QCD factorisation and flavour symmetries illustrated in B_d,s -> KK decays
@article{DescotesGenon2007QCDFA,
title={QCD factorisation and flavour symmetries illustrated in B\_d,s -> KK decays},
author={S{\'e}bastien Descotes-Genon},
journal={arXiv: High Energy Physics - Phenomenology},
year={2007}
}We present a new analysis of B_d,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 B_d,s -> K^0 \bar K^0 observables. We determine B_s -> KK branching ratios and CP-asymmetries as functions of A_dir(B_d -> K^0 \bar K^0), with a good agreement with current experimental measurements of CDF. Finally, we predict the amount of U-spin breaking between B_d -> pi+ pi- and B_s -> K+K-.