Assessing lepton-flavour non-universality from B → K*ℓℓ angular analyses

The recent years of activity at the LHC have brought to light several anomalies in exclusive semileptonic b → sℓ+ℓ− decays. Even though the latest model independent analyses are pointing to sizable New Physics contributions to different Wilson coefficients (especially C9), the possibility of interpreting these results unambiguously in terms of New Physics is spoilt by non-perturbative QCD corrections entering at amplitude level. In this proceeding, we present a brief summary of the latest results of our global fits. Also, the origin of the above mentioned QCD corrections, plus their interplay with possible New Physics contributions, is shortly reviewed. A discussion about the properties of the observable RK leads to the central part of this work: the proposal of a new set of observables able to test for lepton-flavour universality violation, where hadronic uncertainties cancel (in the Standard Model). To conclude, the properties of these observables are analysed within the Standard Model as well as within several New Physics benchmark scenarios.

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