We report the most restrictive direct limits on masses of fourth-generation down-type quarks b', and quark-like composite fermions (B or T_5/3), decaying promptly to t W-/+. 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 anti-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', m_B > 338 GeV/c2 and m_T_5/3 > 365 GeV/c2 at 95% confidence level.
Search for New Bottomlike Quark Pair Decays QQ- --> (t W-/+)(t-bar W+/-) in Same-Charge Dilepton Events
CASTRO, ANDREA;DENINNO, MARIA MADDALENA;MARGAROLI, FABRIZIO;MAZZANTI, PAOLO;MOGGI, NICCOLO';MUSSINI, MANUEL;RIMONDI, FRANCO;ZUCCHELLI, STEFANO
2010
Abstract
We report the most restrictive direct limits on masses of fourth-generation down-type quarks b', and quark-like composite fermions (B or T_5/3), decaying promptly to t W-/+. 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 anti-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', m_B > 338 GeV/c2 and m_T_5/3 > 365 GeV/c2 at 95% confidence level.File in questo prodotto:
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