1205.4948 (M. Ciuchini et al.)

Testing the Standard Model and searching for New Physics with $B_d \to
ππ$ and $B_s \to K K$ decays    [PDF]

M. Ciuchini, E. Franco, S. Mishima, L. Silvestrini

We propose to perform a combined analysis of $B \to \pi\pi$ and $B_s \to K^+ K^-$ modes, in the framework of a global CKM fit. The method optimizes the constraining power of these decays and allows to derive constraints on NP contributions to penguin amplitudes or on the $B_s$ mixing phase. We illustrate these capabilities with a simplified analysis using the recent measurements by the LHCb Collaboration, neglecting correlations with other SM observables.

View original: http://arxiv.org/abs/1205.4948