Universality, the QCD critical/tricritical point and the quark number susceptibility

Details Universality, the QCD critical/tricritical point and the quark number susceptibility Universality, the QCD critical/tricritical point and the quark number susceptibility

2002-10-21

arxiv.org/abs/hep-ph/0210284v2

Phys.Rev. D67 (2003) 014028

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 10 figures

Scientific paper

10.1103/PhysRevD.67.014028

The quark number susceptibility near the QCD critical end-point (CEP), the tricritical point (TCP) and the O(4) critical line at finite temperature and quark chemical potential is investigated. Based on the universality argument and numerical model calculations we propose a possibility that the hidden tricritical point strongly affects the critical phenomena around the critical end-point. We made a semi-quantitative study of the quark number susceptibility near CEP/TCP for several quark masses on the basis of the Cornwall-Jackiw-Tomboulis (CJT) potential for QCD in the improved-ladder approximation. The results show that the susceptibility is enhanced in a wide region around CEP inside which the critical exponent gradually changes from that of CEP to that of TCP, indicating a crossover of different universality classes.

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