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

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          Abstract

          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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          Author and article information

          Journal
          21 October 2002
          2003-02-20
          Article
          10.1103/PhysRevD.67.014028
          hep-ph/0210284
          c9ed9fdc-a5e4-4aa0-ad8a-6c610579eb06
          History
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          Phys.Rev. D67 (2003) 014028
          18 pages, 10 figures
          hep-ph

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