Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2006-10-02
PoSLAT2006:141,2006
Physics
High Energy Physics
High Energy Physics - Lattice
7 pages, 9 figures, talk given at Lattice 2006 (high temperature and density)
Scientific paper
Polyakov loop correlations at finite temperature in two-flavor QCD are studied in lattice simulations with the RG-improved gluon action and the clover-improved Wilson quark action. From the simulations on a $16^3 \times 4$ lattice, we extract the free energies, the effective running coupling $g_{\rm eff}(T)$ and the Debye screening mass $m_D(T)$ for various color channels of heavy quark--quark and quark--anti-quark pairs above the critical temperature. The free energies are well approximated by the screened Coulomb form with the appropriate Casimir factors. 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 given in terms of $g_{\rm eff}(T)$. Also we made a comparison between our results with the Wilson quark and those with the staggered quark previously reported.
Aoki Sadao
Ejiri Shinji
Hatsuda Tetsuo
Ishii Naohiro
Kanaya Kazuyuki
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