On the early stage of nucleus-nucleus collisions

Citation
M. Gazdzicki et Mi. Gorenstein, On the early stage of nucleus-nucleus collisions, ACT PHY P B, 30(9), 1999, pp. 2705-2735
Citations number
51
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
ACTA PHYSICA POLONICA B
ISSN journal
0587-4254 → ACNP
Volume
30
Issue
9
Year of publication
1999
Pages
2705 - 2735
Database
ISI
SICI code
0587-4254(199909)30:9<2705:OTESON>2.0.ZU;2-0
Abstract
A statistical model of the early stage of central nucleus-nucleus (A+A) col lisions is developed. We suggest a description of the confined state with s everal free parameters fitted to a compilation of AS-A data at the AGS. For the deconfined state a simple Bag model equation of state is assumed. The model leads to the conclusion that a Quark Gluon Plasma is created in centr al nucleus-nucleus collisions at the SPS. This result is in quantitative ag reement with existing SPS data on pion and strangeness production and gives a natural explanation for their scaling behaviour. The localization and th e properties of the transition region are discussed. It is shown that the d econfinement transition can be detected by observation of the characteristi c energy dependence of pion and strangeness multiplicities, and by an incre ase of the event-by-event fluctuations. An attempt to understand the data o n J/psi, production in Pb+Pb collisions at the SPS within the same approach is presented.