Color screening potential at finite density in two-flavor lattice QCD with Wilson fermion
Color screening potential at finite density in two-flavor lattice QCD with Wilson fermion
复制标题
威尔逊费米子在二味晶格 QCD 中有限密度下的颜色筛选潜力
DOI：
10.1103/physrevd.88.114504
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发表时间：
2013
影响因子：
5
通讯作者：
and Masanobu Yahiro
中科院分区：
文献类型：
--
作者：
Junichi Takahashi;Keitaro Nagata;Takuya Saito;Atsushi Nakamura;Takahiro Sasaki;Hiroaki Kouno;and Masanobu Yahiro
We investigate the chemical-potential () dependence of static-quark free energies in both the real and imaginaryregions, performing lattice QCD simulations at imaginaryand extrapolating the results to the real-region with analytic continuation. Lattice QCD calculations are done on alattice with the clover-improved two-flavor Wilson fermion action and the renormalization-group-improved Iwasaki gauge action. Static-quark potentials are evaluated from the Polyakov-loop correlation functions in the deconfinement phase. To perform the analytic continuation, the potential calculated at imaginaryis expanded into a Taylor expansion series ofup to fourth order and the pure imaginary variableis replaced by the real one. At real, the fourth-order term sizably weakens thedependence of the potential. At long distance, all of the color-singlet and -nonsinglet potentials tend to twice the single-quark free energy, indicating that the interactions between static quarks are fully color screened for finite. For both real and imaginary, the color-singletand the color-antitripletinteractions are attractive, whereas the color-octetand the color-sextetinteractions are repulsive. The attractive interactions have a strongerdependence than the repulsive interactions. The color-Debye screening mass is extracted from the color-singlet potential at imaginary, and the mass is extrapolated to realby analytic continuation. The screening mass thus obtained has a strongerdependence than the prediction of hard-thermal-loop perturbation theory at both real and imaginary.
