Towards establishing lepton flavor universality violation in B → K ∗ decays TOWARDS ESTABLISHING LEPTON FLAVOR ... ANDREA MAURI, NICOLA SERRA, and RAFAEL SILVA COUTINHO

Rare semileptonic b→s transitions provide some of the most promising frameworks to search for new physics effects. Recent analyses of these decays have indicated an anomalous behavior in measurements of angular distributions of the decay B0→K∗μ+μ- and lepton-flavor-universality observables. Unambiguously establishing if these deviations have a common nature is of paramount importance in order to understand the observed pattern. We propose a novel approach to independently and complementary probe this hypothesis by performing a simultaneous amplitude analysis of B0→K̄∗0μ+μ- and B0→K̄∗0e+e- decays. This method enables the direct determination of observables that encode potential non-equal couplings of muons and electrons, and are found to be insensitive to nonperturbative QCD effects. If current hints of new physics are confirmed, our approach could allow an early discovery of physics beyond the standard model with LHCb run II data sets.