Simulating collectivity in dense baryon matter with multiple fluids

TL;DR

This paper introduces MUFFIN, a multi-fluid simulation model for heavy-ion collisions at FAIR/BES energies, successfully reproducing experimental data and revealing polarization effects driven by baryon chemical potential.

Contribution

The paper presents a novel multi-fluid approach (MUFFIN) for simulating dense baryon matter in heavy-ion collisions, capturing polarization phenomena related to baryon chemical potential.

Findings

Reproduces basic experimental observables in Au-Au collisions.

Shows polarization splitting between $\Lambda$ and anti-$\Lambda$ hyperons.

Splitting driven by finite baryon chemical potential.

Abstract

We report on construction of a modern multi-fluid approach to heavy-ion collisions at FAIR/BES energies (MUFFIN) and show the reproduction of basic experimental observables in Au-Au collisions in the RHIC Beam Energy Scan program. We also show the $p_T$-differential and $p_T$-integrated polarization of (anti-)$\Lambda$ hyperons. In MUFFIN simulations, we observe a strong splitting between polarizations of $\Lambda$ and anti-$\Lambda$. The splitting is driven purely by a finite baryon chemical potential.