Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session P13: Particle Searches I |
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Sponsoring Units: DPF Chair: Vladimir Litvin, California Institute of Technology Room: Hyatt Regency Dallas Cumberland G |
Monday, April 24, 2006 10:45AM - 10:57AM |
P13.00001: Search for Gluino and Squark Production in Mutijets plus Missing Transverse Energy Final States at the Tevatron Xavier Portell, Carlos Sanchez We present results on a search for squarks and gluinos in proton-antiproton collisions with a center-of-mass energy of 1.96 TeV, based on 371 pb$^{-1}$ of data collected by the CDF detector during Run II. Events with multiple jets and large missing energy in the final state are studied within the framework of minimal supergravity and assuming R-parity conservation. No excess with respect to the Standard Model predictions is observed and new limits on the gluino and squark masses are extracted. [Preview Abstract] |
Monday, April 24, 2006 10:57AM - 11:09AM |
P13.00002: Search for the Associated Production of Charginos and Neutralinos with the D\O\ detector Olav Mundal A search for associated production of charginos and neutralinos is performed using data recorded with the D\O\ detector at a $p\bar p$ center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. This analysis considers final states with missing transverse energy and three leptons, including hadronic decays of tau leptons. With a dataset corresponding to an integrated luminosity of about 1 ${\rm fb}^{-1}$, the analysis is probing chargino masses beyond existing limits from LEP and previous Tevatron Run II analyses. [Preview Abstract] |
Monday, April 24, 2006 11:09AM - 11:21AM |
P13.00003: Limit on the Associated Production of Charginos and Neutralinos in ppbar collisions at $\sqrt{s}=1.96$ TeV Sourabh Dube, John Zhou, Sunil Somalwar, Giulia Manca, Beate Heinemann, Martin Griffiths, Anadi Canepa, Else Lytken, Vladimir Rekovic, John Strologas, Michael Gold We search for the associated production of charginos and neutralions in ppbar collisions at $\sqrt{s}=1.96$ TeV measured with the CDF experiment at the Fermilab Tevatron. The results are obtained from high-pt and medium-pt lepton triggers, using channels with three leptons and two like-sign leptons, with $\sim$350 pb$^{-1}$ of data. Limits on the production time branching ratio as well as excluded region in the minimal supergravity SUSY framework are presented. [Preview Abstract] |
Monday, April 24, 2006 11:21AM - 11:33AM |
P13.00004: Search for Chargino-Neutralino Production with Low Pt Electrons Sourabh Dube, John Zhou, Sunil Somalwar We present a search for associated production of Chargino-Neutralino decaying to three leptons, with approximately 700 pb$^{-1}$ of p-pbar collision data at $\sqrt{s}=1.96$ TeV, collected with the CDF Run2 detector. The search is performed in the framework of mSUGRA. Two of the three leptons in the final state must be electrons and the third object is a track making the analysis sensitive to tau channels. Major backgrounds are identified and calculated. Preliminary results in the form of production cross section limit are presented. [Preview Abstract] |
Monday, April 24, 2006 11:33AM - 11:45AM |
P13.00005: Search for SUSY at Tevatron Run II from Chargino-Neutralino Production in Low Pt Di-muon Channel Vladimir Rekovic, John Strologas, Michael Gold Minimal Supersymetric Standard Model(MSSM) predicts the production of tri-lepton events at the Tevatron via chargino-neutralino production. We will present our sensitivity to discovery of this production in low Pt di-muon channel. We use the data set with some 800 pb$^{-1}$ of data taken by the CDF-II detector during Run II of the Tevatron, which is about eight times the data collected in Run I of Tevatron. [Preview Abstract] |
Monday, April 24, 2006 11:45AM - 11:57AM |
P13.00006: Sensitivity for the Discovery of Supersymmetry in the Leptons plus Jets Yuriy Pakhotin, B. Scurlock Preparations are underway to search for possible signatures of Supersymmetry (SUSY) in the inclusive leptons plus jets and missing transverse energy (MET) as well as semi-inclusive topologies involving same-sign dimuon final states, using the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider. This talk reports on the expected performance of CMS, using a full simulation of the detector, and studies its effect on SUSY discovery potential. The primary background sources to SUSY are expected to arise from QCD mulitjets, top anti-top, and W/Z production. Strategies for reducing this background, both from the online CMS trigger and from offline data analysis, as well as understanding and controlling systematic uncertainties, are presented. [Preview Abstract] |
Monday, April 24, 2006 11:57AM - 12:09PM |
P13.00007: Search for Pair Production of Scalar Top Quarks Each Decaying to a $\tau$ Lepton and a $b$ Quark in 1.96-TeV $p\bar{p}$ Collisions Vadim Khotilovich We present the results of a search for pair production of scalar top quarks ($\tilde{t}_{1}$) in an {\it R}-parity violating supersymmetry scenario, in 322 pb$^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV, collected by the Collider Detector at Fermilab (CDF). We assume each stop quark always decays into a $\tau$ lepton and a $b$ quark, and that the final state is either an electron or a muon from the leptonic $\tau$ decay, a hadronically decaying $\tau$ lepton, and two or more jets. Two candidate events pass our final selection criteria, consistent with the expectation from standard model sources. We set a 95\% confidence level limit $m(\tilde{t}_{1}) > 151$ GeV comparing with the next-to-leading order cross section. This limit is also fully applicable to the case of the third generation scalar leptoquark ($LQ_3$) assuming a 100\% branching ratio for the $LQ_3 \to \tau b$ decay mode. [Preview Abstract] |
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