arXiv:0905.2105v1 [hep-ph] 13 May 2009 Supersymmetry and CP violation in B 0 s − ¯ B 0 s mixing and B 0 s → J/ψφ decay Alakabha Datta 1 and Shaaban Khalil 2,3 1 Dept of Physics and Astronomy, 108 Lewis Hall, University of Mississippi, Oxford, MS 38677-1848, USA. 2 Center for Theoretical Physics at the British University in Egypt, Sherouk City, Cairo 11837, Egypt. 3 Department of Mathematics, Ain Shams University, Faculty of Science, Cairo, 11566, Egypt. Abstract Supersymmetric contributions to time independent asymmetry in B 0 s → J/ψφ process are analyzed in the view of the recent Tevatron experimental measurements. We show that the experimental limits of the mass difference ΔM Bs and the mercury EDM significantly constrain the SUSY contribution to B 0 s − ¯ B 0 s mixing, so that sin 2β s < ∼ 0.1. We also point out that the one loop SUSY contribution to B 0 s → J/ψφ decay can be important and can lead to large indirect CP asymmetries which are different for different polarization states. These new physics effects in the decay amplitude can be consistent with CP measurements in the B d system. 1 Introduction Recently, CDF and D0 collaborations have announced the observation of CP viola- tion in B 0 s − ¯ B 0 s mixing. The following results, for B 0 s -mixing CP violating phase, have been reported [1, 2]: 2β s = 0.57 +0.30 −0.24 (stat.) +0.02 −0.07 (syst.) (DO), (1) 2β s ∈ [0.32, 2.82] (68%) (CDF ). (2) These results indicate that the phase β s deviates more that 3σ from the Standard Model (SM) prediction [3]. Therefore, the experimental observation of CP violation in B 0 s mixing, along with the Belle and Baber measurement for direct and indirect CP asymmetries of B d decays, open the possibility of probing new physics effect at low energy. 1