There has been a lot of recent interest in experimental hints of CP violation in B_{d,s}^0 mixing. The D0 measurement of the semileptonic CP asymmetry would - with higher significance - be a clear signal of beyond the standard model physics. In this talk I present a relation [arXiv:1203.3545] for the mixing parameters, which allows clearer interpretation of the data in models in which new physics enters in M_{12} and/or \Gamma_{12}. This result implies that the central value of the D0 measurement in B_{d,s}^0 decay is not only in conflict with the standard model, but in a stronger tension with data on \Delta\Gamma_s than previously appreciated. After I derive the relation between the theoretical prediction of |\Gamma_{12}| and the measurements of \Delta M, \Delta \Gamma and A_{\rm SL}, I will explain how this result can help to better constrain \Delta\Gamma or A_{SL}, whichever is less precisely measured.

Due to the large travel, accommodation, and registration costs, I would like to ask for financial help.