ANL - HEP - PR - 09 - 31 EFI - 09 - 02 MADPH - 09 - 1530 b → s Transitions in Family - dependent U ( 1 ) ′ Models

We analyze flavor-changing-neutral-current (FCNC) effects in the b→ s transitions that are induced by family non-universal U(1)′ gauge symmetries. After systematically developing the necessary formalism, we present a correlated analysis for the ∆B = 1, 2 processes. We adopt a model-independent approach in which we only require family-universal charges for the first and second generations and small fermion mixing angles. We analyze the constraints on the resulting parameter space from Bs − B̄s mixing and the time-dependent CP asymmetries of the penguin-dominated Bd → (π, φ, η′, ρ, ω, f0)KS decays. Our results indicate that the currently observed discrepancies in some of these modes with respect to the Standard Model predictions can be consistently accommodated within this general class of models. 1 ar X iv :0 90 6. 37 45 v1 [ he pph ] 1 9 Ju n 20 09