Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-08-23
Chin.Phys.Lett. 18 (2001) 344-346
Physics
Nuclear Physics
Nuclear Theory
6 pages, 3 Postscript figures, submitted to Chin. Phys. Lett
Scientific paper
10.1088/0256-307X/18/3/311
Sigma decay and its relation with chiral phase transition are discussed at finite temperature and density in the framework of the Nambu-Jona-Lasinio model. The decay rate for the process sigma -> 2 pions to first order in a 1/N_c expansion is calculated as a function of temperature T and baryon density n_b. In particular, only when the chiral phase transition happens around the tricritical point, the sigma decay results in a non-thermal enhancement of pions in the final state distributions in relativistic heavy ion collisions.
Yang Zeping
Zhuang Peng-fei
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