Constraints on the imaginary part versus the real part of a New Physics amplitude proceedings via B mixing for(left) Bd mesons and (right) Bs mesons. The SM point is at (1,0). The contours shown are all at 68% confidence level. (From the CM fitter group [95,96]).
Artuso et al. PMC Physics A 2009 3:3 doi:10.1186/1754-0410-3-3