Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-07-15
Nucl.Phys.A661:140-149,1999
Physics
Nuclear Physics
Nuclear Theory
10 pages LaTeX, including 5 figures. Invited overview talk given at Quark Matter '99, Torino, Italy, May 10-15, 1999. To appea
Scientific paper
10.1016/S0375-9474(99)85016-7
The present status of soft hadron production in high energy heavy-ion collisions is summarized. In spite of strong evidence for extensive dynamical evolution and collective expansion of the fireball before freeze-out I argue that its chemical composition is hardly changed by hadronic final state interactions. The measured hadron yields thus reflect the primordial conditions at hadronization. The observed production pattern is consistent with statistical hadronization at the Hagedorn temperature from a state of uncorrelated, color deconfined quarks and antiquarks, but requires non-trivial chemical evolution of the fireball in a prehadronic (presumably QGP) stage before hadron formation.
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