2008/08/31 by Bernd-Jochen Schaefer, Mathias Wagner, Μ. Wagner · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #hep-th #nucl-th
paper · pdf · doi:10.1103/physrevd.79.014018
published as Phys.Rev.D79:014018,2009 · 19 pages, 12 figures, 2 tables, RevTex4; revised version, accepted for publication in PRD
arxiv created 2008/11/18 · openalex publication_date 2009/01/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
Chiral symmetry restoration at nonzero temperature and quark densities are investigated in the framework of a linear sigma model with Nf=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 \ensuremathη\mathrm\text\ensuremath-\ensuremathη^\ensuremath' and scalar \ensuremathσ(600)\mathrm\text\ensuremath-f0(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 are 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.