title: Enhanced electroweak penguin amplitude in B-->VV decays.
abstract: We discuss a novel electromagnetic penguin contribution to the transverse helicity amplitudes in B decays to two vector mesons, which is enhanced by two powers of mB/Lambda relative to the standard penguin amplitudes. This leads to unique polarization signatures in penguin-dominated decay modes such as B-->rhoK* similar to polarization effects in the radiative decay B-->K*gamma and offers new opportunities to probe the magnitude and chirality of flavor-changing neutral current couplings to photons.
authors.affiliation: Institut für Theoretische Physik E, RWTH Aachen, D-52056 Aachen, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Beneke
authors.forename: J
authors.initials: J
authors.lastname: Rohrer
authors.forename: D
authors.initials: D
authors.lastname: Yang