Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-11-02
PoS LAT2009:165,2009
Physics
High Energy Physics
High Energy Physics - Lattice
To appear in the proceedigns of 27th International Symposium on Lattice Field Theory (Lattice 2009), Beijing, China, 25-31 Jul
Scientific paper
The free energy between a static quark and an antiquark is studied by using the color-singlet Polyakov-line correlation at finite temperature. We perform simulations on $32^3 \times 12$, 10, 8, 6, 4 lattices in the high temperature phase with the RG-improved gluon action and 2+1 flavors of the clover-improved Wilson quark action. Since the simulations are based on the fixed scale approach that the temperature can be varied without changing the spatial volume and renormalization factor, it is possible to investigate temperature dependence of the heavy-quark free energy without any adjustment of the overall constant. We find that, the heavy-quark free energies at short distance converge to the heavy-quark potential evaluated from the Wilson-loop operator at zero temperature, in accordance with the expected insensitivity of short distance physics to the temperature. At long distance, the heavy-quark free energies approach to twice the single-quark free energies, implying that the interaction between heavy quarks is screened. The Debye screening mass obtained from the long range behavior of the heavy-quark free energy is compared with results of the thermal perturbation theory and those of $N_f=2$ and $N_f=0$ lattice simulations.
Aoki Sadao
Ejiri Shinji
Hatsuda Tetsuo
Kanaya Kazuyuki
Maezawa Yuu
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