Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-09-12
Phys.Rev.D75:065004,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 9 figures, version to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.75.065004
We investigate the properties of scalar and pseudo-scalar mesons at finite temperature and quark chemical potential in the framework of the Nambu-Jona-Lasinio (NJL) model coupled to the Polyakov loop (PNJL model) with the aim of taking into account features of both chiral symmetry breaking and deconfinement. The mesonic correlators are obtained by solving the Schwinger-Dyson equation in the RPA approximation with the Hartree (mean field) quark propagator at finite temperature and density. In the phase of broken chiral symmetry a narrower width for the sigma meson is obtained with respect to the NJL case; on the other hand, the pion still behaves as a Goldstone boson. When chiral symmetry is restored, the pion and sigma spectral functions tend to merge. The Mott temperature for the pion is also computed.
Alberico Wanda M.
Beraudo Andrea
Hansen Hebert
Molinari Anna
Nardi Marzia
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