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ID 14580
file
creator
JLQCD, Collaboration
Aoki, S
Burkhalter, R
Fukugita, M
Hashimoto, S
Ishizuka, N
Iwasaki, Y
Kanaya, K
Kaneko, T
Kuramashi, Y
Onogi, T
Tsutsui, N
Ukawa, A
Yamada, N
Yoshié, T
NDC
Physics
abstract
We present a high statistics study of the light hadron spectrum and quark masses in QCD with two flavors of dynamical quarks. Numerical simulations are carried out using the plaquette gauge action and the O(a)-improved Wilson quark action at beta=5.2, where the lattice spacing is found to be a=0.0887(11) fm from the rho meson mass, on a 203×48 lattice. At each of five sea quark masses corresponding to mPS/mV~=0.8–0.6, we generate 12 000 trajectories using a symmetrically preconditioned Hybrid Monte Carlo algorithm. Finite spatial volume effects are investigated employing 123×48, 163×48 lattices. We also perform a set of simulations in quenched QCD with the same lattice actions at a similar lattice spacing to those for the full QCD runs. In the meson sector we find clear evidence of sea quark effects. The J parameter increases for lighter sea quark masses, and the full QCD meson masses are systematically closer to experiment than in quenched QCD. Careful finite-size studies are made to ascertain that these are not due to finite-size effects. Evidence of sea quark effects is less clear in the baryon sector due to larger finite-size effects. We also calculate light quark masses and find mud[overline MS](2 GeV)=3.223(-0.069+0.046) MeV and ms[overline MS](2 GeV)=84.5(-1.7+12.0) MeV which are about 20(null)maller than in quenched QCD.
journal title
Physical Review D
volume
Volume 68
start page
054502
date of issued
2003
publisher
The American Physical Society
issn
1550-7998
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2003 The American Physical Society
relation is version of URL
http://dx.doi.org/10.1103/PhysRevD.68.054502
department
Graduate School of Science