Connecting Bd and Bs decays through QCD factorisation and flavour symmetries
Abstract
We analyse Bd,s -> K(*)0 K(*)0 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 such penguin-mediated decays to constrain some CKM angles. We determine Bs -> KK branching ratios and CP-asymmetries as functions of Adir(Bd -> K0 K0). Applying the same techniques to Bd,s-> K*0 K*0, we outline strategies to determine the Bs mixing angle.
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