An analysis of B_{d,s} mixing angles in presence of New Physics and an update of Bs -> K0* anti-K0

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]

We discuss a simple approach to measure the weak mixing angles phi_s and phi_d of the Bs and Bd systems in the presence of New Physics. We present a new expression that allows one to measure directly the New Physics mixing angles if New Physics contributes significantly to the mixing only. We apply the method to specific penguin-mediated B->PP, B->PV and B ->VV modes. We provide a very stringent and simple bound on the direct CP asymmetries of all these modes, the violation of which is a signal of New Physics in decay. Within the same theoretical framework, an updated prediction for the branching ratio of Bs->K0* anti-K0* is presented, which can be compared with a recent LHCb analysis.

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

Sebastien Descotes-Genon, Joaquim Matias, Javier Virto. An analysis of B_{d,s} mixing angles in presence of New Physics and an update of Bs -> K0* anti-K0. Physical Review D, 2012, 85, pp.034010. ⟨hal-00674706⟩