D0 dimuon charge asymmetry from B_s system with Z' couplings and the recent LHCb result

Understand

The D0 collaboration has announced the observation of the like-sign dimuon charge asymmetry since 2010, which has more than 3\sigma deviation from the Standard Model prediction.

• One of the promising explanation is considering the existence of flavor changing Z' couplings to the b and s quarks which can contribute to the off-diagonal decay width in the B_s - \bar{B}_s mixing.
• Model construction is highly constrained by the recent LHCb data of 1fb^{-1} integrated luminosity .
• In this paper, we analyze the experimental constraints in constructing new physics models to explain the dimuon charge asymmetry from the CP violation of the B_s system.