QCD factorisation and flavour symmetries illustrated in Bd,s -> KK decays
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), with a good agreement with current experimental measurements of CDF. Finally, we predict the amount of U-spin breaking between Bd -> pi+ pi- and Bs -> K+K-.
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