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arXiv 0907.4203hep-lat
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Wilson型夸克action全QCD格点模拟中重夸克的自由能

Free energies of heavy quarks in full-QCD lattice simulations with Wilson-type quark action

Y. Maezawa, S. Aoki, S. Ejiri, T. Hatsuda, N. Ishii, K. Kanaya, H. Ohno, T. Umeda

摘要:

在改进的Wilson夸克2+1味的格点量子色动力学中,利用有限温度下的色单态Polyakov线关联研究了静态夸克与反夸克之间的自由能.通过对$32^3 \times 12$,10,8,6,4格点在高温相的模拟,基于固定标度方法,我们发现,与短程物理对温度的不敏感性相一致,短程重夸克自由能收敛于由威尔逊圈计算的零温重夸克势.在远距离下,重夸克自由能接近单夸克自由能的两倍,表明重夸克之间的相互作用是屏蔽的。由自由能的长程行为得到的德拜屏蔽质量与热微扰理论的结果进行了比较。

英文摘要:

The free energy between a static quark and an antiquark is studied by using the color-singlet Polyakov-line correlation at finite temperature in lattice QCD with 2+1 flavors of improved Wilson quarks. From the simulations on $32^3 \times 12$, 10, 8, 6, 4 lattices in the high temperature phase, based on the fixed scale approach, we find that, the heavy-quark free energies at short distance converge to the heavy-quark potential evaluated from the Wilson loop 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 free energy is compared with the results of thermal perturbation theory.

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