Hadron spectra and quark-gluon plasma hadronization inAu+Aucollisions at relativistic energies

Recent measurements [1] of the energy dependence of pion and kaon production in central collisions of heavy nuclei (A+A) indicate [2] that the transient state of deconfined matter is created at the early stage of these collisions for energies higher than about 40 A·GeV, i.e. at high SPS and RHIC energies. Analysis of the hadron multiplicities measured in these collisions within statistical models at the SPS [3] and RHIC [4] energies shows that the chemical freeze–out takes place near the boundary between the quark–gluon and hadron phases. The values of the temperature parameter extracted from the data are similar for both energies, TH = 170 ± 10 MeV, and they are close to the value of the deconfinement transition temperature at zero baryonic density estimated in the lattice QCD (see e.g. Ref. [5]).

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