Vector Meson Contributions in epsilon'/epsilon

Details Vector Meson Contributions in epsilon'/epsilon Vector Meson Contributions in epsilon'/epsilon

2004-05-25

arxiv.org/abs/hep-ph/0405250v4

Phys.Lett. B596 (2004) 256-264

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 2 figures. published version

Scientific paper

10.1016/j.physletb.2004.06.096

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.

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