e-Article
Centrality dependence of the expansion dynamics in Pb-Pb collisions at 158 A GeV c-1
Document Type
Article
Author
Antinori, The WA97 Collaboration: F; Beusch, W; Bloodworth, I J; Bruno, G E; Caliandro, R; Carrer, N; Bari, D Di; Liberto, S Di; Elia, D; Evans, D; Fanebust, K; Fayazzadeh, F; Fini, R A; Ghidini, B; Grella, G; Helstrup, H; Henriquez, M; Holme, A K; Jacholkowski, A; Jones, G T; Kinson, J B; Knudson, K; Králik, I; Lenti, V; Lietava, R; Loconsole, R A; Løvhøiden, G; Manzari, V; Mazzoni, M A; Meddi, F; Michalon, A; Michalon-Mentzer, M E; Morando, M; Norman, P I; Pastircák, B; Quercigh, E; Röhrich, D; Romano, G
Source
Journal of Physics G: Nuclear and Particle Physics; October 1, 2001, Vol. 27 Issue: 11 p2325-2344, 20p
Subject
Language
ISSN
09543899; 13616471
Abstract
Two-particle correlation functions of negatively charged hadrons from Pb-Pb collisions at 158 GeV c-1 /nucleon have been measured by the WA97 experiment at the CERN SPS. A Coulomb correction procedure that assumes an expanding source has been implemented. Within the framework of an expanding thermalized source model the size and dynamical state of the collision fireball at freeze-out have been reconstructed as a function of the centrality of the collision. Less central collisions exhibit a different dynamics than central ones: both transverse and longitudinal expansion velocities are slower, the expansion duration is shorter and the system freezes out, showing smaller dimensions and higher temperature.