Constraining CP violation in neutral meson mixing with theory input

الأصل · EN

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 Γ₁2. Our results imply that the central value of the DØ 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 ΔΓₛ than previously appreciated. This result can be used to improve the constraint on ΔΓor AₛL, whichever is less precisely measured.