Bs0-B̄s0 mixing and b→s transitions in an isosinglet down quark model

Abstract

The recent observation of the mass difference in the Bs system seems to be not in complete agreement with the corresponding standard model value. We consider the model with an extra vectorlike down quark to explain this discrepancy and obtain the constraints on the new physics parameters. Thereafter, we show that with these new constraints this model can successfully explain other observed deviations associated with b→s transitions, namely, Bs→ψ, B→Kπ, and B→Ks. © 2008 The American Physical Society.