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 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.
Cite
@article{arxiv.1203.3545,
title = {Constraining CP violation in neutral meson mixing with theory input},
author = {Marat Freytsis and Zoltan Ligeti and Sascha Turczyk},
journal= {arXiv preprint arXiv:1203.3545},
year = {2013}
}
Comments
5 pages, 2 figures, informed of prior derivation of eq. (21), title modified