDF Collaboration Combined Limit of the CDF experiment for Searches for Chargino Neutralino Production in Multilepton Channels We present searches for Supersymmetry in multilepton signatures using data colected at a centre-of-mass energy of 1.96 TeV using the CDF II detector. The results are combined to obtain a limit on the cross section times branching ratio for chargino-neutralino production and decay into final states including two or more leptons. The limit is explored as a function of the chargino mass in two different scenarios. In the most favourable model, with a luminosity ranging between 700 and 1000pb-1, we can exclude chargino masses up to ~130 GeV/c^2 Physics Beyond the Standard Model Intended as one Tevatron talk together with the D0 result submitted as separate paper earlier. harald.fox@physik.uni-freiburg.de
771 G.C.Branco, D.Emmanuel-Costa, J.C.Romao Spontaneous CP Violation in a SUSY Model with a complex CKM It is pointed out that the recent measurement of the angle $\gamma$ of the unitarity triangle, providing irrefutable evidence for a complex Cabibbo-Kobayashi-Maskawa (CKM) matrix, presents a great challenge for supersymmetric models with spontaneous CP violation. We construct a new minimal extension of the minimal supersymmetric standard model (MSSM), with spontaneous CP breaking, which leads to a complex CKM matrix, thus conforming to present experimental data. This is achieved through the introduction of two singlet chiral superfields and a vector-like quark chiral superfield which mixes with the standard quarks. A $Z_3$ symmetry is introduced in order to have a potential solution to the strong CP problem. Flavour Physics and CP Violation david.costa@ist.utl.pt
772 F.Hautmann Unintegrated parton distributions After reviewing the motivation and theoretical status of unintegrated parton distributions, we present recent progress towards precise characterizations of these distributions and results from Monte-Carlo generators using u-pdf's. Strong Interactions francesco.hautmann@cern.ch
773 V. V. Dvoeglazov FERMION-FERMION AND BOSON-BOSON AMPLITUDES: SURPRISING SIMILARITIES Amplitudes for boson-boson and fermion-boson interactions are calculated in the 2nd order of perturbation theory in the Lobachevsky space. An essential ingredient of the used model is the Weinberg's 2(2j+1) component formalism for describing a particle of spin j, recently developed substantially. The boson-boson amplitude is then compared with the two-fermion amplitude obtained by Skachkov long ago on the ground of the Hamiltonian formulation of quantum field theory on the mass hyperboloid, p0^2- p^2 =M^2, proposed by Kadyshevsky. The parametrization of the amplitudes by means of the momentum transfer in the Lobachevsky space leads to same spin structures in the expressions of T-matrices for the fermion and the boson cases. However, certain differences are found. Possible physical applications are discussed. Physics Beyond the Standard Model This is my 2nd abstract for this session. I can give either of suggested talks, or both. valeri@planck.reduaz.mx
774 The D0 collaboration D0 results on Inclusive Jet production A broad range of physics can be studied in QCD jet production. Understanding high pT jets can help constrain Parton Distribution Functions whereas soft jets allow one to study soft physics and hadronization effects. Apart from that, knowledge of multi-jet production is essential for understanding standard model backgrounds to searches for new physics. A preliminary measurement is presented of the inclusive jet production cross section in proton-antiproton collisions at the D0 detector using an integrated luminosity of 900 inverse picobarn of Tevatron Run II data. The cross section is studied as a function of jet pT and rapidity and compared to perturbative QCD predictions in next-to-leading order including two-loop threshold corrections. Strong Interactions This talk should already have been listed, but probably the abstract was missing. jhegeman@nikhef.nl
775 C.Diaconu for H1Collaboration The first measurement of W production and of its helicities at HERA A measurement of the production cross section of events with an energetic isolated electron or muon and missing transverse momentum is presented along with the measurement of the single W production cross section and the W polarization fractions at HERA. The full HERA I+II data sample recorded with the H1 detector in the years 1994-2007 corresponding to an integrated luminosity of 481 pb-1 is used. The results are found to be in agreement with the Standard Model. High-Energy Electroweak Physics Also adapted for Searches Session diaconu@cppm.in2p3.fr
776 C.Diaconu for H1 Collaboration Search for Anomalous Single Top Production in $ep$ Collisions at HERA A search for single top quark production is performed in electron-proton collisions at HERA. The search exploits the full data set corresponding to an integrated luminosity of 482 pb^-1. The investigated model considers anomalous production of top quarks in a flavour changing neutral current process involving the coupling kappa_{t u gamma}. Decays of top quarks into a b quark and a W boson with subsequent decay of the W in the leptonic electron and muon channels are included. A multivariate analysis is performed to discriminate anomalous top quark production from Standard Model (SM) background processes, dominated by real W production. Upper limits on the anomalous top production cross section and on kappa_{t u gamma} are deduced. Physics Beyond the Standard Model diaconu@cppm.in2p3.fr
777 C.Diaconu (for H1 Collaboration) Azimuthal correlations in dijet events at low Q2 DIS Correlations in the azimuthal angle between dijets produced in deep inelastic e+p scattering events, collected by the H1 experiment during 1999-2000, have been investigated. Cross sections are presented as a function of the azimuthal separation between the two jets in the hadronic center of mass frame, Delta_phi*, in different regions of the photon virtuality Q2 and in different regions of the Bjorken scaling variable xbj. The results are compared to the predictions of QCD Monte Carlo Models as well as from NLO dijet (alphas**2) and NLO three-jet (alphas**3) calculations. Strong Interactions diaconu@cppm.in2p3.fr
778 C.Diaconu ( for H1 Collaboration) Inclusive Jet Production at high Q2 DIS ( HERA II) Inclusive jet production is studied in neutral current deep-inelastic positron-proton scattering at large four momentum transfer squared $Q^2>150\gev^2$ with the H1 detector using a data sample corresponding to an integrated luminosity of 320 pb-1 recorded at HERA II. Single and double differential inclusive jet cross sections are measured as a function of $Q^2$ and of the transverse energy $E_T$ of the jets in the Breit frame. The measurements are found to be well described by calculations at next-to-leading order in perturbative QCD. Strong Interactions diaconu@cppm.in2p3.fr
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