CP violation and limits on New Physics including recent $B_s$ 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 $B_d^0$--${\bar{B}}_d^0$ and $B_s^0$--${\bar{B}}_s^0$ mixings. Our analyses include information on a large set of asymmetries, leading to the measurement of the CKM phases $\gamma$ and $\bar{\beta }$, as well as recent data from D0 and CDF related to the $B_s^0$--${\bar{B}}_s^0$ system such as the measurement of $\Delta M_{B_s}$, $A_{SL}$ and $\Delta {\Gamma }_s^{CP}$. We examine in detail several observables such as the asymmetries $A_{sl}^d$, $A_{SL}$, the width differences $\Delta {\Gamma }_d$ and $\Delta {\Gamma }_s^{CP}$ and discuss the rôle 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 $\bar{\chi }$ entering in $B_s^0$--${\bar{B}}_s^0$ mixing and study the impact of a future measurement of $\bar{\chi }$ to be achieved at LHC, through the measurement of the time-dependent CP asymmetry in $B_s\to J/\Psi \Phi$ decays.

29 pages, 31 figures; updated analyses and references

References in corpus (5)

• Hints of large tan(beta) in flavour physics
• Direct Limits on the Bs Oscillation Frequency
• Constraints on new physics from the quark mixing unitarity triangle
• Measurement of phi_3 with Dalitz plot analysis of B+ -> D(*)K(*)+ decay
• Measurement of the CP-violation parameter of B^0 mixing and decay with pp(bar) -> mu mu X data

Cited by in corpus (5)

• Unparticle physics effects in B_s mixing
• Small violations of unitarity, the phase in Bs mixing and visible t->cZ decays at the LHC
• Complex CKM matrix, spontaneous CP violation and generalized $\mu$-$\tau$ symmetry
• Minimal flavour violations and tree level FCNC
• Impact of Delta mB_s on the determination of the unitary triangle and bounds on physics beyond the Standard Model