New physics in rare B decays after Moriond 2021

The anomalies in rare B decays endure. We present results of an updated global analysis that takes into account the latest experimental input - in particular the recent results on RK and BR(B-s -> mu(+)mu(-)) - and that qualitatively improves the treatment of theory uncertainties. Fit results are presented for theWilson coefficients of four-fermion contact interactions. We find that muon specific Wilson coefficients C-9 similar or equal to -0.73 or C-9 = C-10 similar or equal to -0.39 continue to give an excellent description of the data. If only theoretically clean observables are considered, muon specific C-10 similar or equal to 0.60 or C-9 = -C10 similar or equal to -0.35 improve over the Standard Model by root Delta chi(2) similar or equal to 4.7s and root Delta chi(2) similar or equal to 4.6 sigma, respectively. In various new physics scenarios we provide predictions for lepton flavor universality observables and CP asymmetries that can be tested with more data. We update our previous combination of ATLAS, CMS, and LHCb data on BR(B-s -> mu(+)mu(-)) and BR(B-0 -> mu(+) mu(-)) taking into account the full twodimensional non-Gaussian experimental likelihoods.

Automated summary

The anomalies in rare B decays persist, with specific Wilson coefficients related to muons continuing to provide an excellent description of the data. Updated global analysis considers latest experimental input and offers predictions for lepton flavor universality observables and CP asymmetries that can be tested with more data.