#CMSPaper 1267: Other experiments (like LHCb) see #flavourAnomalies differences between leptons in (amongst other) decays of bound particles containing a b quark and other quarks. This paper measures the difference in those decays between decays of B mesons to Kaons and two leptons, R(K). The result is consistent with the standard model and discrepancies both, but with large uncertainties https://arxiv.org/abs/2401.07090
