QCD PHASE-TRANSITION IN MULTIPARTICLE ENVIRONMENT

Chiral QCD phase transition is examined in the environment of relativi stic nuclear collisions. The effective potential, at T = T-c, of the O (4) universality class is used in order to formulate the Statistical M echanics of primordial hadrons (masseless pions and sigmas) produced i n heavy ion collisions. Critical fluctuations in rapidity space are re vealed and their universal properties identified. A Monte Carlo simula tion of the corresponding events (critical events) shows that the pred ictions of the theory are accessible to experimental observation.