Bulletin of the American Physical Society
2008 APS April Meeting and HEDP/HEDLA Meeting
Volume 53, Number 5
Friday–Tuesday, April 11–15, 2008; St. Louis, Missouri
Session E11: Electroweak II |
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Sponsoring Units: DPF Chair: Erik Brubaker, Fermi National Accelerator Laboratory Room: Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), St. Louis B |
Saturday, April 12, 2008 3:30PM - 3:42PM |
E11.00001: Measurement of the W Boson Charge Asymmetry in the Electron Decay Channel David Khatidze We present a measurement of W boson production charge asymmetry in $p\bar{p}$ collisions as measured in W$\to$e$\nu$ decays. We use 1fb$^{-1}$ data collected with the D0 detector. Theoretical predictions made using CTEQ and MRST Parton Distribution Functions are compared with the measurement. [Preview Abstract] |
Saturday, April 12, 2008 3:42PM - 3:54PM |
E11.00002: Measurement of the charge asymmetry of the $W\rightarrow\mu\nu$ decay channel using the D\O\ detector Trang Hoang, Susan Blessing We describe preliminary results of the measurement of the $W\rightarrow\mu\nu$ production charge asymmetry in proton- antiproton collisions with a center of mass energy of 1.96 TeV at the Fermilab Tevatron Collider using the 1.1 fb$^{-1}$ data sample collected between 2006 and 2007 using the D\O\ detector. The asymmetry is measured in three muon momentum bins: $20 < p_{T}\leq 25$~GeV, $25 < p_{T}\leq 35$~GeV, and $p_{T}\geq 35$~GeV. With more data and better particle reconstruction, the measurement will provide a significant improvement in the statistical uncertainty compared with the previous measurement from D\O. [Preview Abstract] |
Saturday, April 12, 2008 3:54PM - 4:06PM |
E11.00003: Measurement of $W$ Boson Production Charge Asymmetry at CDF Bo-Young Han, Kevin McFarland, Eva Halkiadakis We present a measurement of the $W$ boson production charge asymmetry using the $W \rightarrow e\nu$ decay channel. We use data collected by the Collider Detector at Fermilab from $p\overline{p}$ collisions at $\sqrt{s}$ = 1.96 TeV. The data represent an integrated luminosity of 1 $fb^{1}$. Our measurement of the $W$ production charge asymmetry is compared to higher order QCD predictions generated using MRST2006 and CTEQ6 parton distribution functions. The asymmetry provides new input on the momentum fraction dependence of the u and d quark parton distribution functions within the proton. [Preview Abstract] |
Saturday, April 12, 2008 4:06PM - 4:18PM |
E11.00004: Identification of Electromagnetic Particles using the Forward Hadron Calorimeter at CMS Kevin Klapoetke The detection and identification of electrons and photons will be important for many anaylses at the LHC and the design of the CMS crystal electromagnetic calorimeter has been optimized for this purpose. CMS also has a forward hadronic calorimeter (HF) made up of quartz-fiber and iron. We describe how electromagnetic particles can be reconstructed and identified in the HF. Transverse and longitudinal shower shape variables distinguish between electromagnetic particles and jets. We describe the impact of identifying electromagnetic particles for physics analysis, specifically the measurement of the $Z$ boson. [Preview Abstract] |
Saturday, April 12, 2008 4:18PM - 4:30PM |
E11.00005: CMS Plans for Inclusive $Z$ Cross-Section Measurement in the Electron Channel Jason Haupt Measurement of the basic electroweak parameters will be one of the first priorities at CMS. We discuss the plan to measure the inclusive cross-section for Z production in the dielectron channel. All efficiencies which are to be derived from data are measured from the Z to ee decays via the tag and probe method. We show the results of testing this procedure with a nominal $10^{-1}$ pb of simulated data and applying the efficiencies to determine the inclusive cross-section. [Preview Abstract] |
Saturday, April 12, 2008 4:30PM - 4:42PM |
E11.00006: Measurement of Inclusive $W$ Production Cross Section in the Electron Channel Hai Duong Nguyen Precision electroweak measurements are one of the first priorities for the LHC physics program with the first data. We discuss measurement of the W production cross section in the electron decay channel usng the dta-driven approach to estimate signal efficiency and the background. The expected measurement uncertainties for the data sets corresponding to the integrated luminosities between 100 pb$^{-1}$ and 1 fb$^{-1}$ are discussed. [Preview Abstract] |
Saturday, April 12, 2008 4:42PM - 4:54PM |
E11.00007: Angular Distributions in unpolarized proton-induced Drell-Yan process Lingyan Zhu, Jen-Chieh Peng, Paul Reimer We will report a measurement of the angular distributions of Drell-Yan dimuons produced using an 800 GeV/c proton beam on a deuterium target. The muon angular distributions in polar angle $\theta$ and azimuthal angle $\phi$ have been measured over the kinematic range $4.5 < m_{\mu \mu} < 15$ GeV/c$^2$, $0 < p_T < 4 $ GeV/c, and $0 < x_F < 0.8$. The data will be compared with the angular distribution in unpolarized pion-induced Drell-Yan, in terms of angular coefficients and the Lam-Tung relation. The expectations from two models will be discussed. One involves QCD vacuum effect and the other involves transverse-momentum-dependent Boer-Mulders structure function $h_1^\perp$. The preliminary results with proton target will be also presented. [Preview Abstract] |
Saturday, April 12, 2008 4:54PM - 5:06PM |
E11.00008: Measurement of the Mass of the $\tau$ Lepton Parker Lund Using a pseudomass technique, we present the first precision measurement with the BaBar detector of the mass of the $\tau$ lepton using $\tau \rightarrow 3\pi \nu_{\tau}$ decays. The measurement will use 446 million $\tau^{+}\tau^{-}$ pairs produced in the 485 $fb^{-1}$ of data collected by the BaBar detector at the PEP-II asymmetric-energy $B$ Factory. [Preview Abstract] |
Saturday, April 12, 2008 5:06PM - 5:18PM |
E11.00009: Measurement of the Charged Kaon Mass Using the MIPP RICH Nick Graf The current charged kaon mass of $493.677$ MeV $\pm26$ parts per million (ppm) is dominated by two measurements of kaonic atom x-ray energies. These measurements have precisions of 14 and 22 ppm, respectively, and differ by 122 ppm. Given its importance in measurements of $V_{us}$ from $K^{+}$ decay, resolution of the ambiguity in charged kaon mass measurements is needed. This talk describes a method for making a measurement with 40 ppm statistical precision from the correlation between $p$, $\pi$, and $K$ RICH radii and precisely known values of proton and pion masses. Analysis of data from the Main Injector Particle Production (MIPP) experiment taken during spring 2006 at Fermilab is presented. [Preview Abstract] |
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