A Hydrodynamic and Transport Model for Ultrarelativistic Heavy Ion Collisions at RHIC and LHC Energies

TL;DR

This paper introduces a hybrid hydrodynamic-transport model for simulating ultrarelativistic heavy ion collisions at RHIC and LHC energies, successfully reproducing key experimental observables and analyzing the impact of model parameters.

Contribution

The paper presents a novel Hydro-PACIAE hybrid model combining hydrodynamics and transport simulations for heavy ion collisions at high energies.

Findings

Reproduces experimental pseudorapidity and transverse momentum distributions.

Predicts elliptic flow $v_2$ values larger than experimental data at high $p_T$.

Shows transition hypersurface selection significantly affects observables.

Abstract

Combining the hydrodynamic model (Hydro code) and the transport model (PACIAE model), we present the Hydro-PACIAE hybrid model. We use the Hydro-PACIAE hybrid model to calculate Au+Au collisions at $\sqrt{s_{NN}}$=130 GeV and Pb+Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV. The obtained pseudo-rapidity and transverse momentum distributions well reproduce the experimental data. This shows that the Hydro-PACIAE hybrid model is useful to describe the ultrarelativistic Heavy Ion Collisions at RHIC and LHC Energies. We used the hybrid model to calculate the elliptical flow for the Pb+Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV. The $v_2$ values are bigger than the experimental data at high $p_T$, and will become bigger when the Hydro evolution time is longer. The results indicate that the selection of the transition hypersurface has significant effect on the observable quantities.