Lepton universality tests with Rare Decays at LHCb

Recent measurements of b-hadron decays involving leptons are in tension with the Standard Model (SM). Each of these so-called flavour anomalies diverge by up to 3 standard deviations from their SM predictions. There are various new physics scenarios (e.g. leptoquarks) which can explain the anomalies in a coherent fashion. Although some tensions could be due to theory uncertainties, certain observables are immune to such ambiguities. Such is the case for branching fraction ratios R(H) = B(Xb→H𝜇+𝜇-)/B(Xb→He+e-), where Xb is a beauty hadron, and H is a hadronic system. This poster presents the latest LHCb results on the ratios R(K) [PRL 122 (2019) 191801], R(K*0) [JHEP 08 (2017) 055], and R(pK) [arXiv:1912.08139].