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arXiv 0708.0299hep-lathep-ph
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猝灭格点量子色动力学中T_c以上夸克的光谱性质

Spectral properties of quarks above T_c in quenched lattice QCD

Frithjof Karsch, Masakiyo Kitazawa

摘要:

我们用Clover改进的Wilson费米子在Landau规范下分析了猝灭格点量子色动力学中在临界温度以上的夸克谱函数。我们表明,时间夸克相关很好地再现了谱函数的两极近似,并分析了裸夸克质量依赖的两极以及它们的残留物。在手征极限下,我们发现夸克谱函数有两个集体模,分别对应于正常激发和等离子体激发。在大的裸夸克质量值的谱函数是由一个单极占主导地位。

英文摘要:

We analyze the quark spectral function above the critical temperature for deconfinement in quenched lattice QCD using clover improved Wilson fermions in Landau gauge. We show that the temporal quark correlator is well reproduced by a two-pole approximation for the spectral function and analyze the bare quark mass dependence of both poles as well as their residues. In the chiral limit we find that the quark spectral function has two collective modes which correspond to the normal and plasmino excitations. At large values of the bare quark mass the spectral function is dominated by a single pole.

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