Eur. Phys. J. C (1999) 11: 163-167
https://doi.org/10.1007/s100529900168

Theoretical physics

Event-by-event fluctuations in heavy-ion collisions and the quark-gluon string model

Laboratoire de Physique Theorique, Unité Mixte de Recherche (CNRS) UMR 8627, Universite de Paris XI, Bat.210, 91405, Orsay Cedex, France
Institute of Theoretical and Experimental Physics, B. Cheremushinskaya 25, 117 259, Moscow, Russia

Received: 16 March 1999
Revised: 21 June 1999
Published online: 28 September 1999

Abstract

We apply dynamical string models of heavy-ion collisions at high energies to the analysis of event-by-event fluctuations. Attention is devoted mainly to a new variable proposed for studying “equilibration” in heavy-ion collisions. Recent results of the NA49 collaboration at CERN SPS are compared with predictions of the quark-gluon string model (QGSM), which gives a good description of different aspects of multiparticle production for collisions of nucleons and nuclei. It is shown that the new observable and other results of the NA49 analysis of event-by-event fluctuations are correctly reproduced in the model. We discuss dynamical effects responsible for these fluctuations and give the predictions for p-p, p-Pb and Pb-Pb collisions at RHIC and higher energies.