Femtoscopy in Relativistic Heavy Ion Collisions and its Relation to Bulk Properties of QCD Matter

TL;DR

This paper investigates how various model features in viscous hydrodynamics affect femtoscopic measurements in relativistic heavy ion collisions, demonstrating that with proper adjustments, experimental source sizes can be accurately explained.

Contribution

It systematically explores the impact of model parameters on femtoscopic observables and shows how to reconcile model predictions with experimental data.

Findings

Femtoscopy is influenced by model features at the 10% level.

Adjusting model parameters can explain experimental source sizes within 10%.

The study highlights the importance of the equation of state and viscous parameters.

Abstract

Using a viscous hydrodynamic model coupled to a hadronic cascade code, numerous features of the dynamics and equilibrium properties are explored for their impact on femtoscopic measurements. The equation of state, viscous parameters and initial conditions are investigated. We find that femtoscopy is affected by numerous model features at the 10% level, and that by including features and adjusting unknown parameters, one can explain experimental source size measurements to better than 10%.