The three-flavor chiral phase structure in hot and dense QCD matter

Details The three-flavor chiral phase structure in hot and dense QCD matter The three-flavor chiral phase structure in hot and dense QCD matter

2008-08-11

arxiv.org/abs/0808.1491v2

Phys.Rev.D79:014018,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 12 figures, 2 tables, RevTex4; revised version, accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.79.014018

Chiral symmetry restoration at nonzero temperature and quark densities are investigated in the framework of a linear sigma model with N_f=3 light quark flavors. After the derivation of the grand potential in mean-field approximation, the nonstrange and strange condensates, the in-medium masses of the scalar and pseudoscalar nonets are analyzed in hot and dense medium. The influence of the axial anomaly on the nonet masses and the isoscalar mixings on the pseudoscalar \eta-\eta' and scalar \sigma(600)-f_0(1370) complex are examined. The sensitivity of the chiral phase transition as well as the existence and location of a critical end point in the phase diagram on the value of the sigma mass is explored. The chiral critical surface with and without the influence of the axial U(1)_A anomaly is elaborated as a function of the pion and kaon masses for several values of the sigma mass.

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