IOP HEPP Particle Physics 2008

Session

Parallel 1A: Collider Physics - QCD and Electroweak

31 Mar 2008, 15:30

Lancaster University

21. Measurement of beauty photoproduction at HERA II with the ZEUS detector

Sarah Boutle (UCL)

31/03/2008, 15:30

QCD

Beauty photoproduction has been measured with the ZEUS detector using a sample of 124pb^1 of HERA II data. The beauty content of a sample with two jets and a muon was analysed exploiting the muon impact parameter, using information from the silicon vertex detector, and the transverse momentum of the muon relative to the closest jet. Differential cross sections for beauty production as a...

32. A data driven measurement of W and Z boson production cross sections in ATLAS

Ms Ellie Dobson (University of Oxford)

31/03/2008, 15:43

Electroweak & Top Physics

An important aim of the LHC is the precise measurement of W and Z boson production cross sections, as these may be used to extract fundamental electroweak parameters as well as further test and constrain existing QCD models. In first data they may also be used as 'standard candle events' to understand detector performance. Any significant deviation from the predicted behaviour of these...

35. POWHEG NLO matching in the Herwig++ Monte Carlo Event Generator

Mr Jon Tully (Durham University)

31/03/2008, 15:56

QCD

POWHEG is a novel method for combining fixed order NLO calculations with parton showers. In this work the scheme is fully implemented in the Herwig++ Event Generator for electron positron annihilation and Drell Yan vector boson production processes.

37. W and Z Measurements with Initial CMS Data

Mr David Wardrope (Imperial College London)

31/03/2008, 16:09

Measurements of the inclusive cross-sections of W and Z in their leptonic decay modes will be among the first results from the LHC. An overview of the motivation and plans for such measurements with CMS will be presented, with emphasis on describing the use of data-driven methods for efficiency and background determination.

42. Reconstruction of Z->tautau->e+tau jet events using early data with CMS

Mr Petridis Konstantinos (Imperial College)

31/03/2008, 16:22

We report on the selection and reconstruction strategy for Z->tautau->e+tau jet events, and and their application in CMS with early data, as a benchmark for SUSY H/A->tautau->e+tau jet and tau tagging efficiency measurement. Using Monte Carlo simulated data, the performance of the reconstruction algorithms is evaluated. The number of expected signal and background events for 100 pb^-1 of...

47. The Inclusive Jet Cross-Section at ATLAS (ApplGrid)

Mr Daniel Robert Clements (University of Glasgow)

31/03/2008, 16:35

The ATLAS experiment will provide an opportunity to explore interactions at higher energies than previous detectors; allowing a test of standard model predictions, as well as opening the possibility of 'new physics' discoveries. The inclusive jet cross-section at high pT is one measurement which may provide evidence of physics `beyond the standard model', however a thorough understanding of...

62. The CMS L1 trigger: from LHC to SLHC

Mr Rose Andrew William (Imperial College - University of London)

31/03/2008, 16:48

The LHC has been described as a statistics machine, using very high interaction rates to compensate for the very low cross-sections of ‘new’ (interesting) physical processes. Were the detector to be read out continually a data rate of around 5x10^7 Mbyte/s (~50Tbyte/s) would be routine, the vast majority of which is of no interest. To reduce this to a storable (100MByte/s) rate, two levels of...

87. CMS upgrade studies

Mr Mark Pesari (Imperial College)

31/03/2008, 17:01

A luminosity upgrade to 1035 cm-2 s-1 for the LHC is expected after 2016. In order to maintain physics performance, the CMS experiment will also require upgrading; principally to the tracking and triggering systems, since detector occupancies and trigger rates are expected to be much higher. We report on ongoing studies into possible tracker designs and the feasibility of using tracking...