Van der Waals Interactions and Hadron Resonance Gas: Role of resonance widths modeling on conserved charges fluctuations

Volodymyr Vovchenko,Mark I Gorenstein,Horst Stoecker,Paolo Alba

doi:10.1051/epjconf/201817114006

Abstract

The quantum van der Waals (QvdW) extension of the ideal hadron resonance gas (HRG) model which includes the attractive and repulsive interactions between baryons – the QvdW-HRG model – is applied to study the behavior of the baryon number related susceptibilities in the crossover temperature region. Inclusion of the QvdW interactions leads to a qualitatively different behavior of susceptibilities, in many cases resembling lattice QCD simulations. It is shown that for some observables, in particular for χBQ11/χB2, effects of the QvdW interactions essentially cancel out. It is found that the inclusion of the finite resonance widths leads to an improved description of χB2, but it also leads to a worse description of χBQ11/χB2, as compared to the lattice data. On the other hand, inclusion of the extra, unconfirmed baryons into the hadron list leads to a simultaneous improvement in the description of both observables.

Highlights

Lattice QCD simulations provide the equation of state of strongly interacting matter at zero net baryon density [1, 2]
It is found that the inclusion leads to a of the worse finite resonance widths description of χ1B1Q/χ2B, leads to an improved description of χ2B, but it as compared to the lattice data
Inclusion of the extra, unconfirmed baryons into the hadron list leads to a simultaneous improvement in the description of both observables

Summary

Introduction

Lattice QCD simulations provide the equation of state of strongly interacting matter at zero net baryon density [1, 2]. It is found that the inclusion leads to a of the worse finite resonance widths description of χ1B1Q/χ2B, leads to an improved description of χ2B, but it as compared to the lattice data.

Results

Conclusion