Static quark-antiquark interactions in zero and finite temperature QCD: I. Heavy quark free energies, running coupling, and quarkonium binding

Journal Article · Wed Jun 01 04:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.114510· OSTI ID:20709474

Kaczmarek, Olaf; Zantow, Felix ^[1]

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1. Fakultaet fuer Physik, Universitaet Bielefeld, D-33615 Bielefeld (Germany)

We analyze heavy quark free energies in 2-flavor QCD at finite temperature and the corresponding heavy quark potential at zero temperature. Static quark-antiquark sources in color singlet, octet and color averaged channels are used to probe thermal modifications of the medium. The temperature dependence of the running coupling, {alpha}{sub qq}(r,T), is analyzed at short and large distances and is compared to zero temperature as well as quenched calculations. In part, we also compare our results to recent findings in 3-flavor QCD. We find that the characteristic length scale below which the running coupling shows almost no temperature dependence is almost twice as large as the Debye screening radius. Our analysis supports recent findings which suggest that {chi}{sub c} and {psi}{sup '} are suppressed already at the (pseudo) critical temperature and thus give a probe for quark gluon plasma production in heavy ion collision experiments, while J/{psi} may survive the transition and will dissolve at higher temperatures.

• OSTI ID: 20709474
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 11 Vol. 71; 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
C QUARKS
COLOR MODEL
COMPARATIVE EVALUATIONS
COUPLING
CRITICAL TEMPERATURE
DISTANCE
FLAVOR MODEL
FREE ENERGY
HEAVY ION REACTIONS
J PSI-3097 MESONS
POTENTIALS
QUANTUM CHROMODYNAMICS
QUARK MATTER
QUARK-ANTIQUARK INTERACTIONS
RESONANCE PARTICLES
T QUARKS
TEMPERATURE DEPENDENCE