Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 30: Heavy Ion Collisions and QCD Phases VII
HK 30.3: Vortrag
Mittwoch, 29. März 2017, 17:30–17:45, F 3
Influence of Van der Waals interactions between hadrons on observables from heavy-ion collisions and lattice QCD — •Volodymyr Vovchenko1,2, Paolo Alba1, Mark Gorenstein1,3, and Horst Stoecker1,2,4 — 1FIAS, Frankfurt, Germany — 2ITP, Uni-Frankfurt, Frankfurt, Germany — 3Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine — 4GSI, Darmstadt, Germany
Extension of the ideal hadron resonance gas (HRG) model is constructed which includes attractive and repulsive van der Waals (VDW) interactions between hadrons. The VDW parameters a and b are fixed by the ground state properties of nuclear matter, and this VDW-HRG model yields the nuclear liquid-gas transition at low temperatures and high baryonic densities.
The predictions of the model are confronted with the lattice QCD calculations at zero chemical potential. The inclusion of VDW interactions between baryons leads to a qualitatively different behavior of cumulants of fluctuations of conserved charges, for many observables closely resembling the lattice QCD results. Calculations also suggest that strange baryons have weaker VDW interactions compared to non-strange ones. We also explore the effect of VDW interactions on the thermal fits to heavy-ion hadron yield data and find that existing agreement of ideal HRG is not spoiled in the VDW-HRG model. Finally, we find that VDW interactions have a rather substantial influence on the higher orders of fluctuations of conserved charges at finite chemical potential, in the regions where chemical freeze-out in heavy-ion collisions is expected to occur.