论文标题
对Lepton普遍性违反稀有$ B $衰减的限制
Constraints on Lepton Universality Violation from Rare $B$ Decays
论文作者
论文摘要
The LHCb collaboration has very recently released a new study of $B^+ \to K^{+} \ell^+ \ell^-$ and $B \to K^{*0} \ell^+ \ell^-$ ($\ell = e,μ$) decays, testing lepton universality with unprecedented accuracy using the whole Run 1 and 2 dataset.此外，CMS协作最近报告了对分支比率$ b _ {（d，s）} \toμ^+μ^ - $的改进分析。尽管这些测量值提供了对新物理学的有力探测本身，但全局分析$ b \ to s \ ell^+ \ ell^ - $ transitions也依赖于对衰减矩阵元素的非扰动贡献的假设。在这项工作中，我们在（半）松性稀有$ B $衰减中对新物理学进行了全球贝叶斯分析，关注迷人的企鹅的作用，这些企鹅的作用很难从第一原则中评估。我们发现，一旦包括从中间的耐药状态进行撤下的标准模型，我们发现数据与标准模型一致。因此，我们在$ |ΔB中对违反Lepton普遍性的严格界限| = | ΔS| = 1 $（半）leptonic过程。
The LHCb collaboration has very recently released a new study of $B^+ \to K^{+} \ell^+ \ell^-$ and $B \to K^{*0} \ell^+ \ell^-$ ($\ell = e,μ$) decays, testing lepton universality with unprecedented accuracy using the whole Run 1 and 2 dataset. In addition, the CMS collaboration has recently reported an improved analysis of the branching ratios $B_{(d,s)}\toμ^+μ^-$. While these measurements offer, per se, a powerful probe of New Physics, global analyses of $b \to s \ell^+ \ell^-$ transitions also rely on the assumptions about nonperturbative contributions to the decay matrix elements. In this work, we perform a global Bayesian analysis of New Physics in (semi)leptonic rare $B$ decays, paying attention to the role of charming penguins which are difficult to evaluate from first principles. We find data to be consistent with the Standard Model once rescattering from intermediate hadronic states is included. Consequently, we derive stringent bounds on lepton universality violation in $|ΔB | = | ΔS| = 1$ (semi)leptonic processes.
