1206.0914 (J. M. Gerard et al.)

Weakly-induced strong CP-violation    [PDF]

J. M. Gerard, P. Mertens

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).

View original: http://arxiv.org/abs/1206.0914