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Prog. Theor. Phys. Vol. 101 No. 4 (1999) pp. 937-946

Long Distance Contribution to K⁺→π⁺νν at O(p⁴) in ChPT

C. Q. Geng, I. J. Hsu and C. W. Wang

Department of Physics, National Tsing Hua University
Hsinchu, Taiwan, Republic of China

(Received September 14, 1998)

Abstract:

We calculate the long distance contributions to K⁺→π⁺νν within the framework of chiral perturbation theory (ChPT). We derive a general form of the weak Lagrangian of O(p⁴) in the chiral expansion from the factorization model. We estimate the decay branching ratio of K⁺→π⁺νν at the level of O(p⁴) for both tree and complete one-loop contributions, and compare our results with those in the literature.

URL : http://ptp.ipap.jp/link?PTP/101/937/
DOI : 10.1143/PTP.101.937

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