DOI 10.1007/s100529900012
On local and global equilibrium in heavy ion collisions
J. Sollfrank
Institut für Theoretische Physik, D-93040 Universität Regensburg, Germany
Received: 27 November 1998 / Revised version: 13 January 1999 / Published online: 11 March 1999
Abstract
The thermal model is commonly used in two different ways for the
description of hadron production in ultra-relativistic heavy
ion collision. One is the application of the thermal model to 
integrated data and the other is the thermal description of central dN/dy
ratios. While the first method implicitly assumes global
equilibrium the other scenario assumes Bjorken scaling within the
investigated rapidity range. Both assumptions are only approximations
for real physical collision systems. We study the impact of both
approximations for the extraction of thermal parameters on the exemplary
case of S+S collisions at SPS energies. The particle distributions
are modeled by a hydrodynamical description of the relevant collision
system.
Copyright Springer-Verlag
