Effect of anisotropy on HBT radii using leptonpair interferometry

TL;DR

This paper investigates how initial momentum-space anisotropy affects the HBT radii derived from leptonpair interferometry in high-energy collisions, revealing significant changes in the system's spatial and temporal dimensions.

Contribution

It introduces a comparative analysis of anisotropic and isotropic QGP evolution models to study their impact on HBT radii in leptonpair interferometry.

Findings

Anisotropy significantly alters the spatial and temporal dimensions of the evolving system.

The study demonstrates measurable differences in HBT radii due to initial state anisotropy.

Results suggest anisotropy must be considered for accurate interpretation of interferometry data.

Abstract

The effect of initial state momentum-space anisotropy on invariant mass dependence of HBT radii extracted from the leptonpair interferometry is presented here. We have studied the Bose-Einstein Correlation Function (BECF) for two identical virtual photons decaying to leptonpairs at most central collision of LHC energy having fixed transverse momentum of one of the virtual photons ($k_{1T}$= 2 GeV). The {\em free streaming interpolating} model with fixed initial condition has been used for the evolution in anisotropic Quark Gluon Plasma (aQGP) and the relativistic (1+2)d hydrodynamics model with cylindrical symmetry and longitudinal boost invariance has been used for both isotropic Quark Gluon Plasma (iQGP) and hadronic phases. We found a significant change in the spatial and temporal dimension of the evolving system in presence of initial state momentum-space anisotropy.