New CP phase of B_s-B~ s mixing on T violation in B_(d(s)) → K~*(_))e~+e~

摘要

A large CP-violating phase uncovered recently by CDF and DO Collaborations in the time-dependent CP asymmetry (CPA) of the B_s → J/ψ_ decay clearly indicates that a non-Cabibbo-Kobayashi-Maskawa (CKM) phase has to be brought into the b →s transition. We find that the model with SU(2)_L singlet exotic quarks cannot only provide the new phase induced from the Z-mediated flavor changing neutral current (FCNC) at tree level, but also strongly relate the B_s-B_s mixing, B_q → V_qe~+e~- (V_(dls) = K~*_ ) and B_s → μ~+ μ~- together. In particular, we show that the new CP phase can be unambiguously exposed by the large statistical significances of T violating observables in B_q→V_qe~+e~-, while the branching ratio of B_s→μ~+μ~- can be enhanced to be O(10~(-8)).