Particle Physics Seminars Autumn 2006
Seminars 2003 Seminars Spring 2004 Seminars Autumn 2004Seminars 2005 Seminars Spring 2006
New location: Moseley Lecture Theatre
Usual time: Wednesdays 2-3pm
Wed. 20 Sept. | Adnan Bashir (Durham) | Theory |
14:00 Moseley | Gauge Invariant Masses (Sparing the Blushes of Ward Identities) | |
Abstract | ||
Mon. 25 Sept. | Mike Albrow (FNAL) | Special Seminar |
16:00 Moseley | Exclusive Central Production in Proton-Proton Collisions: from Glueballs to Higgs. | |
Abstract | ||
Wed 27 Sept. | Guennadi Borissov (Lancaster) | Experiment |
14:00 Moseley | B Physics at D0 | |
Wed 11 Oct. | Kostya Novoselov | Schuster Colloquium |
14:30 Bragg | QED in a Pencil Trace | |
Graphene: a newly discovered system of a single layer of atoms with massless electrons. | ||
Tues 17 Oct. | Ki-Young Choi (Sheffield) | Astroparticle |
12:00 Moseley | Gravitino Dark Matter in the CMSSM | |
Abstract | ||
Wed 18 Oct. | John Campbell (Glasgow) | Theory |
14:00 Moseley | Higgs Boson Production in Association With Two Hard Jets | |
Abstract | ||
Tues 24 Oct. | T.E.J. Underwood (Durham) | Astroparticle |
12:00 Moseley | The Minimal Phantom Sector of the Standard Model: Higgs Phenomenology and Dirac Leptogenesis | |
Abstract | ||
Wed 25 Oct. | Un-Ki Yang (Manchester) | Experiment |
14:00 Moseley | Latest measurement of top mass at CDF | |
Slides | ||
Wed 1 Nov. | Durgaprasad P. Roy (Tata Inst. Mumbai & Durham) | Theory |
14:00 Moseley | Prospects of Charged Higgs Boson Discovery at Colliders | |
Abstract | ||
Tues 7 Nov. | Antonio De Felice (Sussex) | AstroParticle |
12:00 Moseley | Generalized Modified Gravity Models: ghosts and dynamical bounds | |
Abstract | ||
Wed 8 Nov. | Prof. Wolfgang Demtroder | Schuster Colloquium |
14:30 Bragg | New Techniques in High Resolution Spectroscopy | |
Several new methods for detecting small concentrations in the atmosphere | ||
Wed 15 Nov. | Joerg Jaeckel (Durham) | Theory |
14:00 Moseley | Photons as a Probe of fundamental Physics | |
Abstract | ||
Tues 21 Nov. | David Maybury (Oxford) | Astroparticle |
11:50 Moseley | Phenomenological Aspects of Axions in Warped Extra Dimensions | |
Abstract | ||
Wed 22 Nov. | David Evans (Birmingham) | Experiment |
14:00 Moseley | Alice and the Physics of Quark Matter | |
Wed 29 Nov. | Yazid Delenda (Manchester) | Theory |
14:00 Moseley | Impact of kt algorithm on QCD resummation | |
Abstract | ||
Thurs 30 Nov. | John Ellis (CERN) | Exceptional Seminar |
12:00 Moseley | Novel signatures for supersymmetry | |
Tues 5 Dec. | Richard Battye (Manchester) | Astroparticle |
11:50 Moseley | Constraints on Supersymmetric Hybrid Inflation | |
Abstract | ||
Wed 6 Dec. | Prof. John Dainton, FRS | Schuster Colloquium |
14:00 Moseley | The Cockroft Institute | |
A new adventure at the forefronts of basic research and applications | ||
Wed 13 Dec. | Athanasios Dedes (Durham) | Theory |
14:00 Bragg | Higgs penguin effects at Tevatron, B-factories and LHC | |
Abstracts
Mike Albrow,
Exclusive Central Production in Proton-Proton Collisions:
from Glueballs to Higgs (2006-09-25)
In high energy proton-proton collisions it is possible for both protons to be
diffractively scattered, losing only a few percent of their energy in creating
a central state. At the LHC it should be possible to create Higgs bosons (if
they exist) this way, a form of "vacuum excitation". If so, using part of the
LHC accelerator as a spectrometer, we can measure the Higgs mass, spin and
other quantum numbers from the very forward protons.
Ki-Young Choi,
Gravitino Dark Matter in the CMSSM (2006-10-17)
Gravitino is still a good candidate for dark matter. We
investigate the possibility of Gravitino as Dark Matter and the
implications in the Constrained Minimal Supersymmetric Standard
Model (CMSSM). We calculate the relic density of Gravitino from
thermal and non-thermal process and consider the constraints from
Colliders and Cosmology. Assuming the Gravitino mass around GeV,
we find the Gravitino can be Dark Matter with stau as next
Lightest Supersymmetric Particle. One of the notable prediction of
Gravitino dark matter is that cosmic Lithium problems can be
solved in this scenario from the decay of stau in the early
Universe. The other implication of Gravitino dark matter is that
we can infer the vacuum structure of our Universe from considering
the scalar potentials in the CMSSM.
