BSM models facing the recent LHCb data: A first look

During the last decade a number of detailed analyses of flavour observables and of their correlations within more than a dozen specific BSM models have been performed at the TUM. One of the goals of these analyses was to investigate which model is capable of obtaining large mixing induced CP asymmetry in the B _s system, S _Ψφ, and to find out what this would imply for other flavour observables. In this context, also the rare decays B _s,d → μ ⁺μ ^- have been considered. In some models, their branching ratios can be enhanced by orders of magnitude above the SM expectations. The recent data on S _Ψφ and B _s,d → μ ⁺μ ^- from the LHCb put an end to these very optimistic hopes modifying significantly the allowed patterns of deviations from SM predictions for flavour observables in concrete BSM models. We make a first semi-quantitative assessment of the most important modifications in the predictions of the BSM models in question including also recently analyzed models and taking into account the most recent lattice input. Our presentation is dominated by quark flavour observables in B _s,d and K ⁺(K ⁰) meson systems. For some BSM models the LHCb data turned out to be a relief. On the other hand, the SM models with CMFV and MFV models without flavour blind phases appear to have significant difficulties in describing all ΔF = 2 observables in B _s,d and K ⁰ meson systems simultaneously. However, definite conclusions will only be possible when |V _ub| and γ will be known from tree level decays with a much better precision and the lattice input will further improve. Finally, we propose to regard the stringent CMFV relations between various observables as standard candles of flavour physics. The pattern of deviations from these relations may help in identifying the correct NP scenario.