Static quark-antiquark free energy and the running coupling at finite temperature

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.70.074505· OSTI ID:20705362

Kaczmarek, O; Zantow, F; Petreczky, P ^[1]

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1. Fakultaet fuer Physik, Universitaet Bielefeld, P. O. Box 100131, D-33501 Bielefeld (Germany)

We analyze the free energy of a static quark-antiquark pair in quenched QCD at short and large distances. From this we deduce running couplings, g{sup 2} (r, T), and determine the length scale that separates at high temperature the short distance perturbative regime from the large distance nonperturbative regime in the QCD plasma phase. Ambiguities in the definition of a coupling beyond the perturbative regime are discussed in their relation to phenomenological considerations on heavy quark bound states in the quark gluon plasma. Our analysis suggests that it is more appropriate to characterize the nonperturbative properties of the QCD plasma phase close to T{sub c} in terms remnants of the confinement part of the QCD force rather than a strong Coulombic force.

• OSTI ID: 20705362
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 70; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
BAG MODEL
BOUND STATE
C QUARKS
COUPLING
COUPLING CONSTANTS
DISTANCE
FREE ENERGY
GAUGE INVARIANCE
LATTICE FIELD THEORY
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
QUARK MATTER
QUARK-ANTIQUARK INTERACTIONS
SU-3 GROUPS
T QUARKS