Abstract
We present a calculation for the decay amplitude using a quenched simulation of lattice QCD with the Wilson quark action at The decay amplitude is extracted from the ratio, the three-point function divided by either and meson two-point functions or meson two-point function and four-point function; the two different methods yield consistent results. Finite size effects are examined with calculations made on and 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 meson parameter obtained from the amplitude using chiral perturbation theory.
- Received 25 November 1997
DOI:https://doi.org/10.1103/PhysRevD.58.054503
©1998 American Physical Society