Global observables and secondary interactions in central Au+Au reactions at $\sqrt{s}=200$ AGeV

TL;DR

This paper uses the UrQMD model to analyze global observables in central Au+Au collisions at RHIC energies, highlighting the role of secondary interactions and rescattering in particle production and flow.

Contribution

It demonstrates the importance of secondary interactions and rescattering effects in shaping particle flow and global observables in high-energy heavy-ion collisions.

Findings

Secondary interactions increase particle production and stopping.

Rescattering induces additional flow of baryons and kaons.

Pions are cooled down by meson rescattering.

Abstract

The Ultra-relativistic Quantum Molecular Dynamics model (UrQMD) is used to study global observables in central reactions of Au+Au at $\sqrt{s}=200$ AGeV (RHIC). Strong stopping governed by massive particle production is predicted if secondary interactions are taken into account. The underlying string dynamics and the early hadronic decoupling implies only small transverse expansion rates. However, rescattering with mesons is found to act as a source of pressure leading to additional flow of baryons and kaons, while cooling down pions.