Constraining CP violation in neutral meson mixing with theory input
Abstract
There has been a lot of recent interest in the experimental hints of CP violation in Bd,s0 mixing, which would be a clear signal of beyond the standard model physics (with higher significance). We derive a new relation for the mixing parameters, which allows clearer interpretation of the data in models in which new physics enters in M12 and/or 12. Our results imply that the central value of the D\ measurement of the semileptonic CP asymmetry in Bd,s0 decay is not only in conflict with the standard model, but in a stronger tension with data on s than previously appreciated. This result can be used to improve the constraint on or ASL, whichever is less precisely measured.
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