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

TL;DR

This paper uses the Quark-Gluon String Model to analyze event-by-event fluctuations in heavy-ion collisions, comparing model predictions with experimental data and exploring implications for equilibration and dynamical effects at high energies.

Contribution

It introduces a new fluctuation variable and demonstrates that the QGSM accurately reproduces experimental fluctuation results, advancing understanding of heavy-ion collision dynamics.

Findings

The new fluctuation variable aligns with experimental data.

QGSM successfully reproduces NA49 fluctuation results.

Predictions are made for future collisions at RHIC and higher energies.

Abstract

We apply dynamical string models of heavy-ions collisions at high energies to the analysis of event-by-event fluctuations. Main attention is devoted to a new variable proposed to study "equilibration" in heavy-ions 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.