Overlap between Lattice QCD and HRG with in-medium effects and parity doubling

Abstract

We investigate the fluctuations and correlations involving baryon number in hot hadronic matter with modified masses of negative-parity baryons, in the context of the hadron resonance gas. Temperature-dependent masses are adopted from the recent lattice QCD results and from a chiral effective model which implements the parity doubling structure with respect to the chiral symmetry. Confronting the baryon number susceptibility, baryon-charge correlation, and baryon-strangeness correlation and their ratios with the lattice QCD data, we show that the strong downward mass shift in hyperons can accidentally reproduce some correlation ratios, however it also tends to overshoot the individual fluctuations and correlations. This indicates, that in order to correctly account for the influence of the chiral symmetry restoration on the fluctuation observables, a consistent framework of in-medium effects beyond hadron mass shifts is required.

9 pages, 5 figures. To appear in Proceedings of Strangeness in Quark Matter 2017

References in corpus (8)

• The QCD equation of state with dynamical quarks
• Probing freeze-out conditions in heavy ion collisions with moments of charge fluctuations
• Freeze-out conditions from net-proton and net-charge fluctuations at RHIC
• Additional Strange Hadrons from QCD Thermodynamics and Strangeness Freeze-out in Heavy Ion Collisions
• Light baryons below and above the deconfinement transition: medium effects and parity doubling
• Skewness and kurtosis of net baryon-number distributions at small values of the baryon chemical potential
• Repulsive interactions and their effects on the thermodynamics of hadron gas
• Conserved charge fluctuations at vanishing and non-vanishing chemical potential