2025/09/05 by Mahbobeh Jafarpour, Jafarpour, Mahbobeh, K. Werner +6
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Ion-surface interactions and analysis #Laser-induced spectroscopy and plasma #Nuclear Theory (nucl-th) #X-ray Spectroscopy and Fluorescence Analysis
paper · doi:10.48550/arxiv.2509.05428
openalex publication_date 2025/09/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this study we examine the impact of the initial stage and dynamical evolution on final-state observables in heavy-ion collisions. For this goal we develop a novel approach, EPOSir+PHSDe, which employs EPOS initial conditions as the starting point for parton and hadron evolution within the PHSD microscopic transport approach. By examining the space-time evolution of matter in this model and comparing to EPOS (which starts with an S-matrix approach for parallel scatterings for the initial conditions and uses a hydrodynamic evolution for the quark-gluon plasma stage with the UrQMD as afterburner) and PHSD (which starts with primary high energy NN scattering realized via the LUND string model and continues with fully microscopic transport dynamics for strongly interacting partonic and hadronic matter), we identify the key differences in the final particle distributions among the three approaches. Our analysis focuses on rapidity, transverse momentum spectra, and flow harmonics v2 for Au+Au collisions at the invariant energy of √sNN=200 GeV. We find a dominant influence of dynamical evolution over the initial conditions on the final observables.