Vector meson exchange contributions to K->pi gamma gamma and K-L->gamma l(+)l(-)

被引:51
作者
DAmbrosio, G
Portoles, J
机构
关键词
radiative non-leptonic kaon decays; non-leptonic weak Hamiltonian; Chiral Perturbation Theory; vector meson dominance;
D O I
10.1016/S0550-3213(97)00116-8
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 have studied in the framework of Chiral Perturbation Theory (chi PT) the O(p(6)) vector meson contributions to K --> pi gamma gamma and K-L --> gamma gamma*. We construct the most general chi PT Lagrangian for the weak vector-pseudoscalar-photon (VP gamma) vertex for K --> pi gamma gamma and K-L --> gamma gamma* and consequently we get the full structure of the O(p(6)) local contributions generated by vector meson exchange. We then compute new factorizable contributions to the weak VP gamma vertex generated by the odd-intrinsic parity violating Lagrangian with no additional couplings. We find in fact a very nice agreement with the phenomenology of K --> pi gamma gamma and K-L --> gamma gamma*, more predictive power and a deeper understanding of the O(p(6)) local operators. A novel interpretation of the K-L --> gamma gamma* data is given, Also a comparison with the existing models is presented. (C) 1997 Elsevier Science B.V.
引用
收藏
页码:417 / 451
页数:35
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