Hydrokinetic predictions for femtoscopy scales in A+A collisions in the light of recent ALICE LHC results

TL;DR

This paper investigates how pion spectra and interferometry scales evolve with energy in heavy-ion collisions across SPS, RHIC, and LHC energies using hydrokinetic modeling, explaining paradoxical scale behaviors and comparing predictions with ALICE data.

Contribution

It introduces a hydrokinetic approach to predict femtoscopy scales at LHC energies and explains the energy dependence of interferometry radii.

Findings

Hydrokinetic model explains the decrease of $R_{out}/R_{side}$ ratio with energy.

Predicted HBT radii at LHC are consistent with ALICE measurements.

Identifies mechanisms behind the paradoxical energy dependence of femtoscopy scales.

Abstract

A study of energy behavior of the pion spectra and interferometry scales is carried out for the top SPS, RHIC and for LHC energies within the hydrokinetic approach. The main mechanisms that lead to the paradoxical, at first sight, dependence of the interferometry scales with an energy growth, in particular, a decrease $R_{out}/R_{side}$ ratio, are exposed. The hydrokinetic predictions for the HBT radii at LHC energies are compared with the recent results of the ALICE experiment.