Event by Event analysis of Maximum Pseudo-rapidity Gap Fluctuation in High energy Nucleus-nucleus Collisions

TL;DR

This paper investigates fluctuations in maximum pseudo-rapidity gaps in high-energy nucleus-nucleus collisions, revealing significant fluctuations that decrease with increasing multiplicity, and compares experimental data with simulations from MC-RAND and UrQMD models.

Contribution

It provides the first event-by-event analysis of maximum pseudo-rapidity gap fluctuations in relativistic heavy-ion collisions using nuclear emulsion data.

Findings

Scaled variance indicates strong fluctuation presence.

Fluctuations decrease with higher average multiplicity.

UrQMD underestimates fluctuations compared to experimental data.

Abstract

A study of Event by Event analysis of maximum Pseudo-rapidity Gap Fluctuation in heavy-ion collisions in terms of the scaled variance {\omega} has been carried out for relativistic AA collisions with multiplicity cut (N >10) using nuclear emulsion data at 4.5 AGeV/c. The values of scaled variance are found to be greater than zero indicating the presence of strong fluctuation of maximum rap gap values in the multiparticle production process. The event by event fluctuations are found to decrease with the increase of average multiplicity of the interactions. Experimental analysis has been compared with the results obtained from the analysis of events simulated by generating random numbers (MC-RAND events) and also by Ultra Relativistic Quantum Molecular Dynamics (UrQMD) model. UrQMD model simulated values of event by event fluctuations of maximum rapidity gap are less than the corresponding experimental values.