Continuum study of quark-number susceptibility in an effective interaction model
Continuum study of quark-number susceptibility in an effective interaction model
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有效相互作用模型中夸克数敏感性的连续研究
DOI：
10.1103/physrevd.76.076005
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发表时间：
2007-10
影响因子：
5
通讯作者：
Sun, Wei-min
中科院分区：
文献类型：
--
作者：
Feng, Hong-tao;Zong, Hong-shi;He, Min;He, Deng-ke;Sun, Wei-min
在忽略矢量通道中u、d夸克味混合的近似下，基于外场方法导出了夸克数磁化率的计算公式。在非相互作用情况下，该公式证明了夸克数磁化率的费米统计结果。然后在有效相互作用模型下利用Dyson-Schwinger方程进行了计算，发现在低温下它为零，并在相变点附近急剧上升到非零值，这与以前的格点QCD结果一致。这种行为的夸克数磁化率的手征对称性恢复和解除禁闭的信号的解释进行了讨论。
In the approximation of neglecting the flavor mixing between u and d quarks in the vector channel, we derive a formula for the quark-number susceptibility based on the external field method. This formula proves to yield exactly the Fermi statistics result of the quark-number susceptibility in the noninteracting situation. Then calculation in an effective interaction model via Dyson-Schwinger equations is performed and it is found that at low temperatures it is zero and it rises sharply to nonzero values across the phase transition point, which is consistent with previous lattice QCD results. The interpretation of this behavior of the quark-number susceptibility as a signal of chiral symmetry restoration and deconfinement is discussed.