Search for New Bottomlike Quark Pair Decays Q(Q)over-bar -> (tW +/-)((t)over-barW +/- in Same-Charge Dileption Events

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doi:10.1103/PhysRevLett.104.091801

We report the most restrictive direct limits on masses of fourth-generation down-type quarks 𝑏′ , and quarklike composite fermions (𝐵 or 𝑇5/3 ), decaying promptly to 𝑡⁢𝑊∓ . We search for a significant excess of events with two same-charge leptons (𝑒 , 𝜇 ), several hadronic jets, and missing transverse energy. An analysis of data from 𝑝⁢ ‾‾‾ 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 𝑚𝑏′ , 𝑚𝐵 >338 GeV/𝑐2 and 𝑚𝑇5/3 >365 GeV/𝑐2 at 95% confidence level.

Search for New Bottomlike Quark Pair Decays Q(Q)over-bar -> (tW +/-)((t)over-barW +/- in Same-Charge Dileption Events / Aaltonen T, Adelman J, Gonzalez BA, Amerio S, Amidei D, Anastassov A, Annovi A, Antos J, Apollinari G, Apresyan A, Arisawa T, Artikov A, Asaadi J, Ashmanskas W, Attal A, Aurisano A, Azfar F, Badgett W, Barbaro-Galtieri A, Barnes VE, et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - ELETTRONICO. - 104:(2010), pp. 0-0. [10.1103/PhysRevLett.104.091801]