Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session T8: Electroweak Physics |
Hide Abstracts |
Sponsoring Units: DPF Chair: Jonathan Feng, University of California, Irvine Room: Grand F |
Monday, May 2, 2011 3:30PM - 3:42PM |
T8.00001: Search for diboson production in the lepton plus missing transverse energy plus two $b$-quark jets final state at CDF Marco Trovato Studying diboson production in final states containing a lepton, neutrino, and a pair of $b$-quark jets is important since the event topology is identical to that expected for the associated production of a $W$ boson and a standard model Higgs boson for Higgs masses below 135 GeV/c$^2$. Thus, searches for diboson production in this final state are a preliminary and necessary step towards making a potential Higgs discovery. Here we present a search for $WW$/$WZ$ in events with a lepton, missing transverse energy, and $b$-quark jets. A new multi-variate tagger to distinguish $b$-quark jets from light-quark jets is introduced. Moreover we include events with three or more jets in the final state to our candidate sample to increase the acceptance for signal events. We also describe an new procedure for improved reconstruction the $Z$-invariant mass for events in this sample. [Preview Abstract] |
Monday, May 2, 2011 3:42PM - 3:54PM |
T8.00002: ABSTRACT WITHDRAWN |
Monday, May 2, 2011 3:54PM - 4:06PM |
T8.00003: Measurement of the Standard Model $ZZ$ cross-section and search for heavy Standard Model Higgs in the final state $ZZ\rightarrow llll$ at CDF Tatiana Rodriguez, Elliot Lipeles, Nigel Lockyer We present a measurement of the $ZZ$ cross-section at CDF using $ZZ\rightarrow llll$, expected to be the single most precise measurement of this process at a hadron collider to date. We base our work on the previously published CDF analysis. We expand the lepton categories and significantly improve the acceptance, in addition to benefitting from the increased luminosity. We also extend the scope of this analysis to set a limit on $H\rightarrow ZZ^{*}\rightarrow llll$ in the 140 GeV to 155 GeV mass range, and expect to gather sufficient statistics to compare the kinematic distributions of $ZZ$ to the Standard Model expectations. [Preview Abstract] |
Monday, May 2, 2011 4:06PM - 4:18PM |
T8.00004: Measurement of $W\gamma$ and $Z\gamma$ production at the LHC Alfred Goshaw We present measurements of high energy photons produced in association with W and Z bosons in $pp$ collisions at $\sqrt{s}$ = 7 TeV using the ATLAS detector. The analysis uses W and Z bosons selected with leptonic $e/\mu$ decays. Subsets of these events are identified by demanding an electromagnetic object passing isolated photon selection criteria. Using 35 pb$^{-1}$ of data we isolate signals of $p+p$ $\to l$ + $\nu$ + $\gamma$ + X and $p+p$ $\to l+l$ + $\gamma$ + X production with photon transverse energy $E_T$ $>$ 15 GeV and separation from the lepton $\Delta$R($l$-$\gamma$) $>$ 0.7. The production cross sections and the kinematic distributions of the leptons and photons are compared to Standard Model predictions. [Preview Abstract] |
Monday, May 2, 2011 4:18PM - 4:30PM |
T8.00005: Measurement of the WW Production Cross Section in pp Collisions at 7 TeV with the ATLAS Experiment Yusheng Wu We present the measurement of the W+W- production cross section in proton-proton collisions at 7 TeV in the three di-lepton decay channels (ee, $\mu \mu $ and e$\mu )$ with the ATLAS experiment at the LHC. The data used in this analysis corresponds to an integrated luminosity of 35 pb-1, collected by the ATLAS detector during 2010. This analysis has been focused on the experimental event signature of two isolated leptons with high transverse momenta and large missing transverse energy. The major background for such final states comes from W+jets, Z+jets and top events, which are estimated using both MC samples and data driven methods. Events with jets above 20 GeV are rejected to reduce these backgrounds, resulting in a total background contribution estimated to be less than 20{\%} of the expected WW candidate events. Our observations in the three di-lepton final states are consistent with the SM next-to-leading order predictions of W+W- production. [Preview Abstract] |
Monday, May 2, 2011 4:30PM - 4:42PM |
T8.00006: Study of $Z\gamma$ Helicity Distributions at CMS Irakli Chakaberia Measurement of the production of electroweak gauge bosons ($\gamma$, $W$, $Z$) provides important tests of the standard model. The production of a diboson final state at the Large Hadron Collider (LHC) can occur by quark-antiquark annihilation ($t$-channel) or by boson self-interaction ($s$-channel). The $s$-channel production provides a unique probe of triple gauge boson couplings (TGC) and the effects of new physics on these couplings. I present a study of the helicity angle distributions in the $Z\gamma$ production process at the CMS experiment at the CERN LHC and an examination of the sensitivity of these distributions to new physics. [Preview Abstract] |
Monday, May 2, 2011 4:42PM - 4:54PM |
T8.00007: Measurement of Associated $WW$ and $WZ$ Production in lepton+jets Final States in ppbar Collisions at $\sqrt{s}=1.96$ TeV Joe Haley We present a measurement of associated $WW$ and $WZ$ diboson produced at a center-of-mass energy of $\sqrt{s}=$1.96~TeV with the D0 detector at the Fermilab Tevatron collider. The search is performed in events containing one lepton (electron or muon), an imbalance in the transverse energy, and two or more jets with 5.3~fb$^{-1}$ of data. The separation of signal and background events was done using a Random Forest classifier. This analysis provides a proving ground for the analogous low mass Higgs boson searches at the Tevatron. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700