Vector Meson Contributions in epsilon'/epsilon

Abstract

The CP violating parameter epsilon'/epsilon is computed using the low-energy dynamics of a chiral theory supplemented by vector resonances. The divergent contributions coming from strong pi-pi scattering are tamed by vector-meson exchange terms. This amounts to softening the fast growing high-energy behaviour of pi-pi scattering. The final result for epsilon'/epsilon shows a smooth dependence on the cut-off where low energy dynamics is matched with that of QCD.

11 pages, 2 figures. published version

References in corpus (4)

• Isospin violation in epsilon'
• Isospin Breaking in K -> Pi Pi Decays
• Delta I=1/2 and epsilon'/epsilon in Large-Nc QCD
• epsilon'/epsilon at the NLO: 10 Years Later