Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-09-11
Nucl.Phys. A703 (2002) 770-784
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 5 figures; v2: figure 2 of v1 removed, some changes in the discussion, references added
Scientific paper
10.1016/S0375-9474(01)01674-8
The phase diagram of strongly interacting matter at non-zero temperature and baryon chemical potential is calculated within a 3-flavor NJL-type quark model with realistic quark masses. The model exhibits spontaneous chiral symmetry breaking as well as diquark condensation in the two-flavor color-superconducting phase and in the color-flavor locked phase. We investigate the color-flavor unlocking phase transition, taking into account self-consistently calculated effective quark masses. We find that it is mainly triggered by a first order phase transition with respect to the strange quark mass. It takes place at much higher values of the chemical potential than the transition to the hadronic phase such that we find a relatively large region in the phase diagram where the two-flavor color-superconductor seems to be the most favored state.
Buballa Michael
Oertel Micaela
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