Meson-cloud contributions in K->pi weak transitions

被引：1
|
作者：
Zenczykowski, P
机构：
[1] Department of Theoretical Physics, H. Niewodniczański Institute of Nuclear Physics, Kraków
来源：
PHYSICAL REVIEW D | 1996年 / 54卷 / 01期
关键词：
D O I：
10.1103/PhysRevD.54.907
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Contributions of low-energy ''eye'' and ''figure-eight'' quark diagrams to the K-->pi weak transitions are studied in a hadron-level phenomenological approach in which they originate from meson-cloud effects. If contributions from cloud mesons exhibit SU(6) symmetry, only the ''eye'' (low-energy penguin) diagram is nonvanishing. When the symmetry between contributions from intermediate pseudoscalar and vector mesons is broken, the Delta I=1/2(Delta I=3/2) amplitudes are enhanced (suppressed). The overall long-distance-induced enhancement of the ratio of the Delta I=1/2 amplitudes over the Delta I=3/2amplitudes is estimated at around 2.
引用
收藏
页码：907 / 913
页数：7
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