Systematics of chemical freeze-out parameters in heavy-ion collision experiments

TL;DR

This paper analyzes the systematic uncertainties in determining chemical freeze-out parameters in heavy-ion collisions, showing that these uncertainties are generally within experimental errors and exploring effects of different constraints.

Contribution

It provides a systematic study of uncertainties in freeze-out parameters and examines the impact of different constraints on these parameters in heavy-ion collision experiments.

Findings

Systematic uncertainties are within experimental errors.

Unconstrained charge ratios align with expected values up to 40 GeV.

Uncertainties increase at higher energies, indicating reduced baryon stopping.

Abstract

We discuss systematic uncertainties in the chemical freeze-out parameters from the $\chi^2$ analysis of hadron multiplicity ratios in the heavy-ion collision experiments. The systematics due to the choice of specific hadron ratios are found to lie within the experimental uncertainties. The variations obtained by removing the usual constraints on the conserved charges show similar behavior. The net charge to net baryon ratios in such unconstrained systems are commensurate with the expected value obtained from the protons and neutrons of the colliding nuclei up to the center of mass energies $\sim 40$ GeV. Beyond that the uncertainties in this ratio gradually increases, possibly indicating the reduction in baryon stopping.