Elliptic Flow Suppression due to Hadron Mass Spectrum

TL;DR

This paper explores how an exponentially increasing hadron mass spectrum influences the azimuthal anisotropy in heavy ion collisions, showing that Hagedorn resonances can suppress elliptic flow near the transition temperature.

Contribution

It demonstrates the impact of the Hagedorn spectrum on elliptic flow suppression in ultrarelativistic heavy ion collisions.

Findings

Hagedorn resonances suppress elliptic flow near the transition temperature

Hadron mass spectrum influences azimuthal anisotropy

Resonance production affects flow observables

Abstract

Hadron resonance gas models provide a good description of the equation of state of quantum chromodynamics determined by lattice QCD calculations at temperatures $T \sim 100-155$ MeV. In this paper we investigate the effects of an exponentially increasing hadron mass spectrum (Hagedorn spectrum) on the azimuthal anisotropy of the rapidly expanding matter formed in ultrarelativistic heavy ion collisions. If the temperature at which the conversion from fluid degrees of freedom to hadrons is sufficiently close to the Hagedorn temperature, the production of Hagedorn resonances suppresses the differential elliptic flow of all hadron species.