Resonance production in partial chemical equilibrium

TL;DR

This paper uses a hadron resonance gas model with partial chemical equilibrium to analyze resonance ratios in high-energy collisions, providing insights into the medium's evolution between chemical and kinetic freeze-out.

Contribution

It introduces a novel application of the partial chemical equilibrium model to interpret resonance ratios measured at RHIC and LHC energies.

Findings

Model calculations agree with experimental data on resonance ratios.

Resonance ratios help distinguish between different freeze-out scenarios.

The approach enhances understanding of the medium's properties during expansion.

Abstract

In high energy collisions, a dense, strongly interacting medium could be created, the quark gluon plasma. In rapid expansion, from the soup of quarks and gluons a gas of resonance and stable particles is formed at the chemical freeze-out and after that, as the system cools down, the kinetic freeze-out takes place and interaction between particles ceases. By measuring resonance ratios one could get information about the dominant physical processes in the intermediate temperature ranges, i.e. between the chemical and kinetic freeze-out. These quantities are measured at RHIC and LHC energies. In the present analysis we employ the hadron resonance gas model assuming partial chemical equilibrium to characterize these measured data. We calculate the ratios of several resonances to their stable counterpart and compare these model calculations to available experimental data.