Exploring Bd,s-> KK decays through flavour symmetries and QCD-factorisation
Abstract
We present a new analysis of Bd,s->KK modes within the SM, relating them in a controlled way through SU(3)-flavour symmetry and QCD-improved factorisation. We propose a set of sum rules for Bd,s-> K0 K0 observables. We determine Bs-> KK branching ratios and CP-asymmetries as functions of Adir(Bd-> K0 K0), 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-.
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