epsilon'/epsilon Computation -- Long-distance Evolution

Details epsilon'/epsilon Computation -- Long-distance Evolution epsilon'/epsilon Computation -- Long-distance Evolution

1996-08-09

arxiv.org/abs/hep-ph/9608281v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Invited talk at Workshop on K physics, Orsay, France, 30 May -- 4 Jun 1996, 11 pp., LATEX, 4 eps figures

Scientific paper

We present a status report on our study of long-distance contributions to the decay amplitudes A(K^0 --> pi pi, I) in the framework of the 1/N expansion. We argue that a modified prescription for the identification of meson momenta in the chiral loop corrections has to be used to gain a self-consistent picture which allows an appropriate matching with the short-distance part. Possible uncertainties in the analysis of the density-density operators Q_6 and Q_8 which dominate the CP violation parameter epsilon'/epsilon are discussed. As a first result we present the long-distance 1/N correction to the gluon penguin operator Q_6 in the chiral limit.

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