Angular analysis of B --> V (--> P1 P2) l+ l- 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, mu 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 LambdaQCD/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 Bd0 --> K*0 (-> K pi) l+ l- and time-integrated CP-asymmetries without tagging for (anti-Bs, Bs) --> phi (--> K- K+) l+ l- decays in view of the latest B-factory and CDF results and the forthcoming LHCb measurements.