Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions
- 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.
Author: | Francesco BecattiniORCiDGND, Jaakko Manninen, Marek GaździckiORCiD |
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URN: | urn:nbn:de:hebis:30-27860 |
ArXiv Id: | http://arxiv.org/abs/hep-ph/0511092 |
Document Type: | Preprint |
Language: | English |
Date of Publication (online): | 2006/06/14 |
Year of first Publication: | 2005 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Release Date: | 2006/06/14 |
Source: | http://arxiv.org/abs/hep-ph/0511092, Version 3 vom 1 Dez. 2005 |
HeBIS-PPN: | 190629614 |
Institutes: | Physik / Physik |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Licence (German): | ![]() |