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

Sebastien Descotes-Genon (1) , Joaquim Matias (2) , Javier Virto (2)

1 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
2 IFAE - Institut de Física d’Altes Energies [Barcelone]

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.

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

Sebastien Descotes-Genon, Joaquim Matias, Javier Virto. Penguin-mediated B_(d,s)->VV decays and the Bs - anti-Bs mixing angle. Physical Review D, 2007, 76, pp.074005. ⟨10.1103/PhysRevD.76.074005⟩. ⟨hal-00145056⟩