Analyzing ε ′ / ε in the 1 / N c Expansion

We present a recent analysis of ε′/ε in the 1/Nc expansion. We show that the 1/Nc corrections to the matrix element of Q6 are large and positive, indicating a ∆I = 1/2 enhancement similar to the one of Q1 and Q2 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. Talk presented by P.H. Soldan at The 3rd International Conference on B Physics and CP Violation, Taipei, Taiwan, December 3 7, 1999. E-mail: [email protected] E-mail: [email protected] E-mail: [email protected] E-mail: [email protected] ANALYZING ε/ε IN THE 1/Nc EXPANSION a T. HAMBYE INFN Laboratori Nazionali di Frascati,I-00044 Frascati, Italy G.O. KÖHLER, E.A. PASCHOS, P.H. SOLDAN Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany We present a recent analysis of ε/ε in the 1/Nc expansion. We show that the 1/Nc corrections to the matrix element of Q6 are large and positive, indicating a ∆I = 1/2 enhancement similar to the one of Q1 and Q2 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.