Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-12-10
Phys.Rev. C59 (1999) 3343-3356
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, 11 PostScript figures, ReVTeX
Scientific paper
10.1103/PhysRevC.59.3343
Chemically non-equilibrated quark-antiquark matter is studied within the Nambu-Jona-Lasinio model. The equations of state of non-strange (q=u,d) and strange (q=s) quark-antiquark systems are calculated in the mean-field approximation. The existence of metastable bound states with zero pressure is predicted at finite densities and temperatures less than about 50 MeV. It is shown that the minimum energy per particle occurs for symmetric systems, with equal densities of quarks and antiquarks. At T=0 these metastable states have quark number densities of about 0.5 fm^-3 for q=u,d and of 1 fm^-3 for q=s. A first order chiral phase transition is found at finite densities and temperatures. The critical temperature for this phase transition is approximately 75 MeV (90 MeV) for the non-strange (strange) baryon-free quark-antiquark matter. For realistic choices of parameters, the model does not predict the phase transition in chemically equilibrated systems. Possible decay channels of the metastable quark-antiquark droplets and their signatures in relativistic heavy-ion collisions are discussed.
Greiner Walter
Mishustin Igor N.
Satarov L. M.
Stoecker Horst
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