Studying the effect of the hadronic phase in nuclear collisions with PYTHIA and UrQMD

TL;DR

This paper investigates how the hadronic phase influences key observables in heavy-ion collisions by coupling PYTHIA-generated Pb-Pb events with UrQMD simulations, focusing on charged particles, momentum spectra, and resonance ratios.

Contribution

It introduces a novel coupling of PYTHIA and UrQMD to study the hadronic phase effects on collision observables, emphasizing short-lived resonances.

Findings

Hadronic phase significantly affects resonance yields.

Coupled simulation provides better agreement with experimental data.

Short-lived resonances are particularly sensitive to the hadronic phase.

Abstract

In this work, we couple Pb-Pb events simulated with the PYTHIA Angantyr event generator at $\sqrt{s_{\rm{NN}}}=2.76$ and $5.02$~TeV with the hadronic cascade simulator UrQMD to study the effect of the hadronic phase on observables such as charged-particle multiplicity densities, transverse momentum spectra and identified particle ratios, giving special emphasis to short-lived resonances.