/ Experiment-HEP arXiv:0912.1057

Search for New Bottomlike Quark Pair Decays Q Q-bar ---> (t W-+) (t-bar W+-) in Same-Charge Dilepton Events

Published in: Phys.Rev.Lett.
Year: 2010
Vol.: 104
Page No: 091801
Pages: 7

Abstract: We report the most restrictive direct limits on masses of fourth-generation down-type quarks $b^{\prime}$, and quark-like composite fermions ($B$ or $T_{5/3}$), decaying promptly to $t W^{\mp}$. We search for a significant excess of events with two same-charge leptons ($e$, $\mu$), several hadronic jets, and missing transverse energy. An analysis of data from $p\overline{p}$ collisions with an integrated luminosity of 2.7 fb$^{-1}$ collected with the CDF II detector at Fermilab yields no evidence for such a signal, setting mass limits $m_{b^{\prime}}, m_{B} >$ 338 $\mathrm{GeV}/c^2$ and $m_{T_{5/3}} >$ 365 $\mathrm{GeV}/c^2$ at 95% confidence level.

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