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Summary: The LHCb Collaboration has conducted a new study on B+ -> K+e+e- and B -> K*0e+e- (e = e, mu) decays, testing lepton universality with unprecedented accuracy using all available data. The CMS Collaboration has also improved the analysis of B(d;s) -> mu+mu- branching ratios. Both studies provide insights into new physics, but the global analysis of b -> se+e- transitions relies on assumptions about nonperturbative contributions. This work performs a global Bayesian analysis on (semi)leptonic rare B decays, considering the role of charming penguins that are difficult to evaluate. The data is consistent with the Standard Model, and stringent bounds on lepton universality violation are derived in I Delta BI = I Delta SI = 1 (semi)leptonic processes.
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