1/N_c and epsilon'/epsilon

Details 1/N_c and epsilon'/epsilon 1/N_c and epsilon'/epsilon

2000-09-06

arxiv.org/abs/hep-ph/0009073v1

Nucl.Phys.Proc.Suppl. 96 (2001) 323-328

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, Invited talk presented by T.H. at the QCD 00 High-Energy Physics International Euroconference in Quantum Chromodynami

Scientific paper

10.1016/S0920-5632(01)01148-3

We present a recent analysis of epsilon'/epsilon in the 1/N_c expansion. We show that the 1/N_c corrections to the matrix element of Q_6 are large and positive, indicating a Delta I = 1/2 enhancement similar to the one of Q_1 and Q_2 which dominate the CP conserving amplitude. This enhances the CP ratio and can bring the standard model prediction close to the measured value for central values of the parameters. Several comments on the theoretical status of epsilon'/epsilon and the errors in its calculation are given.

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