Papers › Status of the B→K^*μ^+μ^- anomaly after Moriond 2017
Status of the B→K^*μ^+μ^- anomaly after Moriond 2017
Wolfgang Altmannshofer, Christoph Niehoff, Peter Stangl, David M. Straub
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Motivated by recent results by the ATLAS and CMS collaborations on the angular distribution of the B →K^* μ^+μ^- decay, we perform a state-of-the-art analysis of rare B meson decays based on the b →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 q² or helicity dependence of the discrepancy. The data can be consistently described by new physics in the form of a four-fermion contact interaction (s̅ γ_α P_L b)(μ̅γ^α μ). 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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