Sigma Decay at Finite Temperature and Density
P. Zhuang, Z. Yang
Abstract
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/Nc expansion is calculated as a function of temperature T and baryon density nb. 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.
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