Hadronic correlations above the chiral/deconfinement transition

TL;DR

This paper revises the statistical bootstrap model to include medium-dependent resonance widths, successfully describing lattice QCD data above the transition and explaining experimental particle ratios without heavy resonances.

Contribution

It introduces a medium-dependent resonance width into the bootstrap model, resolving divergence issues and aligning with lattice QCD results above the transition.

Findings

Model with zero width below T_H and Hagedorn-like width above T_H matches lattice QCD data

Explains absence of heavy resonance contributions in experimental particle ratios

Eliminates divergence of thermodynamic functions above T_H

Abstract

The statistical bootstrap model is critically revised in order to include a medium-dependent resonance width in it. We show that a thermodynamic model with a vanishing width below the Hagedorn temperature T_H and a Hagedorn spectrum-like width above T_H may not only eliminate the divergence of the thermodynamic functions above T_H, but also gives a satisfactory description the lattice quantum chromodynamics (QCD) data on the energy density above the chiral/deconfinement transition as the main result of this contribution. This model allows to explain the absence of heavy resonance contributions in the fit of the experimentally measured particle ratios at SPS and RHIC energies.