Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-12-08
Phys.Rev.D81:116005,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 4 figures, LaTeX, clarifying formulae included, detailed description of Pauli-Villars regularization leading to corr
Scientific paper
10.1103/PhysRevD.81.116005
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 the connection between the location of the endpoint in the phase diagram and the mechanism of chiral symmetry breaking at the quark level. We show how the 8q interactions affect the number of effective quark degrees of freedom. We are able to obtain the correct asymptotics for this number at large temperatures by using the Pauli-Villars regularization.
Blin Alex H.
Hiller Brigitte
Moreira Joao
Osipov Alexander A.
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