Thermal and Nonthermal Pion Enhancements with Chiral Symmetry Restoration

Details Thermal and Nonthermal Pion Enhancements with Chiral Symmetry Restoration Thermal and Nonthermal Pion Enhancements with Chiral Symmetry Restoration

2000-08-23

arxiv.org/abs/nucl-th/0008044v2

Phys.Rev. D63 (2001) 016004

Physics

Nuclear Physics

Nuclear Theory

Latex2e, 12 pages, 8 Postscript figures, submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.63.016004

The pion production by sigma decay and its relation with chiral symmetry restoration in a hot and dense matter are investigated in the framework of the Nambu-Jona-Lasinio model. The decay rate for the process sigma -> 2pion to the lowest order in a 1/N_c expansion is calculated as a function of temperature T and chemical potential mu. The thermal and nonthermal enhancements of pions generated by the decay before and after the freeze-out present only in the crossover region of the chiral symmetry transition. The strongest nonthermal enhancement is located in the vicinity of the endpoint of the first-order transition.

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