Determination of Chemical Freeze-out Parameters from Net-kaon Fluctuations at RHIC

TL;DR

This study uses the HRG model to analyze net-kaon fluctuations at RHIC energies, comparing different particle data lists to determine how resonance inclusion affects chemical freeze-out parameters.

Contribution

It provides a comparative analysis of how different resonance data lists influence the extraction of freeze-out parameters from net-kaon fluctuation data.

Findings

Resonance list choice significantly impacts freeze-out parameter estimates.

The HRG model effectively describes net-kaon fluctuation ratios at high energies.

Differences between PDG2012 and PDG2016+ lists alter the inferred freeze-out conditions.

Abstract

We calculate the mean-over-variance ratio of the net-kaon fluctuations in the Hadron Resonance Gas (HRG) Model for the five highest energies of the RHIC Beam Energy Scan (BES) for different particle data lists. We compare these results with the latest experimental data from the STAR collaboration in order to extract sets of chemical freeze-out parameters for each list. We focused on the PDG2012 and PDG2016+ particle lists, which differ largely in the number of resonant states. Our analysis determines the effect of the amount of resonances included in the HRG on the freeze-out conditions.