Pion decay constant for the Kogut-Susskind quark action in quenched lattice QCD

JLQCD Collaboration

Aoki Sinya

Fukugita Masataka

Hashimoto Shoji

Ishikawa Ken-Ichi

Ishizuka Naruhito

Iwasaki Yoichi

Kanaya Kazuyuki

Kaneko Takashi

Kaya Shogo

Kuramashi Yoshinobu

Okawa Masanori

Onogi Tetsuya

Tominaga Shin-ichi

Tsutsui Naoto

Ukawa Akira

Yamada Norikazu

Yoshie Tomoteru

Physical Review D

We present a study for the pion decay constant fπ in the quenched approximation to lattice QCD with the Kogut-Susskind (KS) quark action, with the emphasis given to the renormalization problems. Numerical simulations are carried out at the couplings β=6.0 and 6.2 on 323×64 and 483×64 lattices, respectively. The pion decay constant is evaluated for all KS flavors via gauge invariant and noninvariant axial vector currents with the renormalization constants calculated by both the nonperturbative method and perturbation theory. We obtain fπ=89(6) MeV in the continuum limit as the best value using the partially conserved axial vector current, which requires no renormalization. From a study for the other KS flavors we find that the results obtained with the nonperturbative renormalization constants are well convergent among the KS flavors in the continuum limit, confirming restoration of SU(4)A, flavor symmetry, while perturbative renormalization still leaves an apparent flavor breaking effect even in the continuum limit.

eng

American Physical Society

Copyright (c) 2000 The American Physical Society.

[ISSN] 1550-7998

[DOI] 10.1103/PhysRevD.62.094501

[NCID] AA00773624

[DOI] http://dx.doi.org/10.1103/PhysRevD.62.094501