Femtoscopy scales and particle production in the relativistic heavy ion collisions from Au+Au at 200 AGeV to Xe+Xe at 5.44 ATeV within the integrated hydrokinetic model

TL;DR

This paper reviews femtoscopy scales and particle production in high-energy heavy-ion collisions using the integrated hydrokinetic model across various nuclei and energies, analyzing effects of initial conditions and model parameters.

Contribution

It provides a comprehensive re-examination of soft observables and femtoscopy radii in heavy-ion collisions at different energies within the iHKM framework, including the role of initial conditions and the EoS.

Findings

Femtoscopy radii depend on initial transverse size.

Model parameters significantly influence particle yields.

Possible insights into the photon puzzle are discussed.

Abstract

The recent results on the main soft observables, including hadron and photon yields and particle number ratios, $p_T$ spectra, flow harmonics, as well as the femtoscopy radii, obtained within the integrated hydrokinetic model (iHKM) for high-energy heavy-ion collisions are reviewed and re-examined. The cases of different nuclei colliding at different energies are considered: Au+Au collisions at the top RHIC energy $\sqrt{s_{NN}}=200$ GeV, Pb+Pb collisions at the LHC energies $\sqrt{s_{NN}}=2.76$ TeV and $\sqrt{s_{NN}}=5.02$ TeV, and the LHC Xe+Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV. The effect of the initial conditions and the model parameters, including the utilized equation of state (EoS) for quark-gluon phase, on the simulation results, as well as the role of the final afterburner stage of the matter evolution are discussed. The possible solution of the so-called ``photon puzzle'' is considered. The attention is also paid to the dependency of the interferometry volume and individual interferometry radii on the initial transverse geometrical size of the system formed in the collision.