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Recent B physics anomalies: a ﬁrst hint for compositeness?

We scrutinize the recently further strengthened hints for new physics in semileptonic B -meson decays, focusing on the ‘clean’ ratios of branching fractions R K and R K ∗ and examining to which pattern of new effects they point to. We explore in particular the hardly considered, yet fully viable, option of new physics in the right-handed electron sector and demonstrate how a recently proposed framework of leptons in composite Higgs setups naturally solves both the R K and R K ∗ anomalies via a peculiar structure of new physics effects, predicted by minimality of the model and the scale of neutrino masses. Finally, we also take into account further observables, such as B ( B s → μ + μ − ) , Δ M B s , and angular observables in B → K ∗ μ + μ − decays, to arrive at a comprehensive picture of the model concerning (semilep-tonic) B decays. We conclude that – since it is in good agreement with the experimental situation in ﬂavor physics and also allows to avoid ultra-light top partners – the model furnishes a very promising scenarios of Higgs compositeness in the light of LHC data.