Weakly-induced strong CP-violation
arXiv:1206.0914 · doi:10.1016/j.physletb.2012.08.036
Abstract
Weak interaction contributions to the strong theta parameter are revisited in the frame of a large-Nc Chiral Perturbation Theory. Focusing on the hadronic (eta,etaprime) \to pi pi amplitudes, we express these second-order corrections in terms of the CP-violating parameter in K \to pi pi decays to obtain Delta_w(theta) approx 10^{-17} at O(GF^2 epsilonprime).
11 pages, 1 figure. One reference and comments on electroweak corrections added. Version published in Physics Letters B