Finite-size and quark mass effects on the QCD spectrum with two flavors

Journal Article · Mon Nov 01 00:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.4419· OSTI ID:5926486

Bernard, C; Blum, T; DeGrand, T A; DeTar, C; Gottlieb, S; Krasnitz, A; Sugar, R L; Toussaint, D ^[1]

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1. Department of Physics, Washington University, St. Louis, Missouri 63130 (United States) Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States) Physics Department, University of Colorado, Boulder, Colorado 80309 (United States) Physics Department, University of Utah, Salt Lake City, Utah 84112 (United States) Department of Physics, Indiana University, Bloomington, Indiana 47405 (United States) Department of Physics, Building 510A, Brookhaven National Laboratory, Upton, New York 11973 (United States) Interdisziplinaeres Projektzentrum fuer Supercomputing, RZ F 3, ETH-Zentrum CH-8092 Zuerich (Switzerland) Department of Physics, University of California, Santa Barbara, California 93106 (United States)

We have carried out spectrum calculations with two flavors of dynamical Kogut-Susskind quarks on four lattice sizes from 8[sup 3][times]24 to 16[sup 3][times]24 at couplings that correspond to chiral symmetry restoration for a lattice with six time slices. We estimate that the linear spatial sizes of the lattices range from 1.8 to 3.6 fm. We find significant finite-size effects for all particles between the smallest and largest volume with the larger quark mass that we study, [ital am][sub [ital q]]=0.025, where [ital a] is the lattice spacing. The nucelon experiences the largest effect of about 6%. We also study a lighter quark mass, [ital am][sub [ital q]]=0.0125, on the two largest lattices. Effects of the dynamical and valence quark masses on the hadron spectrum are studied both directly, by comparing the two simulations, and by extracting mass derivatives from the correlation functions. We do not find much improvement in the nucleon to [rho] mass ratio as we decrease the quark mass at this lattice spacing. Finally, we report on an unsuccessful attempt to see effects of the [rho][r arrow]2[pi] decay on the [rho] mass, and on studies of Wilson and Kogut-Susskind hadron masses with large valence quark masses.

• DOE Contract Number: FG02-91ER40628; AC02-84ER40125; AC02-86ER40253; FG02-85ER40213
• OSTI ID: 5926486
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 48:9; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUANTUM CHROMODYNAMICS
SPECTRA
CHIRAL SYMMETRY
COUPLING
FLAVOR
LATTICE FIELD THEORY
MASS
QUARKS
SIZE
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
ORGANOLEPTIC PROPERTIES
POSTULATED PARTICLES
QUANTUM FIELD THEORY
SYMMETRY
662230* - Quantum Chromodynamics- (1992-)
662110 - General Theory of Particles & Fields- Theory of Fields & Strings- (1992-)