Particle Physics Group



High Energy Physics Seminars 2003

Schuster Colloquia: 2.30-3.30pm, Bragg Lecture Theatre

Normal seminar coordinates: Wednesdays 2-3pm, Moseley Lecture Theatre

Wednesday 24 Sept   Dr Beate Heinemann (CDF - Liverpool) Experiment

     Electroweak, Top and QCD Results from CDF in Run 2 at the TeVatron   (Abstract)

Tuesday 30 Sept, at 3pm
Blackett Lecture Theatre
  Dr Jenny Thomas (UCL) Experiment

MINOS and neutrinoless double-beta decay

Wednesday 8 Oct, 2.30pm   Dr John Ellis FRS (CERN)      SCHUSTER COLLOQUIUM


Wednesday 15 Oct   Dr Nikolaos Kidonakis (Cambridge) Theory

     A unified approach to master formulas for NNLO soft and virtual corrections in QCD, electroweak and SUSY processes   (Abstract)

Wednesday 22 Oct   Dr Apostolos Pilaftsis (Manchester) Theory

Resonant Leptogenesis and Neutrino Data   (Abstract)

Friday 24 Oct
Niels Bohr Common Room
  Dr Carlo Oleari (Durham) Theory

Next-to-leading order corrections to Higgs boson production via vector-boson fusion: signal and backgrounds   (Abstract)

Wednesday 29 Oct   Dr Judith McGovern (Manchester) Theory/Experiment

Pentaquarks, fact or fiction

Wednesday 5 Nov   Dr Gavin Salam (Paris) Theory

Generalized resummation of QCD final-state observables   (Abstract)

Wednesday 12 Nov, 2.30pm   Prof Helen Gleeson (Manchester)      SCHUSTER COLLOQUIUM


Wednesday 19 Nov       IOP half-day meeting on B physics  

Monday 24 Nov at 3pm
Bragg Lecture Theatre
  Dr Agustin Sabio-Vera (Cambridge and Hamburg) Theory

New Avenues in Small x Phenomenology

Wednesday 26 Nov   Dr Albrecht Kyrieleis (Manchester) Theory

The real corrections to the photon impact factor    (Abstract)

Wednesday 3 Dec   Dr Athanasios Dedes (Durham) Theory

The R-Parity Violating Minimal SuperGravity Model    (Abstract)

Wednesday 10 Dec, 2.30pm   Prof Hugh McCann (UMIST)      SCHUSTER COLLOQUIUM


Tuesday 16 Dec 4.30pm
Venue: TBA
  Dr Stefan Soldner-Rembold (Manchester) Experiment

Protons in the Prairie - Status and Perspectives of the D0 Experiment

Wednesday 17 Dec   Dr Nick Barlow (Manchester) Experiment

Studies of the decay B->eta_c K at the BaBar experiment    (Abstract)


24 Sept, B Heinemann:
An overview over the CDF experiment at the TeVatron at Fermilab near Chicago is given. So-called Run 2 which aims at accumulating more than 20 times more data than Run 1 has started about two years ago and I will present some of the recent results based on an integrated luminosity of about 120 pb-1. The focus will be on new measurements in the electroweak, top and QCD sector and their relevance to the physics at the LHC at CERN.

15 Oct, N Kidonakis:
I present a unified approach to calculating the next-to-next-to-leading order (NNLO) soft and virtual QCD corrections to cross sections for electroweak, Higgs, QCD, and SUSY processes. I derive master formulas that can be used for any of these processes in hadron-hadron and lepton-hadron collisions. The formulas are based on a unified threshold resummation formalism and can be applied to both total and differential cross sections for processes with either simple or complex color flows and for various factorization schemes and kinematics.
I present detailed phenomenological results for top quark production at the Tevatron and for direct photon production. I also briefly discuss the production of charged Higgs bosons; massive electroweak vector bosons; top quarks via flavor-changing neutral current processes; and squarks and gluinos.

22 Oct, A Pilaftsis:
I briefly review the theoretically appealing scenario of baryogenesis through leptogenesis induced by the out-of-equilibrium decays of heavy Majorana neutrinos. Recently, it has been found that if two of the heavy Majorana neutrinos have a mass difference comparable to their decay widths, then the phenomenon of separation of leptons from anti-leptons gets resonantly amplified. Hence, this scenario has been called resonant leptogenesis. We show that resonant leptogenesis can be realized with heavy Majorana neutrinos even as light as 0.5-1 TeV, in complete agreement with the current solar and atmospheric neutrino data. The prospects of testing this novel scenario of baryogenesis in low-energy and collider experiments are briefly discussed.

24 Oct, C Oleari:
The vector-boson fusion process is expected to provide crucial information on Higgs boson couplings at the Large Hadron Collider at CERN. The achievable statistical accuracy demands comparison with next-to-leading order QCD calculations, and the capability to disentangle the signal from the backgrounds.
I present the calculation of these corrections and the kinematical cuts to apply to suppress the backgrounds.

5 Nov, G Salam:
The resummation of logarithmically-enhanced terms to all perturbative orders is a prerequisite for many studies of QCD final states. Until now such resummations have always been performed by hand, for a single observable at a time. In this seminar I will discuss the physical basis for such resummations and show how to exploit this understanding to allow a computer program to automatically carry out resummations for arbitrary observables. Novel applications include the first next-to-leading logarithmic resummations of event shapes in dijet production at hadronic colliders.

26 Nov, A Kyrieleis:
The high energy limit is of particular importance for the understanding of the transition from perturbative QCD to hadron physics. In this limit, calculations at fixed order of the coupling are insufficient, contributions from all orders of the coupling have to be considered. The BFKL approach which allows to resum all these contributions is discussed. This approach implies the notation of impact factors incorporating the properties of the scattering particles. The NLO corrections to BFKL have turned out to be important. The photon impact factor at NLO will allow for the first stringent test of NLO BFKL. In particular the real corrections to this impact factor and first numerical results are addressed.

3 Dec, A Dedes:
I will present the minimal supersymmetric standard model with general broken R-parity, focusing on minimal supergravity (mSUGRA).
I shall discuss:
a) origins of lepton number violation b) scalar potential c) neutrino masses d) signatures at colliders

17 Dec, N Barlow:
The BaBar detector is situated at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center (SLAC). One of the primary goals of the BaBar experiment was the precise measurement of the CP-violation parameter known as sin2beta, which can be cleanly measured in neutral B decays to charmonium final states. One such decay mode is B->eta_c K. I will describe a measurement of the branching fraction of this decay, and give a brief summary of a time-dependent CP violation analysis using this decay channel.

For help with AV equipment: Joe Lee, ext 54038 (please give 2-3 days notice)
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