Abstract
The anomalies in the measurements of observables involving b → sμμ decays, namely RK, RK*, P ′5 , and B ϕ s , may be addressed by adding lepton-universality-violating new physics contributions to the effective operators \( {\mathcal{O}}_{\mathcal{9}},{\mathcal{O}}_{10},{\mathcal{O}}_9^{\prime },{\mathcal{O}}_{10}^{\prime } \). 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, \( {\mathcal{O}}_9^{\mathrm{NP}},{\mathcal{O}}_{10}^{\mathrm{NP}},{\mathcal{O}}_9^{\prime },{\mathcal{O}}_{10}^{\prime } \). 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 \( \left({\mathcal{O}}_9^{\mathrm{NP}},{\mathcal{O}}_9^{\prime}\right) \) or \( \left({\mathcal{O}}_9^{\mathrm{NP}},{\mathcal{O}}_{10}^{\prime}\right) \) pair remain the most favored ones. On the other hand, though the competing scenario \( \left({\mathcal{O}}_9^{\mathrm{NP}},{\mathcal{O}}_{10}^{\mathrm{NP}}\right) \) 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 C NP9 = − C ′9 .
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Alok, A.K., Dighe, A., Gangal, S. et al. Continuing search for new physics in b → sμμ decays: two operators at a time. J. High Energ. Phys. 2019, 89 (2019). https://doi.org/10.1007/JHEP06(2019)089
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DOI: https://doi.org/10.1007/JHEP06(2019)089