Finite-size effects of hadron masses in lattice QCD: A comparative study for quenched and full QCD simulations

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.486· OSTI ID:7296246

Aoki, S; Umemura, T; Fukugita, M; Ishizuka, N; Mino, H; Okawa, M; Ukawa, A ^[1]

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1. Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305 (Japan) Yukawa Institute, Kyoto University, Kyoto 606 (Japan) Faculty of Engineering, Yamanashi University, Kofu 404 (Japan) National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 305 (Japan)

A study of finite-size effects is carried out for hadron masses in the quenched simulation of lattice QCD using the Kogut-Susskind quark action. It is found that finite-size effects for quenched QCD are much smaller than those for full QCD, when hadron masses for the two cases are compared at the same physical lattice size and lattice spacing. Based on an extensive study of the boundary condition dependence of hadron masses we ascribe the origin of the difference to a partial cancellation of the finite-size effects among the [ital Z](3)-related gauge configurations in quenched QCD; such a cancellation does not take place in full QCD due to [ital Z](3) breaking effects of dynamical quarks. However, this does not mean finite-size errors are negligible in quenched QCD for lattice sizes of 2 to 3 fm used in current simulations; a still significant finite-size shift of hadron masses, especially of the nucleon mass, would pose a serious hindrance to obtaining the hadron mass spectrum at the few percent level aimed at in current quenched QCD simulations.

• OSTI ID: 7296246
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 50:1; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662110 -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
662230* -- Quantum Chromodynamics-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELEMENTARY PARTICLES
FIELD THEORIES
HADRONS
LATTICE FIELD THEORY
MASS SPECTRA
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SIMULATION
SPECTRA