Test of Chemical freeze-out at RHIC

TL;DR

This paper systematically tests the chemical freeze-out hypothesis at RHIC by applying thermal model fits to various particle ratios across different collision systems and rapidity regions, examining system size and rapidity dependence.

Contribution

It introduces a consistent methodology for thermal model fits across multiple systems and explores rapidity dependence of freeze-out parameters at RHIC.

Findings

Thermal model fits are consistent across different system sizes.

Rapidity dependence of thermal parameters is observed.

System size influences chemical freeze-out conditions.

Abstract

We present the results of a systematic test applying statistical thermal model fits in a consistent way for different particle ratios, and different system sizes using the various particle yields measured in the STAR experiment. Comparison between central and peripheral Au+Au and Cu+Cu collisions with data from p+p collisions provides an interesting tool to verify the dependence with the system size. We also present a study of the rapidity dependence of the thermal fit parameters using available data from RHIC in the forward rapidity regions and also using different parameterization for the rapidity distribution of different particles.