Ideal Hydrodynamics for Bulk and Multistrange Hadrons in $\sqrt{s_{NN}}$=200\,AGeV Au-Au Collisions

TL;DR

This paper enhances ideal hydrodynamics modeling of heavy-ion collisions by incorporating recent lattice-QCD equations of state, refined initial conditions, and sequential decoupling, successfully describing various hadron observables at RHIC.

Contribution

It introduces an improved hydrodynamic framework with updated physics inputs and decoupling schemes, providing a more accurate description of bulk and multistrange hadron data.

Findings

Consistent description of hadron chemistry, spectra, and flow.

Effective modeling of multistrange hadron decoupling.

Alignment with experimental observations at RHIC.

Abstract

We revisit the use of ideal hydrodynamics to describe bulk- and multistrange-hadron observables in nuclear collisions at the Relativistic Heavy Ion Collider. Toward this end we augment the 2+1-dimensional code "AZHYDRO" by employing (a) an equation of state based on recent lattice-QCD computations matched to a hadron-resonance gas with chemical decoupling at $T_{\rm ch}\simeq$160\,MeV, (b) a compact initial density profile, (c) an initial-flow field including azimuthal anisotropies, and (d) a sequential kinetic decoupling of bulk ($\pi$, $K$, $p$) and multistrange ($\phi$, $\Xi$, $\Omega$) hadrons at $T\simeq110$\,MeV and 160\,MeV, respectively. We find that this scheme allows for a consistent description of the observed chemistry, transverse-momentum spectra and elliptic flow of light and strange hadrons.