B → K2∗ (1430)+- distributions at large recoil in the Standard Model and beyond

We study the rare decay B→K2∗(1430)(→Kπ)+- in the Standard Model and beyond. Working in the transversity basis, we exploit the relations between the heavy-to-light form factors in the limit of heavy quark (mb→∞) and large energy (EK2∗→∞) of the K2∗ meson. This allows us to construct observables where, at leading order in ΛQCD/mb and αs, the form-factor dependence involving the B→K2∗ transitions cancels. Higher-order corrections are systematically incorporated in the numerical analysis. In the Standard Model, the decay has a sizable branching ratio, and therefore a large number of events can be expected at LHCb. Going beyond the Standard Model, we explore the implications of the global fit to presently available b→s+- data on the B→K2∗+- observables.