Next-generation multi-fluid hydrodynamic model for RHIC BES

TL;DR

This paper introduces a novel three-fluid hydrodynamic model for simulating heavy-ion collisions at intermediate energies, enhancing sensitivity to the QCD Equation of State and capturing complex initial dynamics.

Contribution

The paper presents a new hybrid three-fluid hydrodynamic model that improves upon previous models by better representing initial interpenetration and sensitivity to the Equation of State.

Findings

Model successfully reproduces hadron spectra in rapidity and transverse momentum.

Elliptic flow calculations align with experimental data.

Enhanced sensitivity to the QCD critical endpoint region.

Abstract

We have developed a next-generation hybrid event-by-event three-fluid hydrodynamic model, suitable for simulations of heavy-ion collisions in the energy range from few up to tens of GeV per colliding NN pair. At such energies the interpenetration time of the nuclei is of the same order as the lifetime of the system, however this model treats the initial phase hydrodynamically. Thanks to that it is more sensitive to the Equation of State than 1-fluid models with initial states being parametrised or generated by transport approach. Hence, our model is well designed for simulations at collision energies, at which matter in vicinity of the QCD critical endpoint is expected. The construction of the model is explained and basic observables like hadron spectra in rapidity and transverse momentum, as well as elliptic flow are calculated.