MEAN-FIELD MODEL WITH EXCLUDED-VOLUME CORRECTION FOR A MULTICOMPONENTHADRON GAS

A phenomenological mean field formalism developed to incorporate the e xcluded volume correction arising due to a hard-core repulsion between a pair of baryons has been extended for a multicomponent hadron gas i nvolving strangeness degrees of freedom. The resulting equation of sta te (EOS) is used to study the medium modifications of the nucleon and hyperon masses with the temperature T and the chemical potential mu. T he variations of the effective masses of the baryons with respect to t he temperature at mu = 0 shows a striking difference from that obtaine d in the Walecka model for T> 150 MeV. Similar difference can also be noticed in the variations of the baryon density with temperature. (C) 1998 Elsevier Science B.V.