A New Analysis of B_6^(1/2), B_8^(3/2), and the Delta I=1/2 Rule in the 1/N_c Expansion for K --> pi pi Decays

Details A New Analysis of B_6^(1/2), B_8^(3/2), and the Delta I=1/2 Rule in the 1/N_c Expansion for K --> pi pi Decays A New Analysis of B_6^(1/2), B_8^(3/2), and the Delta I=1/2 Rule in the 1/N_c Expansion for K --> pi pi Decays

1998-06-02

arxiv.org/abs/hep-ph/9806224v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 5 eps figures. Talk presented at the XVI Autumn School and Workshop on Fermion Masses, Mixing and CP Violation, Lisb

Scientific paper

We present a new calculation of long-distance contributions to the K --> pi pi amplitudes using the 1/N_c expansion within the framework of chiral perturbation theory. Along these lines we compute the chiral loop corrections to the operators Q_1, Q_2, Q_6, and Q_8. In the numerical analysis we present values for B_6^(1/2) and B_8^(3/2). We discuss also the implications for a theoretical understanding of the Delta I=1/2 selection rule.

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