Event-By-Event Fluctuation of Maximum Particle Density in Narrow Pseudo-Rapidity Interval at a Few AGeV/c

TL;DR

This study investigates the fluctuations in maximum particle density in narrow pseudo-rapidity intervals during high-energy nuclear collisions, revealing significant fluctuations that are not reproduced by the UrQMD model.

Contribution

It provides a detailed experimental analysis of event-by-event fluctuations in particle density and compares these with UrQMD simulations, highlighting discrepancies.

Findings

Scaled variance indicates strong fluctuations in particle density.

Fluctuations decrease with increasing pseudo-rapidity interval.

UrQMD model fails to replicate experimental fluctuation patterns.

Abstract

A detailed study of event by event fluctuation of maximum particle density of the produced particles in narrow pseudo-rapidity interval in terms of the scaled variance {\omega} has been carried out for 16O-AgBr, 28Si-AgBr and 32S-AgBr interactions at an incident momentum of 4.5 AGeV/c. For all the interactions the values of scaled variance are found to be greater than zero indicating the presence of strong event by event fluctuation of maximum particle density values in the multiparticle production process. The event by event fluctuations are found to decrease with the increase of pseudo-rapidity interval. Experimental analysis has been compared with the results obtained from the analysis of events simulated by the Ultra Relativistic Quantum Molecular Dynamics (UrQMD) model. UrQMD model could not replicate the experimental results.