We calculate bounds for the branching ratio of the Bs0 → τe decay, for the first time, in the context of flavor changing neutral currents mediated by a Z′ gauge boson, which can arise from five extended models. In this sense, by using experimental measurements on the B → Xsγ decay and the Bs0 → μ+μ− process, we look for constraints of the Z′bs coupling, where the more restrictive bound is offered by the last one. On the other hand, by employing the experimental restriction on the τ → eeē decay, the strength of the Z′τe coupling is estimated. Our analysis is based on the more recent experimental results on searches for the Z′ gauge boson in ATLAS and CMS detectors. In addition, we revisited the Bs0 → τμ,μe meson decays by using different approaches not previously reported. The strengths of the Z′τμ and Z′μe couplings were estimated by employing experimental restrictions on the τ → μμμ̄ decay and the μ − e conversion rate, respectively. Thus, we predict the following upper bounds: Bs0 → τe ∼ 10−6, Bs0 → τμ ∼ 10−6 and Bs0 → μe ∼ 10−11.

中文翻译：

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由 Z' 规范玻色子介导的 Bs0 介子衰变为 τe

我们计算分支率的界限乙s0 → τe衰减，第一次，在风味变化的中性电流的背景下，由一种Z'规范玻色子，它可以来自五个扩展模型。从这个意义上说，通过使用实验测量乙 → Xsγ衰变和乙s0 → μ+μ-过程中，我们寻找约束Z'bs耦合，其中更严格的界限由最后一个提供。另一方面，通过对τ → eeē衰败，力量Z'τe耦合估计。我们的分析是基于最近搜索的实验结果Z'在 ATLAS 和 CMS 探测器中测量玻色子。此外，我们重新审视了乙s0 → τμ,μe介子通过使用以前未报道的不同方法衰变。的强项Z'τμ和Z'μe耦合是通过采用实验限制来估计的τ → μμμ̄衰变和μ - e转化率，分别。因此，我们预测以下上限：乙s0 → τe ～ 10-6,乙s0 → τμ ～ 10-6和乙s0 → μe ～ 10-11.