Identified Particle Spectra for Au+Au Collisions at $\sqrt{s}$ = 200 GeV from STAR, PHENIX and BRAHMS in Comparison to Core-Corona Model Predictions

TL;DR

This paper evaluates the core-corona model's ability to describe the centrality dependence of identified particle spectra in Au+Au collisions at 200 GeV, using data from STAR, PHENIX, and BRAHMS, highlighting experimental discrepancies.

Contribution

The study extends the core-corona model analysis to single particle spectra of identified particles, comparing predictions with experimental data from multiple collaborations.

Findings

The core-corona model describes the data well within experimental uncertainties.

Differences in experimental data affect the model parameters.

The model's applicability varies with experimental datasets.

Abstract

The core-corona model describes quite successfully the centrality dependence of multiplicity and $<p_t>$ of identified particles observed in heavy ion reaction at beam energies between $\sqrt{s}$ = 17 GeV and 200 GeV. Also the centrality dependence of the elliptic flow, $v_2$, for all charged and identified particles could be explained in this model. Here we extend this analysis and study the centrality dependence of single particle spectra of identified particles. We concentrate here on protons, antiprotons, kaons and pions which have all been measured by the PHENIX, STAR and BRAHMS collaborations. We find that an analysis of the spectra in the core-corona model suffers from differences in the data published by the different experimental groups, notably for the pp collisions. For each experience the data agree well with the prediction of the core-corona model but the value of the two necessary parameters depends onthe experiments.