The Delta I=1/2 selection rule

被引:41
作者
Antonelli, V
Bertolini, S
Fabbrichesi, M
Lashin, EI
机构
[1] SCUOLA INT SUPER STUDI AVANZATI, I-34014 TRIESTE, ITALY
[2] AIN SHAMS UNIV, FAC SCI, DEPT PHYS, CAIRO, EGYPT
关键词
D O I
10.1016/0550-3213(96)00145-9
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We compute the isospin I = 0 and 2 amplitudes for the decay of a kaon into two pions by estimating the relevant hadronic matrix elements in the chiral quark model. The results are parametrized in terms of the quark and gluon condensates and of the constituent quark mass M. The latter is a parameter characteristic of the model, which we restrict by matching the results in the two gamma(5)-schemes (HV and NDR) of dimensional regularization. We find that, for values of these parameters within the current determinations, the Delta I = 1/2 selection rule is well reproduced by means of the cumulative effects of short-distance NLO Wilson coefficients, penguin diagrams,non-factorizable soft-gluon corrections and meson-loop renormalization.
引用
收藏
页码:181 / 201
页数:21
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