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arXiv 1001.3565hep-ph
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SU中的phase diagram(3)具有t Hooft和八夸克相互作用的Nambu-Jona-Lasinio模型

The phase diagram in the SU(3) Nambu-Jona-Lasinio model with 't Hooft and eight-quark interactions

J. Moreira, B. Hiller, A. A. Osipov, A. H. Blin

摘要:

结果表明,在Nambu-Jona-Lasinio模型的相图中,一阶跃迁线的端点合并成一个交叉区,并扩展到包括六夸克t Hooft和八夸克相互作用的拉格朗日量,随着违反OZI的八夸克相互作用强度的增加,一阶跃迁线的端点被推向消失的化学势和更高的温度.我们阐明了相图中端点的位置与夸克水平上手征对称性破缺机制之间的联系。解释了基于基态稳定性和物理考虑的耦合强度的约束。

英文摘要:

It is shown that the endpoint of the first order transition line which merges into a crossover regime in the phase diagram of the Nambu--Jona-Lasinio model, extended to include the six-quark 't Hooft and eight-quark interaction Lagrangians, is pushed towards vanishing chemical potential and higher temperatures with increasing strength of the OZI-violating eight-quark interactions. We clarify a connection between the location of the endpoint in the phase diagram and the mechanism of chiral symmetry breaking at the quark level. Constraints on the coupling strengths based on groundstate stability and physical considerations are explained.

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