CP violation and limits on New Physics including recent Bs measurements

Abstract

We analyse present constraints on the SM parameter space and derive, in a model independent way, various bounds on New Physics contributions to Bd(0)-(B)over-bar(0)(d) and Bs(0)-(B)over-bar(0)(s) mixings. Our analyses include information on a large set of asymmetries, leading to the measurement of the CKM phases γ and (β)over-bar, as well as recent data from D0 and CDF related to the Bs(0)-(B)over-bar(0)(s) system such as the measurement of ΔMBs, A and ΔΓ(CP)(s). We examine in detail several observables such as the asymmetries A(sl)(d), A, the width differences ΔΓ(d) and ΔΓ(CP)(S) and discuss the role they play in establishing the limits on New Physics. The present data clearly favour the SM, with the New Physics favoured region placed around the SM solution. A New Physics solution significantly different from the SM is still allowed, albeit quite disfavoured (2.6% probability). We analyse the presently available indirect knowledge on the phase (Χ)over-bar entering in Bs(0)-Bs(0) mixing and study the impact of a future measurement of (Χ)over-bar to be achieved at LHC, through the measurement of the time-dependent CP asymmetry in Bs -> J/Ψ Θ decays.