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arXiv 1104.0873hep-ph
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Dressed Polyakov环和味相关相变

Dressed Polyakov loop and flavor dependent phase transitions

Fukun Xu, Hong Mao, Tamal K. Mukherjee, Mei Huang

摘要:

在Nf = 2+1的Nambu-Jona-Lasinio(NJL)模型框架下,研究了有限温度和密度下的手征凝聚体和缀饰Polyakov圈.在具有物理夸克质量的显手征对称性破缺情况下,发现轻u,d夸克和s夸克的相变是依次发生的,并且随着重子密度的增加,不同味的跃迁线之间的间隔越来越宽.对于每种味,手征凝聚体和修饰Polyakov圈的赝临界温度在较低的重子密度区有一个很窄的跃迁范围,而在较高的重子密度区这两个跃迁是一致的.

英文摘要:

The chiral condensate and dressed Polyakov loop at finite temperature and density have been investigated in the framework of Nf = 2+1 Nambu-Jona-Lasinio (NJL) model with two degenerate u, d quarks and one strange quark. In the case of explicit chiral symmetry breaking with physical quark masses, it is found that the phase transitions for light u, d quarks and s quark are sequentially happened, and the separation between the transition lines for different flavors becomes wider and wider with the increase of baryon density. For each flavor, the pseudo-critical temperatures for chiral condensate and dressed Polyakov loop differ in a narrow transition range in the lower baryon density region, and the two transitions coincide in the higher baryon density region.

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