Rare decays, mediated by flavour-changing neutral currents (FCNCs), are highly suppressed in the standard model (SM) and are consequently sensitive probes of physics beyond the SM. The LHCb experiment has produced a broad range of rare decays measurements, setting important constraints on new physics (NP). These proceedings summarise three recent representative results: a comprehensive analysis of the decay B⁰ K^*0^+^- which reinforces existing tensions with SM predictions in both branching fractions and angular observables, a search for the lepton flavour violating (LFV) decay B⁰ K^*0^ e^ setting the most stringent limits to date on b s e transitions, and a test of lepton flavour universality (LFU) using Bₛ⁰ ^+^- decays which is the first LFU test with rare Bₛ⁰ decays and includes the first observation of Bₛ⁰ e^+e^-. These analyses demonstrate the precision and reach of the LHCb rare decays programme which is setting increasingly stringent limits on NP.
Thomas Long (Fri,) studied this question.