Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session H9: Electroweak Physics at the Energy Frontier |
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Sponsoring Units: DPF Chair: Chip Brock, Michigan State University Room: Maryland A |
Sunday, February 14, 2010 10:45AM - 10:57AM |
H9.00001: Cross Section Measurement for $Z(\gamma) \rightarrow \mu\mu\gamma$ in $p\bar{p}$ Collisions at the Tevatron Andrew Kobach The Standard Model describes the electroweak interaction by the non-abelian gauge group $SU(2) \otimes U(1)$, and under symmetry transformations, the electroweak gauge bosons ($Z$, $W^{\pm}$, $\gamma$) can self-interact, however in the Standard Model, a $Z(\gamma)$ coupling is not permitted. Using data collected since July 2006, $Z(\gamma) \rightarrow \mu\mu\gamma$ events were studied using the Run IIb D$\O$ detector at the Tevatron. Topologically permitted Standard Model $\mu\mu\gamma$ events include initial radiation of a photon by a quark and a subsequent decay of a $Z$ to two muons, or where one of the leptons from the $Z$ radiates a hard photon. If the measured cross-section of $Z(\gamma) \rightarrow \mu\mu\gamma$ is significantly different compared to the the theoretical prediction, this is strong evidence for new physics associated with $Z(\gamma)$ coupling. Using the largest dataset to date for such a measurement, this work in progress will culminate in an observation in new physics or will set the tightest limits on anomalous gauge couplings in the world. [Preview Abstract] |
Sunday, February 14, 2010 10:57AM - 11:09AM |
H9.00002: Studies of Z + photon production at CDF Jake Whitaker, John Freeman, Vadim Rusu, Young-Kee Kim We present studies of $Z \rightarrow l^{+} l^{-} + $ photon production with central photons where the Z decays into $e^{+}e^{-}$ or $\mu^{+}\mu^{-}$, using 4.5 fb$^{-1}$ of Tevatron $p \bar{p}$ collisions collected by the CDF detector at Fermilab. We measure the cross section for $Z \rightarrow l^{+} l^{-} + $ photon where the invariant mass of the two leptons is greater than 40 GeV and the photon, separated from both leptons, has transverse energy greater than 7 GeV. We then compare it to the next-to-leading-order calculation. We also present kinematic distributions of data events and compare them with the expected shapes from the standard model, with the specific goal of measuring potential beyond-the-standard-model anomalous triple gauge couplings between the $Z$ and the photon. [Preview Abstract] |
Sunday, February 14, 2010 11:09AM - 11:21AM |
H9.00003: Studies of initial state gluon radiation in Drell-Yan events at the LHC K. Yamamoto Initial State Radiation (ISR) primarily consists of gluons radiated before the hard interaction. The uncertainty in the model of ISR in the Monte Carlo simulation is a source of systematic uncertainty for many measurements at the LHC. In order to study ISR, Drell-Yan events are suitable because the Drell-Yan process has a leptonic final state that is not sensitive to final state gluon radiation. We present a method to determine systematic uncertainties due to ISR by comparison of Monte Carlo simulated Drell-Yan events to future data, expected from the initial run of the ATLAS experiment in 2010. [Preview Abstract] |
Sunday, February 14, 2010 11:21AM - 11:33AM |
H9.00004: Drell-Yan cross section measurement Alexey Svyatkovskiy, Hwidong Yoo, Norbert Neumeister We present preliminary results of the measurement of the Drell-Yan muon pair production cross section in pp collisions with the first data collected by the CMS detector at the LHC. Dedicated methods to determine trigger and reconstruction efficiencies, using a data-driven approach, will be presented. Methods to correct for the limited detector resolution will be discussed. The Drell-Yan muon pair production cross section is reported relative to the $Z \to \mu\mu$ peak cross section to avoid large systematic uncertainties, and was also compared with NNLO theoretical predictions. [Preview Abstract] |
Sunday, February 14, 2010 11:33AM - 11:45AM |
H9.00005: ABSTRACT WITHDRAWN |
Sunday, February 14, 2010 11:45AM - 11:57AM |
H9.00006: Measurement of $WZ$ cross section at D0 Carrie McGivern Measurements of the WZ diboson cross section are interesting both as a test of the Standard Model and as a potential indicator of new physics. We present a measurement of the WZ cross section using the fully leptonic decay mode of $lll\nu$ final states in $p-\overline{p}$ collisions at $\sqrt{s}$ = 1.96 TeV with 5 fb$^{-1}$ of data taken at the D{\O} experiment at the Tevatron. This measurement includes, for the first time, the ICR (Inter-Crytostat Region) for the electron acceptance. [Preview Abstract] |
Sunday, February 14, 2010 11:57AM - 12:09PM |
H9.00007: Search for Anomalous $WWZ$ and $WW\gamma$ Triple Gauge Couplings Rami Vanguri Limits on $WW\gamma$ and $WWZ$ anomalous triple gauge couplings are set using $WW$ production at the Fermilab Tevatron in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV using the CDF II detector. Fitting the leading lepton $p_T$ distribution from $WW\rightarrow l\nu l\nu$ lets us place 95\% confidence level limits. Since $WW$ production can involve a $Z$ or $\gamma$ propagator in the s-channel of production, the HISZ parametrization is used to make 3 independent parameters ($\lambda^{Z}, \Delta g_{1}^{Z}, \Delta \kappa^{\gamma}$). A fit is done to each parameter independently while the other 2 are set to the Standard Model value. [Preview Abstract] |
Sunday, February 14, 2010 12:09PM - 12:21PM |
H9.00008: Study of WW and WZ Productions at LHC with ATLAS Xuefei Li We report studies of the Standard Model WW and WZ diboson productions at LHC with the ATLAS detector using fully simulated Monte Carlo events. The cross section measurement uncertainties for the Standard Model WW and WZ productions are estimated through the diboson leptonic decay channels at center-of-mass energy of 10 TeV for the first year of LHC data. The detection sensitivities of the anomalous triple-gauge-boson couplings from the diboson final states are investigated using the diboson Monte Carlo events produced at 14 TeV. The application of the advanced technique, the Boosted Decision Trees, in diboson physics analysis is also presented. [Preview Abstract] |
Sunday, February 14, 2010 12:21PM - 12:33PM |
H9.00009: Search for Rare Radiative Decay $W\rightarrow\pi\gamma$ in ppbar Collisions at $\sqrt{s} = 1.96$ TeV Christopher Lester, Pavel Murat, Thomas Phillips, Al Goshaw, Andrea Bocci We present a search for the rare radiative decay $W\rightarrow\pi\gamma$ using 4.3$fb^{-1}$ of data collected from proton-anti proton collisions at $\sqrt{s} = 1.96$ TeV by the CDF experiment at Fermilab. As no signal is observed, we set a 95\% CL upper limit on the relative branching fraction bratio at $6.4\times 10^{-5}$, a factor of 10 improvement over the existing limit. [Preview Abstract] |
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