Bulletin of the American Physical Society
2009 APS April Meeting
Volume 54, Number 4
Saturday–Tuesday, May 2–5, 2009; Denver, Colorado
Session R14: QCD Physics |
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Sponsoring Units: DPF Chair: Cecilia Gerber, University of Illinois, Chicago Room: Plaza Court 4 |
Monday, May 4, 2009 1:30PM - 1:42PM |
R14.00001: Multi-jet studies at CMS in LHC Suvadeep Bose Prospects of QCD studies with multi-jet events at the CMS experiment at the Large hadron Collider are presented. Kinematic distributions of 3-jet and 4-jet events reveal the vector nature of gluon and gluon self coupling which are essential features of QCD. Monte Carlo simulations at 10 TeV of proton-proton center of mass energy are used to study the selection of the multi-jet samples and to measure the various multi-jet kinematic and topological distributions involving corrections due to detector effects. The various sources of systematic uncertainties are examined. For three and four jet events, the kinematic and topological variables discussed are the energy fractions carried by the leading jets and the angles between the planes containing the jets. [Preview Abstract] |
Monday, May 4, 2009 1:42PM - 1:54PM |
R14.00002: Measurements of Multijet Production at $\sqrt{s}$ = 1.96 TeV in the D0 experiment Scott Atkins We analyze the data set corresponding to an integrated luminosity of 0.7 fb$^{-1}$ taken with the DZero detector at the Fermilab Tevatron collider. Recent measurements on multijet production in hadron collisions at $\sqrt{s}$ = 1.96 TeV are presented. The measured observables are dijet angular distributions and the ratio of 3-jet to 2-jet cross-sections (R3/2). Dijet angular distributions are measured in different regions of dijet mass and are used to set limits on new physics models like quark compositeness and extra spatial dimensions. The ratio R3/2 is measured as a function of transverse jet momentum. [Preview Abstract] |
Monday, May 4, 2009 1:54PM - 2:06PM |
R14.00003: Inclusive Jet Production in Z+jets final states Stefano Camarda We present preliminary results on inclusive Z+jets production in $\rm p\bar{p}$ collisions at $\rm \sqrt{s}$ = 1.96 TeV. The measurements are based on ~3 {$\rm fb {}^{-1}$} of data collected by the CDF experiment in Run II, and both the electron and muon Z-decay channels are considered. The measured cross sections are corrected for detector effects back to the hadron level and compared to NLO parton-level pQCD prediction including non-pQCD corrections. The analysis is performed in the context of studies on irreducible backgrounds in searches for new physics. [Preview Abstract] |
Monday, May 4, 2009 2:06PM - 2:18PM |
R14.00004: ABSTRACT WITHDRAWN |
Monday, May 4, 2009 2:18PM - 2:30PM |
R14.00005: ABSTRACT WITHDRAWN |
Monday, May 4, 2009 2:30PM - 2:42PM |
R14.00006: Measurement of the top pair production cross section in the dilepton decay channel at CDF Chang-Seong Moon We present a measurement of the $t\bar{t}$ production cross section in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV using 2.8 fb$^{-1}$ of data collected by the CDF detector at the Fermilab Tevatron. We use $t\bar{t}$ dilepton events reconstructed with missing transverse energy and jets assuming top quark mass $m_t$ = 175 GeV/c$^2$. We measure $\sigma_{ t\bar{t}} = 6.13 \pm 0.88_{stat} \pm 0.40_{syst} \pm 0.38_{lumi}$ pb. [Preview Abstract] |
Monday, May 4, 2009 2:42PM - 2:54PM |
R14.00007: ABSTRACT WITHDRAWN |
Monday, May 4, 2009 2:54PM - 3:06PM |
R14.00008: Measurement of the ttbar Production Cross Section in the Lepton+Jets Channel with Lifetime Tagging Dookee Cho, Sehwook Lee We present a measurement of the production cross section at a center-of-mass energy of 1.96 TeV. This analysis is based on the selection of events with one charged lepton (electron or muon), missing transverse energy, and 3 or more jets. We utilize the e+jets and mu+jets data samples corresponding to integrated luminosity of 4 fb$^{-1}$ collected using the D0 detector. To help distinguish the signal from the background processes, we use a neural network algorithm that uses lifetime information to identify the b-quark jets that are associated with top quark decays. We require at least one b-tagged jet to be identified in this analysis. [Preview Abstract] |
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