Evolution of pion HBT radii from RHIC to LHC -- Predictions from ideal hydrodynamics

TL;DR

This paper uses ideal hydrodynamics to predict how pion HBT radii evolve from RHIC to LHC energies, showing increased radii and shape deformation changes with initial conditions.

Contribution

It provides hydrodynamic predictions for pion HBT radii at LHC energies across different initial conditions, including shape oscillations and deformation trends.

Findings

HBT radii increase with initial entropy density.

Azimuthal oscillation amplitudes reflect shape deformation changes.

Predicted transition from out-of-plane to in-plane source deformation.

Abstract

We present hydrodynamic predictions for the charged pion HBT radii for a range of initial conditions covering those presumably reached in Pb+Pb collisions at the LHC. We study central (b=0) and semi-central (b=7fm) collisions and show the expected increase of the HBT radii and their azimuthal oscillations. The predicted trends in the oscillation amplitudes reflect a change of the final source shape from out-of-plane to in-plane deformation as the initial entropy density is increased.