2022-01-22T07:46:33Zhttps://tsukuba.repo.nii.ac.jp/oaioai:tsukuba.repo.nii.ac.jp:000078242021-03-02T11:52:06ZK+→π+π0 decay amplitude with the Wilson quark action in quenched lattice QCD岩崎, 洋一Aoki, S.Fukugita, M.Hashimoto, S.Ishizuka, N.Iwasaki, Y.Kanaya, K.Kuramashi, Y.Okawa, M.Ukawa, A.Yoshié, T.©1998 The American Physical Societyapplication/pdfWe present a calculation for the K+→π+π0 decay amplitude using a quenched simulation of lattice QCD with the Wilson quark action at β=6/g2=6.1. The decay amplitude is extracted from the ratio, the K→ππ three-point function divided by either K and π meson two-point functions or K meson two-point function and I=2 ππ four-point function; the two different methods yield consistent results. Finite size effects are examined with calculations made on 243×64 and 323×64 lattices, and are shown that they are explained by one-loop effects of chiral perturbation theory. The lattice amplitude is converted to the continuum value by employing a one-loop calculation of chiral perturbation theory, yielding a value in agreement with experiment if extrapolated to the chiral limit. We also report on the K meson B parameter BK obtained from the K+→π+π0 amplitude using chiral perturbation theory.American Physical Society1998-07engjournal articlehttp://hdl.handle.net/2241/89390https://tsukuba.repo.nii.ac.jp/records/782410.1103/PhysRevD.58.0545030556-2821AA00773624Physical review D585054503https://tsukuba.repo.nii.ac.jp/record/7824/files/PRD_58-5.pdfapplication/pdf213.8 kB2013-12-18