On the early stage of nucleus-nucleus collisions

  • A statistical model of the early stage of central nucleus--nucleus (A+A) collisions is developed. We suggest a description of the confined state with several free parameters fitted to a compilation of A+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 central nucleus--nucleus collisions at the SPS. This result is in quantitative agreement with existing SPS data on pion and strangeness production and gives a natural explanation for their scaling behaviour. The localization and the properties of the transition region are discussed. It is shown that the deconfinement transition can be detected by observation of the characteristic energy dependence of pion and strangeness multiplicities, and by an increase of the event--by--event fluctuations. An attempt to understand the data on J/psi production in Pb+Pb collisions at the SPS within the same approach is presented.

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Author:Marek GaździckiORCiD, Mark I. GorensteinORCiDGND
ArXiv Id:http://arxiv.org/abs/hep-ph/9803462v3
Parent Title (German):IKF–HENPG ; 2–98
Series (Serial Number):IKF–HENPG (2–98)
Publisher:Institut für Kernphysik, Goethe-Universität Frankfurt
Place of publication:Frankfurt am Main
Document Type:Working Paper
Date of Publication (online):1998/10/30
Date of first Publication:1998/10/30
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/09/30
Edition:version 3
Page Number:39
Source:Acta Phys.Polon. B30 (1999), http://arxiv.org/abs/hep-ph/9803462
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht