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Titolo:
Topological susceptibility in lattice QCD with two flavors of dynamical quarks - art. no. 114501
Autore:
Khan, AA; Aoki, S; Burkhalter, R; Ejiri, S; Fukugita, M; Hashimoto, S; Ishizuka, N; Iwasaki, Y; Kanaya, K; Kaneko, T; Kuramashi, Y; Manke, T; Nagai, K; Okawa, M; Shanahan, HP; Ukawa, A; Yoshie, T;
Indirizzi:
Univ Tsukuba, Ctr Computat Phys, Tsukuba, Ibaraki 3058577, Japan Univ Tsukuba Tsukuba Ibaraki Japan 3058577 sukuba, Ibaraki 3058577, Japan Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 3058571, Japan Univ Tsukuba Tsukuba Ibaraki Japan 3058571 sukuba, Ibaraki 3058571, Japan Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan Univ Tokyo Kashiwa Chiba Japan 2778582 Res, Kashiwa, Chiba 2778582, Japan KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan KEKTsukuba Ibaraki Japan 3050801 es Org, Tsukuba, Ibaraki 3050801, Japan
Titolo Testata:
PHYSICAL REVIEW D
fascicolo: 11, volume: 6411, anno: 2001,
pagine: 4501 -
SICI:
0556-2821(200112)6411:11<4501:TSILQW>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
YANG-MILLS-THEORY; HYBRID MONTE-CARLO; FULL QCD; GAUGE-THEORY; SU(3) VACUUM; SIGMA-MODEL; INSTANTONS; LIMIT; U(1); SPECTRUM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Khan, AA Univ Tsukuba, Ctr Computat Phys, Tsukuba, Ibaraki 3058577, Japan Univ Tsukuba Tsukuba Ibaraki Japan 3058577 baraki 3058577, Japan
Citazione:
A.A. Khan et al., "Topological susceptibility in lattice QCD with two flavors of dynamical quarks - art. no. 114501", PHYS REV D, 6411(11), 2001, pp. 4501

Abstract

We present a study of the topological susceptibility in lattice QCD with two degenerate flavors of dynamical quarks. The topological charge is measured on gauge configurations generated with a renormalization group improved gauge action and a mean held improved clover quark action at three values of beta = 6/g(2) with four sea quark masses at each beta. The lattice spacings at these beta 's are a approximate to 0.22, 0.16 and 0.11 fm at the physical up and down quark mass, which are fixed by the physical rho meson mass. The study is supplemented by simulations of pure SU(3) gauge theory with the same gauge action at 5 values of beta with lattice spacings 0.09 fm less than or similar toa less than or similar to0.27 fm. We employ a field-theoretic definition of the topological charge together with cooling. For the topological susceptibility in the continuum limit of pure SU(3) gauge theory we obtain chi (1/4)(t) = 197(-16)(+13) MeV where the error shows statistical and systematic ones added in quadrature, In full QCD chi (t) at heavy sea quark masses is consistent with that of pure SU(3) gauge theory. A decrease of chi (t) toward light quark masses, as predicted by the anomalous Ward-Takahashi identity for U(1) chiral symmetry, becomes clearer for smaller lattice spacings. The cross over in the behavior of chi (t) from heavy to light sea quark masses is discussed.

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Documento generato il 29/03/20 alle ore 08:43:14