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arXiv 1209.1987hep-ph
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具有Z-介导味改变中性电流的模型中的b -> s衰变

b -> s Decays in a model with Z-mediated flavor changing neutral current

Ashutosh Kumar Alok, Shireen Gangal

摘要:

在与Z介导的味道改变中性电流发生在树级由于添加一个矢量状的等单线态下型夸克d'的SM粒子谱的情况下,我们执行卡方拟合使用的味道物理数据,并获得最佳的拟合值以及树级Zbs耦合的误差,U_{sb}。拟合表明,新的物理耦合被约束为小:我们得到|U_{sb}| 3 σ时<= 3.40 X 10^{-4}。尽管如此,这确实允许新的物理信号的可能性,在一些可观察到的,如半轻子CP不对称的Bs衰变。

英文摘要:

In the scenario with Z mediated flavor changing neutral current occurring at the tree level due to the addition of a vector-like isosinglet down-type quark d' to the SM particle spectrum, we perform a chi square fit using the flavor physics data and obtain the best fit value along with errors of the tree level Zbs coupling, U_{sb}. The fit indicates that the new physics coupling is constrained to be small: we obtain |U_{sb}| <= 3.40 X 10^{-4} at 3 sigma. Still this does allow for the possibility of new physics signals in some of the observables such as semileptonic CP asymmetry in Bs decays.

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