Sensitivity of multiplicity fluctuations to freeze-out conditions in heavy ion collisions

TL;DR

This paper investigates how higher-order multiplicity fluctuations in heavy ion collisions can provide additional insights into the chemical freeze-out conditions of the quark-gluon plasma, complementing traditional yield ratio analyses.

Contribution

It demonstrates that fluctuation measurements of specific hadrons offer significant new information on freeze-out parameters beyond yield ratios in heavy ion collisions.

Findings

Fluctuation measurements enhance the determination of freeze-out conditions.

Certain hadron fluctuations are more sensitive to freeze-out parameters.

Fluctuation data can complement yield ratio analyses.

Abstract

We study the sensitivity of the higher-order moments of produced particle multiplicity distributions to the chemical freeze-out parameters in relativistic heavy ion collisions using the Hadron Resonance Gas (HRG) model. We compare the obtained sensitivity level to the one extracted from the ratios of particle yields. We find that, for certain final state hadrons, the fluctuation measurements add significant information to the determination of the hadro-chemical freeze-out properties of the deconfined phase of matter obtained at RHIC and the LHC.