New CP phase of $B_s-\bar B_s$ mixing on ${\rm T}$ violation in $B_{d(s)}\to K^*(ϕ) \ell^{+} \ell^{-}$

Abstract

A large CP-violating phase uncovered recently by CDF and D$Ø$ collaborations in the time-dependent CP asymmetry (CPA) of the $B_s\to J/Ψϕ$ decay clearly indicates that a non-Cabibbo-Kobayashi-Maskawa (CKM) phase has to be brought into the $b\to s$ transition. We find that the model with $SU(2)_L$ singlet exotic quarks can not only provide the new phase induced from the Z-mediated flavor changing neutral current (FCNC) at tree level, but also strongly relate the $B_s-\bar B_s$ mixing, $B_q\to V_q \ell^{+} \ell^{-}$ ($V_{d[s]}=K^*[ϕ])$ and $B_s\to μ^{+} μ^{-}$ together. In particular, we show that the new CP phase can be unambiguously exposed by the large statistical significances of $T$ violating observables in $B_q\to V_q \ell^{+} \ell^{-}$, while the branching ratio of $B_s\to μ^{+} μ^{-}$ can be enhanced to be $O(10^{-8})$.

10 pages, 2 figures, version revised, references added, version to appear in Physics Letters B