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ID 14580
本文ファイル
著者
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
物理学
抄録(英)
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.
掲載誌名
Physical Review D
68巻
開始ページ
054502
出版年月日
2003
出版者
The American Physical Society
ISSN
1550-7998
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2003 The American Physical Society
関連情報URL(IsVersionOf)
http://dx.doi.org/10.1103/PhysRevD.68.054502
部局名
理学研究科