Relatore
Javier Virto
(Bern)
Descrizione
In the last few years, several interesting anomalies have been observed in B meson decays. First, some branching fractions and angular distributions in b --> s mu mu seem to disagree with current Standard Model predictions. Second, LHCb has reported a measurement of an observable sensitive to lepton-flavor non-universality which is different from zero at the 2.6 sigma level. This observable is a b-->s transition and the deviation is consistent with the anomalies in b --> s mu mu; thus this is very persuasive. Third, there is another hint of lepton-flavor non-universality in charged b --> c semileptonic exclusive transitions, which might be related to the one in b --> s. I will review these B-physics anomalies, paying attention to the theoretical uncertainties in the SM predictions, and to the new physics implications.
