We discuss the status of $b\to s{\ell }^{+}{\ell }^{-}$ decays in the post-$R_{K^{(*)}}$ era. The recent LHCb update of $R_K$ and $R_{K^{*}}$ measurements, which are now compatible with the Standard Model, constrain new physics contributions to be lepton-flavor universal, allowing only small deviations from this limit. In addition to the latest LHCb measurements of $R_K$ and $R_{K^{*}}$, we also include the recent CMS measurements of $R_K$ and of the branching ratio of $B^{+}\to K^{+}{\mu }^{+}{\mu }^{-}$. We present a model-independent analysis of the $b\to s{\ell }^{+}{\ell }^{-}$ data and investigate the implications of the different sets of observables. In addition, we consider multidimensional fits and discuss the significance of more complex new physics scenarios compared to one- and two-dimensional scenarios.

• Received 17 October 2023
• Accepted 4 December 2023

DOI:https://doi.org/10.1103/PhysRevD.108.115037

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society