Features of two-pion Bose-Einstein correlations based on event-by-event analysis in smoothed particle hydrodynamics

TL;DR

This paper investigates how event-by-event fluctuations in initial conditions affect two-pion Bose-Einstein correlations in high-energy heavy ion collisions, revealing significant fluctuations and a potential signal for system inhomogeneity.

Contribution

It introduces an analysis of event-by-event fluctuations in two-pion correlations using smoothed particle hydrodynamics, highlighting their importance for understanding source inhomogeneity.

Findings

Significant event-by-event fluctuations in two-pion correlation functions.

Wide distributions of fluctuations indicate source inhomogeneity.

Root-mean-square of fluctuations can detect system inhomogeneity.

Abstract

We examine the space-time structure of the particle-emitting sources with fluctuating initial conditions in smoothed particle hydrodynamics. The two-pion correlation functions of single events for the sources exhibit event-by-event fluctuations. The large event-by-event fluctuations and wide distributions of the error-inverse-weighted fluctuations between the HBT correlation functions of single and mixed events are important features for the sources with the fluctuating initial conditions. The root-mean-square of the weighted fluctuations is a signal to detect the inhomogeneity of the systems produced in high energy heavy ion collisions.