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

Authors
GENG CQ HSU IJ LIN YC
Citation
Cq. Geng et al., COMMENTS ON LONG-DISTANCE CONTRIBUTION TO K-]PI(+)NU(NU)OVER-BAR(), Physics letters. Section B, 355(3-4), 1995, pp. 569-572
Citations number
11
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
355
Issue
3-4
Year of publication
1995
Pages
569 - 572
Database
ISI
SICI code
0370-2693(1995)355:3-4<569:COLCTK>2.0.ZU;2-5
Abstract
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 l imit. The leading contribution arises from the one-loop amplitude, whi ch 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 comp ared with that of short distance one and hence is completely negligibl e.