Quark self-energy beyond the mean field at finite temperature.
Quark self-energy beyond the mean field at finite temperature.
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DOI：
10.1103/physrevc.51.2256
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发表时间：
1995-04
期刊：
影响因子：
--
通讯作者：
Zhuang
中科院分区：
文献类型：
--
作者：
Zhuang
Nambu--Jona-Lasinio 模型是一种有效的 QCD 低能模型，在有限温度和密度下，可扩展到 1/${\mathit{N}}_{\mathit{c}}$ 展开式的下一个主导阶。在关于平均场的微扰方法中考虑了介子敷料对夸克自能和组成夸克质量的贡献。特别是，夸克质量的温度依赖性在零化学势下以数值方式显示。与低温下的主序结果相比，介子修整对夸克质量的修正达到20%，并且在高温下迅速接近于零。
The Nambu--Jona-Lasinio model, an effective low-energy model of QCD, is extended to the next to the leading order in the 1/${\mathit{N}}_{\mathit{c}}$ expansion at finite temperature and density. The contributions to the quark self-energy and the constituent quark mass from the meson dressing are considered in a perturbative approach about the mean field. In particular, the temperature dependence of the quark mass is shown numerically at zero chemical potential. The correction to the quark mass from the meson dressing amounts to 20% compared to the result of the leading order at low temperature, and rapidly approaches zero at high temperature.