Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2001-08-16
Phys.Rev.D65:054507,2002
Physics
High Energy Physics
High Energy Physics - Lattice
Version accepted for publication by PRD. A few minor typographical errors have been corrected. 24 pages, 11 figures
Scientific paper
10.1103/PhysRevD.65.054507
The chiral properties of the pseudoscalar mesons are studied numerically on a quenched $20^4$ lattice with the overlap fermion. We elucidate the role of the zero modes in the meson propagators, particularly that of the pseudoscalar meson. The non-perturbative renormalization constant $Z_A$ is determined from the axial Ward identity and is found to be almost independent of the quark mass for the range of quark masses we study; this implies that the $O(a^2)$ error is small. The pion decay constant, $f_{\pi}$, is calculated from which we determine the lattice spacing to be 0.148 fm. We look for quenched chiral log in the pseudoscalar decay constants and the pseudoscalar masses and we find clear evidence for its presence. The chiral log parameter $\delta$ is determined to be in the range 0.15 -- 0.4 which is consistent with that predicted from quenched chiral perturbation theory.
Dong Shao-Jing
Draper Terrence
Horvath Ildiko
Lee Frank X.
Liu Keh-Fei
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