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arXiv 1301.4454hep-exhep-ph
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Generalization of exotic quark searches

F. Garberson, T. Golling

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10 pages, 5 figures, one table
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摘要：

本文给出了质量大于300GeV的奇异重夸克T、B和X的一般极限，并给出了T=>Wb、T=>Zt、T=>Ht、B=>Wt、B=>Zb、B=>Hb和X=>Wt的任意分支分数。结果是基于CMS搜索的最终状态与三个孤立的轻子（电子或μ子）或两个孤立的轻子具有相同的电荷。考虑了通过强相互作用产生的奇异重夸克对。在类矢量夸克模型中，质量mT < 480 GeV和mT < 550 GeV的T夸克分别被排除在弱同位旋单线态和双线态之外，质量mB < 480 GeV的B夸克被排除在单线态之外，所有这些都是在95%的置信水平上。在95%置信水平下，给出了T和B单态、（T，B）二重态和（X，T）二重态的质量极限与相应重夸克质量的函数关系。对于相同质量的mT = mB和mX = mT，在95%的置信水平下，T和B单线态的质量低于550 GeV，（T，B）双线态的质量低于640 GeV，（X，T）双线态的质量低于640 GeV。

英文摘要：

General limits on exotic heavy quarks T, B and X with masses above 300 GeV are presented for arbitrary branching fractions of T=>Wb, T=>Zt, T=>Ht, B=>Wt, B=>Zb, B=>Hb and X=>Wt. The results are based on a CMS search in final states with three isolated leptons (electron or muon) or two isolated leptons with the same electric charge. Exotic heavy quark pair production through the strong interaction is considered. In the context of vector-like quark models, T quarks with a mass mT < 480 GeV and mT < 550 GeV are excluded for weak isospin singlets and doublets, respectively, and B quarks with a mass mB < 480 GeV are excluded for singlets, all at 95% confidence level. Mass limits at 95% confidence level for T and B singlets, (T,B) doublets and (X,T) doublets are presented as a function of the corresponding heavy quark masses. For equal mass mT = mB and mX = mT vector-like quarks are excluded at 95% confidence level with masses below 550 GeV for T and B singlets, 640 GeV for a (T,B) doublet and 640 GeV for a (X,T) doublet.

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