Penguin-mediated B_(d,s)->VV decays and the Bs - anti-Bs mixing angle

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Descotes-Genon, Sebastien
Matias, Joaquim
Virto, Javier
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In this letter, we propose three different strategies to extract the weak mixing angle phi_s of the Bs system using penguin-mediated decays into vectors, mainly Bs->K*K*, Bs->phi K* and Bs->phi phi. We also provide predictions for the longitudinal branching ratio and CP-asymmetries of Bs->K*K* using a method that combines QCD factorisation with flavour symmetries to relate this decay to its Bd counterpart.
Comment: 16 pages, 4 figures. References added. Version published in PRD
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High Energy Physics - Phenomenology
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