Core-corona separation in the UrQMD hybrid model

TL;DR

This paper uses the UrQMD hybrid model to study how separating the hot core from the dilute corona in high-energy heavy ion collisions affects particle production and flow, improving agreement with experimental data.

Contribution

It introduces a core-corona separation approach within the UrQMD hybrid model to better describe strange particle production and flow across energies.

Findings

Core fraction varies significantly with energy.

Core-corona separation improves strange particle ratio predictions.

Enhanced modeling of particle yields and flow with separation.

Abstract

We employ the UrQMD transport + hydrodynamics hybrid model to estimate the effects of a separation of the hot equilibrated core and the dilute corona created in high energy heavy ion collisions. It is shown that the fraction of the system which can be regarded as an equilibrated fireball changes over a wide range of energies. This has an impact especially on strange particle abundancies. We show that such a core corona separation allows to improve the description of strange particle ratios and flow as a function of beam energy as well as strange particle yields as a function of centrality.