LAUSR

A bstractThe anomalies in the measurements of observables involving b → sμμ decays, namely RK, RK*, P5′, and Bsϕ, may be addressed by adding lepton-universality-violating new physics contributions to the effective operators O9,O10,O9′,O10′$$ {\mathcal{O}}_{\mathcal{9}},{\mathcal{O}}_{10},{\mathcal{O}}_9^{\prime },{\mathcal{O}}_{10}^{\prime } $$. We analyze all the scenarios where the new physics contributes to a pair of these operators at a time. We perform a global fit to all relevant data in the b → s sector to estimate the corresponding new Wilson coefficients, O9NP,O10NP,O9′,O10′$$ {\mathcal{O}}_9^{\mathrm{NP}},{\mathcal{O}}_{10}^{\mathrm{NP}},{\mathcal{O}}_9^{\prime },{\mathcal{O}}_{10}^{\prime } $$. In the light of the new data on RK, and RK*, presented in Moriond 2019, we find that the scenarios with new physics contributions to the O9NPO9′$$ \left({\mathcal{O}}_9^{\mathrm{NP}},{\mathcal{O}}_9^{\prime}\right) $$ or O9NPO10′$$ \left({\mathcal{O}}_9^{\mathrm{NP}},{\mathcal{O}}_{10}^{\prime}\right) $$ pair remain the most favored ones. On the other hand, though the competing scenario O9NPO10NP$$ \left({\mathcal{O}}_9^{\mathrm{NP}},{\mathcal{O}}_{10}^{\mathrm{NP}}\right) $$ remains attractive, its advantage above the SM reduces significantly due to the tension that emerges between the RK and RK* measurements with the new data. The movement of the RK measurement towards unity would also result in the re-emergence of the one-parameter scenario C9NP = − C9′.