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arXiv 1808.06261hep-ph
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协变夸克模型中$B_s\to\ell^+\ell^-γ$衰变的研究

Study of $B_s\to\ell^+\ell^-γ$ decays in covariant quark model

Stanislav Dubnička, Anna Z. Dubničková, Mikhail A. Ivanov, Andrej Liptaj, Pietro Santorelli, Chien-Thang Tran

摘要:

本文在标准模型下研究了稀有辐射轻子衰变$B_s\to\ell^+\ell^-γ$($\ell=e,μ,τ$),同时考虑了结构依赖的振幅和韧致辐射.在我们发展的协变约束夸克模型的框架下,计算了双轻子动量平方全运动学区域内表征$B_s\toγ$跃迁的形状因子,并讨论了它们的行为.我们提供的微分衰减分布的解析公式,并给出预测的分支分数在这两种情况下:有和没有长距离的贡献。最后,我们将我们的结果与其他方法中得到的结果进行了比较。

英文摘要:

We study the rare radiative leptonic decays $B_s\to\ell^+\ell^-γ$ ($\ell=e,μ,τ$) within the Standard Model, considering both the structure-dependent amplitude and bremsstrahlung. In the framework of the covariant confined quark model developed by us, we calculate the form factors characterizing the $B_s\toγ$ transition in the full kinematical region of the dilepton momentum squared and discuss their behavior. We provide the analytic formula for the differential decay distribution and give predictions for the branching fractions in both cases: with and without long-distance contributions. Finally, we compare our results with those obtained in other approaches.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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