Investigating the pion source function in heavy-ion collisions with the EPOS model

Abstract

By measuring the momentum correlations of pions created in heavy-ion collisions we can gain information about the space-time geometry of the particle emitting source. Recent experimental results from multiple different collaborations demonstrated that to properly describe the shape of the measured correlation functions, one needs to go beyond the Gaussian approximation. Some studies suggest that the Levy distribution could provide a good description of the source. While there are already many experimental results, there is very little input from the phenomenology side in explanation of the observed non-Gaussian source shapes. The EPOS model is a sophisticated hybrid model where the evolution of the newly-created system is governed by Parton-Based Gribov-Regge theory. It has already proved to be successful in describing many different experimental observations for the systems characterized by baryon chemical potential close to zero, but so far the source shape has not been explored in detail. In this paper we discuss studies of the pion emitting source based on the theoretical approach of the EPOS model.

arXiv comment7 pages, 5 figures, Summer XLVI-th IEEE-SPIE Joint Symposium Wilga 2020 - conference proceedings

References in corpus (17)

• Microscopic Models for Ultrarelativistic Heavy Ion Collisions
• Relativistic Hadron-Hadron Collisions in the Ultra-Relativistic Quantum Molecular Dynamics Model (UrQMD)
• Femtoscopy in Relativistic Heavy Ion Collisions: Two Decades of Progress
• The QCD thermal phase transition in the presence of a small chemical potential
• Parton-Based Gribov-Regge Theory
• Core-Corona Separation in Ultra-Relativistic Heavy Ion Collisions
• Imaging of Sources in Heavy-Ion Reactions
• The Space-Time Structure of Hadronization in the Lund Model
• Lévy-stable two-pion Bose-Einstein correlations in $\sqrt{s_{{}_{NN}}}=200$ GeV Au$+$Au collisions
• Evidence for a long-range component in the pion emission source in Au+Au collisions at sqrt(s_NN) = 200 GeV
• Quantum Statistical Correlations for Slowly Expanding Systems
• Anomalous diffusion of pions at RHIC
• Bose-Einstein or HBT correlations and the anomalous dimension of QCD
• Centrality dependent Lévy-stable two-pion Bose-Einstein correlations at the PHENIX experiment
• The Shape of the Correlation Function
• Shape analysis of HBT correlations at STAR
• Levy HBT results at NA61/SHINE

Cited by in corpus (2)

• Azimuthal dependence of two-particle transverse momentum current correlations
• Investigating the pion emission source in pp collisions using the AMPT model with sub-nucleon structure