Abstract
Chiral symmetry restoration at nonzero temperature is studied in the framework of the O (4) linear sigma model and the U(N f ) r × U (N f ) l linear sigma model with N f = 2, 3 and 4 quark flavors. We investigate the temperature dependence of the masses of the scalar and pseudoscalar mesons within the Hartree approximation as derived from the Cornwall-Jackiw-Tomboulis formalism. We find that the masses of the non-strange and strange mesons at nonzero temperature depend sensitively on the number of light quark flavors N f . On the other hand, due to the large charm quark mass, neither do charmed mesons significantly affect the properties of the other mesons, nor do their masses change appreciably in the temperature range around the chiral symmetry restoration temperature.
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