Nonleptonic decays of K mesons revisited
Blok, B. · Shifman, M.
Original · EN
We estimate nonfactorizable 1/Nc contributions in the K→ 2π amplitudes using the approach proposed in our previous work. It is demonstrated that for the conventional (nonpenguin) operators these contributions are close in magnitude to factorizable 1/Nc parts and have the opposite sign. Thus, an approximate rule of discarding 1/Nc corrections in K→ 2π decays is theoretically confirmed. As a result we find an extra suppression of the matrix element of O₄ (ΔI=3/2) and an extra enhancement of the matrix element of O₁ (ΔI=1/2). The parameter B describing K⁰- K⁰ mixing is also discussed.
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