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arXiv · hep-ph/9205241

Nonleptonic decays of K mesons revisited

B. Blok·M. Shifman
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Abstract

We estimate nonfactorizable 1/$N_c$ contributions in the $K\rightarrow 2π$ 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 $1/N_c$ parts and have the opposite sign. Thus, an approximate rule of discarding $1/N_c$ corrections in $K\rightarrow 2π$ decays is theoretically confirmed. As a result we find an extra suppression of the matrix element of $O_4$ ($ΔI=3/2$) and an extra enhancement of the matrix element of $O_1$ ($ΔI=1/2$). The parameter $B$ describing $K^0-\bar K^0$ mixing is also discussed.

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B. Blok, M. Shifman. 1992-05-28. Nonleptonic decays of K mesons revisited. https://doi.org/10.1016/0370-2693(92)91543-i

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