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arXiv 2103.09426hep-ph
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有限温度下核介质中QCD手征凝聚体和赝标介子性质

QCD chiral condensate and pseudoscalar-meson properties in the nuclear medium at finite temperature

Parada T. P. Hutauruk, Seung-il Nam

摘要:

在Nambu-Jona-Lasinio(NJL)模型中,利用本征时间正则化(PTR)方法模拟了非零温度下核介质中的π介子和K介子性质,以及不同重子密度下有磁场存在时的QCD手征凝聚体.利用夸克-介子耦合(QMC)模型,在夸克水平上得到了对称核物质中夸克质量的密度依赖关系,该模型与NJL模型具有相同的协变特性。然后我们分析了有限温度和磁场下不同重子密度的QCD手征凝聚体和动力学质量,以及有限温度下不同重子密度的π介子和K介子质量、π介子和K介子弱衰变常数、π介子和K介子夸克耦合常数和波函数重整化因子。我们发现,QCD手征凝聚体随温度和重子密度的增加而抑制,在磁场存在下增强,这与其他模型的预测是一致的。有趣的是,发现π介子和K介子的波函数重整化因子随温度的升高而增大,随重子密度的增加而减小。

英文摘要:

The pion and kaon properties in a nuclear medium at nonvanishing temperature as well as the QCD chiral condensate in the presence of a magnetic field for various baryon densities are studied in the Nambu-Jona-Lasinio (NJL) model with the help of the proper-time regularization (PTR) scheme, simulating a QCD confinement. The density dependent of the quark mass in symmetric nuclear matter is obtained from the quark-meson coupling (QMC) model, which shares the same covariant feature with the NJL model, at quark level. We then analyze the QCD chiral condensates, and dynamical masses for various baryon densities at finite temperature and magnetic field as well as the pion and kaon masses, pion and kaon weak-decay constants, pion-and kaon-quark coupling constants, and wave function renormalization factors for various baryon densities at finite temperature. We find that the QCD chiral condensates suppress with increasing temperature and baryon density and enhance under the presence of a magnetic field, which are consistent with other model predictions. Interestingly, the wave function renormalization factors for the pion and kaon increase with respect to temperature and reduce as the baryon density increases are found.

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