Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session B13: W and Z Bosons I |
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Sponsoring Units: DPF Chair: Peter Nemethy, New York University Room: Hyatt Regency Dallas Cumberland G |
Saturday, April 22, 2006 10:45AM - 10:57AM |
B13.00001: W/Z/Higgs Production at LHC and PDF Uncertainties Fredrick Olness At the LHC, W and Z boson production will be used as ``benchmark'' processes to calibrate various searches for the Higgs boson, SUSY, and other ``new physics'' processes. In the context of the PDF global analysis, we examine current data from HERA, Tevatron, and fixed-targets to properly quantify the PDF uncertainties. This helps us distinguish ``new physics'' from ``old physics,'' and thereby maximize the discovery potential of the LHC. [Preview Abstract] |
Saturday, April 22, 2006 10:57AM - 11:09AM |
B13.00002: Study of Inclusive WZ Events in Trilepton Final States at Dzero James Degenhardt Presented is a study of the WZ di-boson events using data with integrated luminosity of about 1/fb collected by Dzero at the Fermilab Tevatron with a center-of-mass energy of 1.96 TeV. The signal from process of WZ to tri-leptons and associated background are studied in detail, which has resulted the first measurement of the WZ production cross-section in a hadron collider experiment. The most restrictive anomalous coupling limits using WZ production from a hadron collider are also set. [Preview Abstract] |
Saturday, April 22, 2006 11:09AM - 11:21AM |
B13.00003: Search for $WZ$ Production at the Tevatron Kevin McCarthy, Shih-Chieh Hsu, Elliot Lipeles, Mark Neubauer, Frank W\"urthwein We present a search for $WZ$ production using $\approx$800 pb$^{-1}$ of data accumulated with the CDF~II detector. Our event selection criteria of three charged leptons and missing transverse energy is sensitive to $p\bar{p} \rightarrow WZ \rightarrow \ell\nu\ell\ell$ production. The main background sources to this channel are dilepton final states from Drell-Yan and top quark production with a hadronic jet misidentified as a lepton. [Preview Abstract] |
Saturday, April 22, 2006 11:21AM - 11:33AM |
B13.00004: Search for $WZ$ and $ZZ$ Production in the Dilepton Plus Dijet Final State at the Tevatron Jonathon Efron, Beate Heinemann, Richard Hughes, Ben Kilminster, Andy Mehta, Brian Winer We present a search for diboson production using $\approx$700 pb$^{-1}$ of CDF~II dilepton plus dijet data. This final state is sensitive to both $ZZ \rightarrow \ell\ell q\bar{q}$ and $ZW \rightarrow \ell\ell q\bar{q}'$ production. The signal can be discriminated from the main background of $Z$ bosons produced in association with jets using the dijet mass distribution. Observation of diboson production in this final state is an important step in the search for Higgs boson production in association with a $Z$ boson. [Preview Abstract] |
Saturday, April 22, 2006 11:33AM - 11:45AM |
B13.00005: Measurement of $b$ jet Production in Events with a $Z$ Boson in $p\overline{p}$ Collisions at $\sqrt{s}$ = 1.96 TeV Jonathan Wilson A measurement of the single inclusive bottom jet cross section is presented for events containing a $Z$ boson in $p\overline{p}$ collisions at $\sqrt{s}$ = 1.96 TeV with the Collider Detector at Fermilab. $Z$ bosons are identified in their electron and muon decay modes, and $b$ jets with $E_T$ $>$ 20~GeV and $|\eta| < 1.5$ are identified by reconstructing a secondary decay vertex. The measurement is based on an integrated luminosity of 337 pb$^{-1}$ for the electron decay mode and 324 pb$^{-1}$ for the muon decay mode. We find a cross section of $\sigma$($Z + b$ jet, $Z \rightarrow l^+ l^-$) = 0.96~$\pm$~0.35~pb and the fraction of $b$-jets to the total number of jets in this sample is (2.39 $\pm$ 0.86)\%. This measurement is in agreement with NLO QCD predictions. [Preview Abstract] |
Saturday, April 22, 2006 11:45AM - 11:57AM |
B13.00006: Search for New Physics in the DiElectron Channel at CDF Sam Harper We present a measurement of the Drell-Yan mass spectrum at high energies in the electron channel using 820 inverse picobarns of proton-antiproton collision data taken with the CDF II detector at a centre of mass energy of 1.96 GeV. We examine this mass spectrum for any excesses over Standard Model predictions and also interpret the mass spectrum to provide limits on new neutral massive bosons decaying to two electrons. Examples of such particles include $Z^{\prime}$ bosons resulting from various new physics models and the Randal-Sundrum Graviton. [Preview Abstract] |
Saturday, April 22, 2006 11:57AM - 12:09PM |
B13.00007: Search for Narrow di-Muon Resonances in a Wide Mass Range Michael Schmitt, Jane Nachtman A search for narrow di-muon resonances has been conducted with data collected by the CDF Collaboration. A very wide mass range is examined, extending from the $J/\psi$ resonance to the highest reach of the Tevatron. An innovative statistical treatment is employed allowing a minimal reliance on simulations. Results are interpreted in a model-independent framework allowing limits to be placed on the production of Z$^{\prime}$ resonances of almost any mass. [Preview Abstract] |
Saturday, April 22, 2006 12:09PM - 12:21PM |
B13.00008: Study of Hadronic Final States in Z Production in Searches for Monojet Signatures at the Tevatron Monica D'Onofrio, Oriol Salto We present a comprehensive review of hadronic final states in $Z$ boson production in $\rm p\bar{\rm p}$ collisions at $\sqrt{s} = 1.96$ TeV. The analysis is performed in the context of preliminary studies on irreducible backgrounds in searches for monojet signatures, based on $\sim 1 \ {\rm fb^{-1}}$ of data collected by the CDF experiment in Run 2. [Preview Abstract] |
Saturday, April 22, 2006 12:21PM - 12:33PM |
B13.00009: A Study of Anomalous Production of Z-Bosons with High Transverse Momentum at the Tevatron Alexander Paramonov As part of a broad search for new heavy particles decaying into W and Z bosons, we have measured an upper limit on the anomalous production of Z-bosons with large transverse momentum. The Z bosons, which are produced in $p\bar{p}$ collisions at 1.96 TeV at the Fermilab Tevatron, are studied in the $e^+e^-$ and $\mu^+\mu^-$ final states using the CDF detector. The integrated luminosity of the data samples is 305 $pb^{-1}$. In addition to the comparison with the Standard Model, we have compared the results with the predictions of a specific model, proposed by Bjorken, Pakvasa, and Tuan, of heavy right-handed quarks that decay into the W, Z, and Higgs bosons. [Preview Abstract] |
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