Some results on lepton flavour universality violation

Motivated by recent experimental measurements on flavour physics, in tension with Standard Model predictions, we perform an updated analysis of new physics violating lepton flavour universality, by using the effective Lagrangian approach and in the Z′ and S3 leptoquark models. We explicitly analyze the impact of considering complex Wilson coefficients in the analysis of B-anomalies, by performing a global fit of RK and RK∗0 observables, together with ΔMs and ACPmix. The inclusion of complex couplings provides a slightly improved global fit, and a marginally improved ΔMs prediction.