John Campbell,
Higgs Boson Production in Association With Two Hard Jets (2006-10-18)
The search for the origin of electroweak symmetry breaking is one of
the primary goals of the LHC programme. In the Standard Model this
breaking is achieved by introducing a Higgs boson which has so far
eluded all searches at LEP and the Tevatron. In this talk I will
discuss two of the most promising Higgs production channels, via
gluon fusion and vector boson fusion, and discuss how they may be
used to probe properties of the Higgs boson. In so doing, I will
introduce a recent calculation of the next-to-leading order QCD
corrections to the production of a Higgs boson and two hard jets via
gluon fusion.
T.E.J. Underwood,
The Minimal Phantom Sector of the Standard Model: Higgs Phenomenology and Dirac Leptogenesis
(2006-10-24)
We propose the minimal, lepton-number conserving, SU(3)xSU(2)xU(1)
gauge singlet, or phantom, extension to the Standard Model. The model
provides Dirac neutrinos using couplings of O(1), imitating the Majorana
see-saw. We find that small neutrino masses and successful Dirac
leptogenesis imply that a phantom sector, global U(1) should be
spontaneously broken at the electroweak scale - triggering consistent
electroweak symmetry breaking. The existence of a Goldstone boson
suppresses the Higgs to bb branching ratio and instead the Higgs bosons
will mainly decay to invisible Goldstone and/or to visible vector boson
pairs. The implications of this scenario for the LHC are examined, and
we note that this may be an interesting scenario to study with central
exclusive diffractive Higgs production.
Durgaprasad P. Roy,
Prospects of Charged Higgs Boson Discovery at Colliders (2006-11-01)
After a brief introduction to the Charged Higgs boson in the MSSM I shall
discuss the signatures of a relatively light Charged Higgs boson in top
quark decay. Then I shall consider the signatures of a heavy Charged Higgs
boson at LHC in the MSSM as well as some common extensions like NMSSM and
CPV-MSSM. I shall conclude with a brief discussion of SUSY quantum
corrections to the Charged Higgs boson signatures.
Antonio De Felice,
Generalized Modified Gravity Models: ghosts and dynamical bounds (2006-11-07)
Modified gravity models seem to have classical instabilities,
ghosts degrees of freedom and superluminal modes. Besides these
constraints new dynamical bounds have found to be typical of these
models. The cosmological nature of all these constraints is
discussed.
Joerg Jaeckel,
Photons as a Probe of fundamental Physics (2006-11-15)
Recently the PVLAS collaboration reported a non-vanishing signal for a
rotation in the polarization of laser light passing through a strong magnetic
field. Motivated by this observation we discuss possible explanations such as
the production of axion like particles or millicharged particles. We point out
that suitable millicharged particles occur naturally in the hidden sector of
string theory. To test and distinguish between these scenarios one can use a
variety of experiments, e.g. ''light shining through a wall'' experiments or
setups looking for the nonperturbative Schwinger pair production in the
electric fields of accelerator cavities. Finally, for all those who are still
not willing to come to this talk we stress that the mass scale of the
suggested new particles is of the order of meV, the mysterious scale of
neutrinos, dark energy etc.
David Maybury,
Phenomenological Aspects of Axions in Warped Extra Dimensions (2006-11-21)
Motivated by multi-throat considerations, we study the phenomenological
implications of a bulk axion in a slice of AdS with a large extra dimension.
In particular, we examine the differences of axion physics with a warped
geometry relative to flat compactifications. As in flat compactification
scenarios, we find that the mass of the axion can become independent of the
underlying Peccei-Quinn scale. We find that the axion's invisibility and
cosmological viability remain essentially unaltered in comparison to flat
compactifications.
Yazid Delenda,
Impact of kt algorithm on QCD resummation
We study the effect of the kt clustering algorithm on QCD predictions for
energy flow observables. We perform a resummation of the large logarithms
involved in the study, that for the first time accounts properly for the
use of the kt clustering algorithm. We provide a prediction based on
these studies for ZEUS photoproduction data and point to studies in other
collider experiments where these observations will be important.
Richard Battye,
Constraints on Supersymmetric Hybrid Inflation
We will summarise the constraints on inflationary models provided by the
recent WMAP3 data and in particular focus on models of SUSY hybrid
inflation which predict a spectral index between 0.98 and 1. These models
can be made to be compatible with the data by taking into account a
sub-dominant contribution to the anisotropy due to the cosmic strings
formed during the phase transition at the end of inflation.
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