Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session B9: Searches for Exotic Particles I |
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Sponsoring Units: DPF Chair: Janet Conrad, Columbia University Room: Marriott Tampa Waterside Room 5 |
Saturday, April 16, 2005 10:45AM - 10:57AM |
B9.00001: Search for Scalar and Vector Third Generation Leptoquarks with one $\tau$ Decaying to a Muon Stan Forrester At Run II of the Fermilab Tevatron, the CDF experiment provides good sensitivity for either discovery or setting limits on 3rd generation scalar and vector leptoquark ($LQ_3$) pair-production, where each leptoquark decays $LQ_3 \to \tau b$. The estimated cross section at the Tevatron for this process is 1 pb for scalar (vector) $LQ_3$ masses of 135 ($\sim$200, depending on coupling) GeV/c$^2$. We perform a search for such production in the $(\tau \to \mu) + \tau_h$ channel using about 400 pb$^{-1}$ of data taken at $\sqrt{s}$ = 1.96 TeV. [Preview Abstract] |
Saturday, April 16, 2005 10:57AM - 11:09AM |
B9.00002: Search for Scalar and Vector Third Generation Leptoquarks with one $\tau$ Decaying to an Electron Takashi Akimoto At Run II of the Fermilab Tevatron, the CDF experiment provides good sensitivity for either discovery or setting limits on 3rd generation scalar and vector leptoquark ($LQ_3$) pair-production, where each leptoquark decays $LQ_3 \to \tau b$. The estimated cross section at the Tevatron for this process is 1 pb for scalar (vector) $LQ_3$ masses of 135 ($\sim$200, depending on coupling) GeV/c$^2$. We perform a search for such production in the $(\tau \to e) + \tau_h$ channel using about 400 pb$^{-1}$ of data taken at $\sqrt{s}$ = 1.96 TeV. [Preview Abstract] |
Saturday, April 16, 2005 11:09AM - 11:21AM |
B9.00003: Search for Second Generation Leptoquarks Xiaofei Song Leptoquarks are hypothesized particles that appear in many extensions of the Standard Model. At the Fermilab Tevatron, they would mainly be pair-produced and decay to a lepton and a quark. In principle, although leptoquarks could decay into any combination of a lepton and a quark, indirect experimental limits lead to the assumption that there would be three generations, each coupling to quarks and leptons within the same generation. The analysis presented here is a search for second generation leptoquarks in the dimuon channel, based on about 350 pb$^{-1}$ of integrated luminosity collected in Run II. The dominant backgrounds consist of Drell-Yan process and top pair production. The data are consistent with Standard Model backgrounds and no evidence of leptoquark production is found. Improved lower limits on the leptoquark mass have been derived. [Preview Abstract] |
Saturday, April 16, 2005 11:21AM - 11:33AM |
B9.00004: Search for third generation leptoquarks with the D\O\ detector Sergey Uzunian Leptoquarks are exotic particles that carry color, electric charge, and lepton number, which appear for example in extended gauge theories and composite models. It is expected that leptoquarks come in three generations, corresponding to the usual three quark and lepton families. A search for charge 1/3 third-generation leptoquarks pair-produced in $p\bar p$ collisions at $\sqrt{s}=1.96$ TeV has been performed in data collected by the D\O\ detector at the Fermilab Tevatron. Such leptoquarks would decay either into a tau-neutrino and a b-quark or, if heavy enough, into a tau-lepton and a t-quark. Preliminary results are reported for the case where both leptoquarks decay into neutrinos, which leads to a final state consisting of two b-quarks with missing transverse energy. [Preview Abstract] |
Saturday, April 16, 2005 11:33AM - 11:45AM |
B9.00005: Search for a heavy fourth generation $t\prime$\ quark in Lepton plus Jets channel at CDF Eric Cochran We present a search for a heavy $t^\prime$\ quark decaying to $Wq$\ final states in $p\bar{p}$\ collisions at $\sqrt{s}$ = 1.96 TeV, using 340 pb$^{-1}$\ of data collected by the CDFII detector at the Fermilab Tevatron. We select events with a high transverse momentum electron or muon, 4 or more jets, and missing $E_T$. We use the observed total transverse energy ($H_T$) spectrum and an artificial neural network to discriminate the $t^\prime$\ signal from background, and obtain limits on a $t^\prime$\ cross section as a function of hypothetical $t^\prime$\ mass. In addition to the status of the current search, we will present the prospects for the future. [Preview Abstract] |
Saturday, April 16, 2005 11:45AM - 11:57AM |
B9.00006: Search for long lived neutral particles with the D\O\ detector Todd Adams The large luminosity sample of more than 400 pb$^{-1}$ accumulated by the D\O\ experiment at the Tevatron enables searches for new physics which have not previously been possible at hadron colliders. We present a search for a relatively long-lived neutral particle produced in $p \bar p$ collisions at 1.96 TeV. This analysis has been optimized for particles decaying into two muons, significantly away from the interaction point but still within the inner portion of the detector. This search begins to probe the excess of such events seen in the NuTeV experiment, as well as to explore the parameter space of supersymmetry with a small R-parity violating coupling. [Preview Abstract] |
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