Squark flavor mixing and CP asymmetry of neutral $B$ mesons at LHCb

Understand

The CP violation of the neutral $B$ meson is the important phenomenon to search for the new physics.

• The like-sign dimuon charge asymmetry observed by the D$\O$ Collaboration indicates the CP-violating new physics in the $B_s-\bar B_s$ mixing.
• On the other hand, LHCb observed the CP-violating asymmetry in $B_s^0\to J/\psi \phi$ and $B_s^0\to J/\psi f_0(980)$, which is consistent with the SM prediction.
• However, there is still room for new physics of the CP violation.