Status of the $B\rightarrow K^*\mu ^+\mu ^-$ anomaly after Moriond 2017
2017
Motivated by recent results by the ATLAS and CMS collaborations on the angular distribution of the $$B \rightarrow K^* \mu ^+\mu ^-$$
decay, we perform a state-of-the-art analysis of rare B meson decays based on the $$b \rightarrow s \mu \mu $$
transition. Using standard estimates of hadronic uncertainties, we confirm the presence of a sizeable 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 $$(\bar{s} \gamma _\alpha P_L b)(\bar{\mu }\gamma ^\alpha \mu )$$
. 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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