Event-by-event investigation of the kaon pair-source function with EPOS

TL;DR

This paper uses the EPOS event generator to analyze the kaon pair-source function in high-energy Au+Au collisions, revealing insights into the source shape and distribution beyond Gaussian assumptions.

Contribution

It provides the first event-by-event investigation of the kaon source function using EPOS, highlighting the potential of Monte Carlo models for source analysis in heavy-ion collisions.

Findings

Source function exhibits non-Gaussian features.

Lévy-stable distributions better describe the data.

Event-by-event analysis offers detailed source insights.

Abstract

In high-energy collisions, we can obtain information about the source function by measuring the two-particle Bose-Einstein correlation function and considering its relationship with the phase-space density of the particle-emitting source. While a Gaussian shape is commonly assumed, measurements and anomalous diffusion suggest L\'evy-stable distributions, as observed in the PHENIX experiment for kaon-kaon pair-source functions. Event generators like EPOS allow direct investigation of freeze-out coordinates, facilitating the analysis of the source function. EPOS, a Monte Carlo-based model, simulates high-energy nuclear and particle collisions, integrating Parton-Based Gribov-Regge theory for initial evolution, subsequent hydrodynamic evolution, and hadronization. In this paper, we present an event-by-event analysis of the kaon source function in $\sqrt{s_\text{NN}}$ = 200 GeV Au+Au collisions using the EPOS model.