Description of the particle ratios and transverse-momentum spectra for various centralities at RHIC in a single-freeze-out model

TL;DR

This paper applies a single-freeze-out model to describe particle ratios and transverse-momentum spectra at RHIC, achieving good agreement with new high-energy measurements and revealing a scaling relation with collision centrality.

Contribution

The study demonstrates that a single-freeze-out model can accurately describe RHIC data across different centralities, with a simple scaling of parameters linked to wounded nucleons.

Findings

Model fits well with experimental data

Expansion parameters scale with centrality

Scaling relates to wounded nucleon number

Abstract

The single-freeze-out model of hadron production is used to describe the particle ratios and the transverse-momentum spectra from RHIC. The emphasis is put on the new measurements done at the highest beam energy of 200 GeV. An overall very good agreement is found between the data and the model predictions. The data for different centrality windows are analyzed separately. A simple scaling of the two expansion parameters of the model with the centrality is found. Interestingly, this scaling turns out to be equivalent to the scaling of hadron production with the number of wounded nucleons.