COMMENTS ON LONG-DISTANCE CONTRIBUTION TO K+-]PI(+)NU(NU)OVER-BAR

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题名:	COMMENTS ON LONG-DISTANCE CONTRIBUTION TO K+-]PI(+)NU(NU)OVER-BAR
作者:	GENG,CQ;HSU,IJ;LIN,YC
贡献者:	物理研究所
关键词:	KAON DECAYS
日期:	1995
上传时间:	2010-07-08 14:08:36 (UTC+8)
出版者:	中央大學
摘要:	We study the long distance contribution to K+ --> pi(+)<nu(nu)over bar> by using chiral perturbation theory. We find that the tree level O(P-2) contribution vanishes identically without assuming the large N-c limit. The leading contribution arises from the one-loop amplitude, which is O(P-4) in the chiral power counting. The branching ratio of the long distance contribution is found to be of order 10(-7) smaller compared with that of short distance one and hence is completely negligible.
關聯:	PHYSICS LETTERS B
显示于类别:	[物理研究所] 期刊論文

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