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arXiv 0903.2619hep-ph
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顶色辅助人工色模型中的顶夸克衰变t -> cb \bar{b}

Top quark decay t -> cb\bar{b} in topcolor-assisted technicolor models

Guo-Li Liu

摘要:

Topcolor-assisted Technicolor(TC 2)模型预言了与顶夸克有大的变味耦合的顶π介子和CP-甚至顶Higgs粒子的存在,它们在树水平上可以介导顶夸克三体衰变t -> cb \bar{b} .在这项工作中,我们研究这种衰变,显示的相关TC 2参数的衰变率的依赖关系,并比较结果与最小超对称模型的预测。我们发现,在TC 2模型的衰变率是远远大于在最小超对称模型,在很大一部分的参数空间,TC 2的预测可能会达到LHC的可检测水平。

英文摘要:

Topcolor-assisted technicolor (TC2) model predicts the existence of the top-pions and the CP-even top-Higgs with large flavor-changing couplings to the top quark, which at tree-level can mediate the top quark three-body decay t -> cb\bar{b}. In this work we study this decay, showing the dependence of the decay rate on the relevant TC2 parameters and comparing the results with the predictions in the minimal supersymmetric model. We find that the decay rate in the TC2 model is much larger than in the minimal supersymmetric model and, in a large part of the parameter space, the TC2 prediction may reach the detectable level of the LHC.

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