Heavy-quark free energy, Debye mass, and spatial string tension at finite temperature in two flavor lattice QCD with Wilson quark action

Journal Article · Sun Apr 01 00:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.074501· OSTI ID:21020292

Maezawa, Y; Hatsuda, T ^[1]; Ukita, N; Ishii, N ^[2]; Aoki, S ^[3]; Ejiri, S ^[4]; Kanaya, K ^[3]

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1. Department of Physics, The University of Tokyo, Tokyo 113-0033 (Japan)
2. Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577 (Japan)
3. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571 (Japan)
4. Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)

We study Polyakov loop correlations and spatial Wilson loop at finite temperature in two-flavor QCD simulations with the RG-improved gluon action and the clover-improved Wilson quark action on a 16{sup 3}x4 lattice. From the line of constant physics at m{sub PS}/m{sub V}=0.65 and 0.80, we extract the heavy-quark free energies, the effective running coupling g{sub eff}(T) and the Debye screening mass m{sub D}(T) for various color channels of heavy quark-quark and quark-antiquark pairs above the critical temperature. The free energies are well approximated by the screened Coulomb form with the appropriate Casimir factors at high temperature. The magnitude and the temperature dependence of the Debye mass are compared to those of the next-to-leading-order thermal perturbation theory and to a phenomenological formula in terms of g{sub eff}(T). We make a comparison between our results with the Wilson quark action and the previous results with the staggered quark action. The spatial string tension is also studied in the high temperature phase and is compared to the next-to-next-leading-order prediction in an effective theory with dimensional reduction.

• OSTI ID: 21020292
• Journal Information: Physical Review. D, Particles Fields, Vol. 75, Issue 7; Other Information: DOI: 10.1103/PhysRevD.75.074501; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACTION INTEGRAL
B QUARKS
C QUARKS
COLOR MODEL
COMPARATIVE EVALUATIONS
CORRELATIONS
COUPLING
CRITICAL TEMPERATURE
FLAVOR MODEL
FREE ENERGY
GLUONS
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
QUARK-ANTIQUARK INTERACTIONS
REST MASS
T QUARKS
TEMPERATURE DEPENDENCE
WILSON LOOP