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Vector meson contributions in ε′/ε
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DOI：10.1016/j.physletb.2004.06.096.png)
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Abstract
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The CP-violating parameter epsilon'/epsilon is computed using the low-energy dynamics of the 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. (C) 2004 Elsevier B.V. All rights reserved.
Keywords:
is an element of '/is an element of
direct CP-violation
K meson
large-N-c QCD
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