Conserved number fluctuations in a hadron resonance gas model

TL;DR

This paper investigates conserved number fluctuations in a hadron resonance gas model to understand freeze-out conditions and phase structure in high energy heavy-ion collisions, emphasizing experimental acceptance effects.

Contribution

It provides a detailed analysis of how experimental acceptances influence conserved number fluctuations within the HRG model, aiding more accurate comparisons with experimental data.

Findings

Net-baryon fluctuations are less affected by acceptance effects.

Net-charge and net-strangeness fluctuations are significantly influenced by experimental conditions.

The study helps refine the interpretation of fluctuation measurements in heavy-ion collision experiments.

Abstract

Net-baryon, net-charge and net-strangeness number fluctuations in high energy heavy-ion collisions are discussed within the framework of a hadron resonance gas (HRG) model. Ratios of the conserved number susceptibilities calculated in HRG are being compared to the corresponding experimental measurements to extract information about the freeze-out condition and the phase structure of systems with strong interactions. We emphasize the importance of considering the actual experimental acceptances in terms of kinematics (pseudorapidity ($\eta$) and transverse momentum ($p_{T}$)), the detected charge state, effect of collective motion of particles in the system and the resonance decay contributions before comparisons are made to the theoretical calculations. In this work, based on HRG model, we report that the net-baryon number fluctuations are least affected by experimental acceptances compared to the net-charge and net-strangeness number fluctuations.