Zooming into CP violation in B (s) → hh decays

The LHCb collaboration has recently reported the first observation of CP violation in the penguin-dominated Bs0→ K−K+ decay and further new measurements, indicating differences between the direct CP asymmetries of both the Bs0→ K−K+, Bd0→ π−K+ and the Bd0→ π−π+, Bs0→ K−π+ modes. We show that these puzzling differences can be accommodated through sizeable penguin annihilation and exchange topologies in the Standard Model, and constrain them. Utilising the U-spin symmetry, we extract the angle γ of the unitarity triangle from the CP asymmetries in the Bs0→ K−K+, Bd0→ π−π+ system alone, finding γ=(65−7+11)°, in perfect agreement with the determination from tree-level B → DK decays. The Bs0−B¯s0 mixing phase ϕs can be extracted from CP violation measurements in Bs0→ K−K+ in a clean way. We present a new strategy and extract ϕs = −(3.6 ± 5.4)°. This result is in agreement with the determination from Bs0→ J/ψϕ decays. New CP-violating contributions would influence these determinations differently. Hence it is interesting to keep monitoring both as the experimental picture sharpens