Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-01-10
Eur.Phys.J. A17 (2003) 103-110
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 23 pages, 7 figures, new references and discussion added, typos corrected
Scientific paper
10.1140/epja/i2003-10003-9
The phase diagram for quark matter is investigated within a simple Nambu-Jona-Lasinio model without vector correlations. It is found that the phase structure in the temperature-density plane depends sensitively on the parametrization of the model. We present two schemes of parametrization of the model where within the first one a first order phase transition from a phase with broken chiral symmetry to a color superconducting phase for temperatures below the triple point at T_t= 55 MeV occurs whereas for the second one a second order phase transition for temperatures below T_t = 7 MeV is found. In the latter case, there is also a coexistence phase of broken chiral symmetry with color superconductivity, which is a new finding within this class of models. Possible consequences for the phenomenology of the QCD phase transition at high baryon densities are discussed.
Blaschke David
Volkov Mikhail K.
Yudichev V. L.
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