Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-11-08
Phys.Rev. C73 (2006) 044905
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 10 figures. References added and updated. Table corrected
Scientific paper
10.1103/PhysRevC.73.044905
We present a detailed study of chemical freeze-out in p-p, C-C, Si-Si and Pb-Pb collisions at beam momenta of 158A GeV as well as Pb-Pb collisions at beam momenta of 20A, 30A, 40A and 80A GeV. By analyzing hadronic multiplicities within the statistical hadronization model, we have studied the parameters of the source as a function of the number of the participating nucleons and the beam energy. We observe a nice smooth behaviour of temperature, baryon chemical potential and strangeness under-saturation parameter as a function of energy and nucleus size. Interpolating formulas are provided which allow to predict the chemical freeze-out parameters in central collisions at centre-of-mass energies > 4.5 GeV and for any colliding ions. Specific discrepancies between data and model emerge in particle ratios in Pb-Pb collisions at SPS between 20A and 40A GeV of beam energy which cannot be accounted for in the considered model schemes.
Becattini Francesco
Gazdzicki Marek
Manninen Jaakko
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