Angular analysis of B → V(→ P1P2) + decays

Abstract

The angular analysis of exclusive rare B-meson decays via intermediate vector mesons V into 4-body final states of two pseudo-scalars P1, P2 and a pair of light leptons ℓ = e, μ offers a large set of observables. They can be used to test the electroweak short-distance couplings in the Standard Model and to search for New Physics. The two kinematic regions of low and high dilepton mass depend on short-distance physics in complementary ways and can be expanded in powers of ΛQCD/mb. These expansions guide towards suitable combinations of observables allowing to i) reduce the hadronic uncertainties in the extraction of the short-distance couplings or ii) test the lattice QCD B → V form factors in short-distance independent combinations. Several such possibilities of CP-averaged and CP-asymmetric (T-even and T-odd) quantities are presented for B̄0d → K̄*0(→ K−π+) + and time-integrated CP-asymmetries without tagging for B̄S, BS → ϕ(→ K−K+) + decays in view of the latest B-factory and CDF results and the forthcoming LHCb measurements.