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arXiv 1703.09189hep-phhep-ex
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Morion 2017后$B\to K^*μ^+μ^-$异常的状态

Status of the $B\to K^*μ^+μ^-$ anomaly after Moriond 2017

Wolfgang Altmannshofer, Christoph Niehoff, Peter Stangl, David M. Straub

摘要:

受最近ATLAS和CMS关于$B \to K^* μ^+μ^-$衰变角分布的合作结果的启发,我们基于$b \to s μμ$跃迁对罕见的$B$介子衰变进行了最先进的分析。使用强子不确定性的标准估计,我们确认数据和SM预测之间存在相当大的差异。我们没有发现$q^2$或螺旋度依赖的差异的证据。这些数据可以用新物理学以四费米子接触相互作用$(\bar s γ_αP_L b)(\bar μγ^αμ)$的形式一致地描述。假设新的物理学影响衰变与μ子,但不与电子,我们作出预测的各种理论上干净的观测敏感轻子味普适性的侵犯。

英文摘要:

Motivated by recent results by the ATLAS and CMS collaborations on the angular distribution of the $B \to K^* μ^+μ^-$ decay, we perform a state-of-the-art analysis of rare $B$ meson decays based on the $b \to s μμ$ transition. Using standard estimates of hadronic uncertainties, we confirm the presence of a sizable discrepancy between data and SM predictions. We do not find evidence for a $q^2$ or helicity dependence of the discrepancy. The data can be consistently described by new physics in the form of a four-fermion contact interaction $(\bar s γ_αP_L b)(\bar μγ^αμ)$. Assuming that the new physics affects decays with muons but not with electrons, we make predictions for a variety of theoretically clean observables sensitive to violation of lepton flavour universality.

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