K+π+π0 Decay Amplitude in Quenched Lattice QCD
JLQCD Collaboration, S. Aoki, M. Fukugita, S. Hashimoto, N. Ishizuka, Y. Iwasaki, K. Kanaya, Y. Kuramashi, M. Okawa, A. Ukawa, T. Yoshie
Abstract
A new study is reported of a lattice QCD calculation of the K+π+ π0 decay amplitude with the Wilson quark action in the quenched approximation at β=6.1. The amplitude is extracted from the Kππ Green function, and a conversion to the continuum value is made employing a recent one-loop calculation of chiral perturbation theory. The result is consistent with the experimental value if extrapolated to the chiral limit.
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