Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session C13: W and Z Bosons II |
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Sponsoring Units: DPF Chair: Sarah Eno, University of Maryland Room: Hyatt Regency Dallas Cumberland G |
Saturday, April 22, 2006 1:30PM - 1:42PM |
C13.00001: Measurement of the Drell-Yan Cross Section in $p\bar{p}$ Collisions at the Tevatron Jane Nachtman, Michael Schmitt A preliminary measurement of the Drell-Yan cross section $\sigma(p\bar{p}\rightarrow\mu^+\mu^-)$ for dimuon masses in the range 30 - 200 GeV$/c^2$ is presented. The data were taken by the CDF Collaboration, and correspond to an integrated luminosity of $\approx$340 pb$^{-1}$ for $p\bar{p}$ collisions at an energy of 1.96~TeV$/c$. NLO calculations of this cross section are compared to the data. [Preview Abstract] |
Saturday, April 22, 2006 1:42PM - 1:54PM |
C13.00002: Measurement of the $p\bar{p} \rightarrow W$ Cross Section using Forward Electrons Jose Enrique Garcia, Giorgio Chiarelli, Martin Ciljak, Ivan Fedorko, Sandra Leone, Antonio Sidoti, Athanasios Staveris We present an updated measurement of the $W$ boson production cross section using electrons identified in the rapidity region $1.2<|\eta|<2.8$ in 223 pb$^{-1}$ of CDF~II data collected from 2002 to 2004. $W \rightarrow e\nu$ events are selected using the combined information from the forward calorimeter and silicon tracking detectors. The result agrees with NLO theoretical predictions and with previous measurements using reconstructed central leptons ($|\eta|<1$). [Preview Abstract] |
Saturday, April 22, 2006 1:54PM - 2:06PM |
C13.00003: A New Method to Measure the Ratio of~$W$ and~$Z$ Cross Sections Katherine Copic, Victoria Martin, Michael Schmitt We present a new method for measuring the ratio, $R$, of the cross sections for~$W$ and~$Z$ production in $p\bar{p}$~collisions at the Fermilab Tevatron. A combined sample of $W$ and $Z$ boson candidates is selected by requiring at least one charged lepton and low net hadronic activity. The~$p_T$ spectrum of the leptons is used to infer the relative rate of $W$ and $Z$ production. We obtain a preliminary measurement of~$R$ using data collected with the CDF~II detector corresponding to an integrated luminosity of approximately $350$~pb$^{-1}$ and extract an indirect value for the width of the $W$~boson. [Preview Abstract] |
Saturday, April 22, 2006 2:06PM - 2:18PM |
C13.00004: Measurement of differential cross section for Z boson production at Dzero Lei Wang The Tevatron has delivered more than 1/fb of proton-antiproton data with a center of mass energy of 1.96 TeV to the collider experiments.~Using events containing two high $p_T $ electrons with $\left| \eta \right|<1$, we show results of a preliminary measurement of the Z boson cross section and the differential distribution $d\sigma (Z\to e^+e^-)/dp_T $ using the full data sample taken by the Dzero experiment before December 2005. [Preview Abstract] |
Saturday, April 22, 2006 2:18PM - 2:30PM |
C13.00005: Measurement of the Transverse Momentum Distribution for $Z$ Boson Production at the Tevatron W. David Dagenhart We present a measurement of the transverse momentum distribution for $\sigma(p\bar{p}\rightarrow Z/\gamma^{\ast}) \cdot Br(Z/\gamma^{\ast}\rightarrow\mu\mu)$ in the 66~GeV/$c^{2}$ to 116~GeV/$c^{2}$ $Z/\gamma^{\ast}$ mass range using CDF Run~II data corresponding to an integrated luminosity of 337 pb$^{-1}$. In the low $p_T$ region this distribution is determined by soft gluon radiation and experimental measurements constrain models of this process. These constraints reduce the systematic uncertainty associated with the $W$ boson $p_{T}$ spectrum in Tevatron measurements of the $W$ boson mass. [Preview Abstract] |
Saturday, April 22, 2006 2:30PM - 2:42PM |
C13.00006: Study of Z+Photon production and limits on anomalous couplings at Dzero Alexei Ferapontov We present a measurement of Z+Photon production cross section and limits on anomalous Z Z Photon and Z Photon Photon couplings for form-factor scales of Lambda = 750 and 1000 GeV. The measurement is based on approximately 1/fb of integrated luminosity collected by Dzero detector at a center-of-mass energy of 1.96 TeV. [Preview Abstract] |
Saturday, April 22, 2006 2:42PM - 2:54PM |
C13.00007: Measurement of W+Photon events at Dzero Gregory Pawloski 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. [Preview Abstract] |
Saturday, April 22, 2006 2:54PM - 3:06PM |
C13.00008: QCD inputs to W Mass Measurement Timothy Andeen We present a study of the sensitivity of W boson mass measurement to various QCD input parameters. In high statistics measurements at the Tevatron these parameters will be a significant source of the uncertainty. In particular, we have investigated how the concurrent measurements of the Z boson transverse momentum distribution and the W boson charge asymmetry during Run II of the Tevatron can help to constrain these inputs. [Preview Abstract] |
Saturday, April 22, 2006 3:06PM - 3:18PM |
C13.00009: A Direct Measurement of the $W$ Boson Width Emily Nurse, Valeria Bartsch, Daniel Beecher, Mark Lancaster, Sarah Malik, Troy Vine, David Waters We present a direct measurement of the $W$ boson width using CDF~II electron and muon decay channel data with respective integrated luminosities of 377 pb$^{-1}$ and 330 pb$^{-1}$. The measurement is made by fitting the $W$ boson transverse mass distribution, and the result provides a constraint on potential exotic decay modes of the $W$ boson. [Preview Abstract] |
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