Abstract
We present an update of the analysis of B s mixing by the UTfit Collaboration, including the very recent tagged analyses of B s → J / Ψ ϕ by the CDF and DO collaborations. We find that the phase of the B s mixing amplitude deviates more than 2.9σ from the Standard Model prediction. This results points to extensions of the Standard Model with new sources of CP violation. We compare this result with the analysis of B d mixing and show that present data favour the presence of a new source of flavour violation. Finally, we consider the impact of this analysis for SUSY models and the possible implications for new physics effects in b → s hadronic penguin decays.
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