Orateur
Description
Deviations from the Standard Model have long been observed in semileptonic B-meson decays, notably b→ sll transitions, triggering speculations on potential New Physics effects in this sector. After the recent update of RK(*) and BR(B(s) → μμ) by the LHCb collaboration, the remaining significant deviations from the SM in FCNC B decays are found in the branching ratios of mesonic decays involving b → sμμ and in the angular observable P’5.
Unlike RK(*) and BR(B(s) → μμ), the observables BR(B(s) → Mμμ) (M = K(),φ,…) are theoretically challenging to predict accurately because of their high sensitivity to non-perturbative QCD contributions, both local and non-local. These contributions yield a theoretical error of order 30%, which can be as large as (sometimes larger than) the experimental uncertainty, and clearly hamper the potential of these observables for discovery.
I will discuss the current state of B-meson anomalies, and the impact of transition form factors when considering the tension of experimental data with respect to the Standard Model.
