Main Image


A new generation of Lepton Flavour Universality observables from $B\rightarrow$$K^∗$$\mu^+$$\mu^−$

J. Matias, B. Capdevila, S. Descotes-Genon, L. Hofer, J. Virto

in 9th International Workshop on the CKM Unitarity Triangle

Contribution: pdf


The recent years of activity at the LHC have brought to light several anomalies in exclusive semileptonic $b\to s\ell^+\ell^-$ decays that are shortly reviewed here. Our latest global model independent analysis is pointing to sizable New Physics contributions to different Wilson coefficients (especially $C_9$). An accurate analysis of hadronic uncertainties shows that the few attempts in the literature to explain the anomalies using factorizable or non-factorizable power corrections fail. Finally, we propose a new set of observables able to test for lepton-flavour universality violation and free of hadronic uncertainties in the Standard Model. The properties of these observables are analysed within the Standard Model as well as within several New Physics benchmark scenarios.