title: Exploring Bd,s-->KK decays through flavor symmetries and QCD factorization.
abstract: We present a new analysis of Bd,s-->KK modes within the standard model (SM), relating them in a controlled way through SU(3)-flavor symmetry and QCD-improved factorization. We propose a set of sum rules for Bd,s-->K0K0 observables. We determine Bs-->KK branching ratios and CP asymmetries as functions of Adir(Bd-->K0K0), pointing out a conflict between BR(Bs-->K+K-) in the SM and data. Finally, we predict the amount of U-spin breaking between Bd-->pi+pi- and Bs-->K+K-.
authors.affiliation: Laboratoire de Physique Théorique, CNRS/Université Paris-Sud 11 (UMR 8627), 91405 Orsay Cedex, France.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Descotes-Genon
authors.forename: Joaquim
authors.initials: J
authors.lastname: Matias
authors.forename: Javier
authors.initials: J
authors.lastname: Virto