出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：A thermal hadronic model including two different temperatures to describe the freeze out of the expanding fireball in a ultrarelativistic heavy ion collision is presented. We introduced distinct effective freeze out temperatures for the baryonic and mesonic sectors of expanding fireball. The model is applied to determine and to fit particle population ratios of hadrons produced in the reaction. The proposal is not merely incorporate one additional degree of freedom to the adjustment procedure of data within thermal model, but to stress out a different scenario for the freeze out stage in the collisional process. The reformulated version of thermal model was applied to a set of consolidated data in the literature, offering a rather good improvement in the fitting quality of calculated particle ratios to the data.
