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The long distance contribution to $K^+ \to \pi^+ \nu {\bar \nu} $ iscalculated using chiral perturbation theory. The leading contribution comesfrom $O(p^4)$ tree terms. The branching ratio of the $O(p^4)$ long distancecontribution is found to be of order $10_{-3}$ smaller than the short distancecontributions.Comment: 12 pages, 1 figure (available upon request

Long-distance contribution to $$K^ + \to \pi ^ + v\bar v$$ decay and O(p 4) terms in CHPTdecay and O(p 4) terms in CHPT