Exclusive Semileptonic and Rare B-Meson Decays in QCD

: We present the first complete results for the semileptonic and rare radiative form factors of B-mesons weak decay into a light vector-meson (ae; !; K ; OE) in the light-cone sum-rule approach. The calculation includes radiative corrections, higher-twist corrections and SU(3)- breaking effects. The theoretical uncertainty is investigated in detail. A simple parametrization of the form factors is given in terms of three parameters each. We find that the form factors observe several relations inspired by heavy-quark symmetry. Submitted to Physical Review D Heisenberg Fellow y On leave of absence from St.Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia 1 Introduction The challenge to understand the physics of CP-violation related to the structure of the CKM mixing matrix in (and beyond) the Standard Model is fuelling an impressive experimental programme for the study of B-decays, both exclusive and inclusive. Abundant data in various exclusive channels are expecte..