Constraining CP violation in neutral meson mixing with theory input

Details Constraining CP violation in neutral meson mixing with theory input Constraining CP violation in neutral meson mixing with theory input

2012-03-15

arxiv.org/abs/1203.3545v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures, informed of prior derivation of eq. (21), title modified

Scientific paper

There has been a lot of recent interest in the experimental hints of CP violation in B_{d,s}^0 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 M_12 and/or \Gamma_12. Our results imply that the central value of the D\O\ measurement of the semileptonic CP asymmetry 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. This result can be used to improve the constraint on \Delta\Gamma or A_SL, whichever is less precisely measured.

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