Uniform description of bulk observables in the hydrokinetic model of A+A collisions at RHIC and LHC

TL;DR

This paper presents a comprehensive hydrokinetic model that accurately describes bulk observables in A+A collisions at RHIC and LHC energies, emphasizing the model's consistency across different energies and centralities.

Contribution

The study introduces a unified hydrokinetic model with minimal parameter adjustments to describe A+A collision data at both RHIC and LHC energies, including a hybrid approach for hadron evolution.

Findings

Model successfully reproduces hadronic yields and spectra.

Consistent description across RHIC and LHC energies.

Analysis of particle ratio modifications due to annihilations.

Abstract

A simultaneous description of hadronic yields; pion, kaon, and proton spectra; elliptic flows; and femtoscopy scales in the hydrokinetic model of A+A collisions is presented at different centralities for the top BNL Relativistic Heavy Ion Collider (RHIC) and CERN Large Hadron Collider (LHC) 2.76-TeV energies. The initial conditions are based on the Glauber Monte-Carlo simulations. When going from RHIC to LHC energy in the model, the only parameters changed are the normalization of the initial entropy defined by the number of all charged particles in most central collisions, contribution to entropy from binary collisions and baryonic chemical potential. The hydrokinetic model is used in its hybrid version (hHKM), which provides the correct match (at the isochronic hypersurface) of the decaying hadron matter evolution with hadronic ultrarelativistic quantum molecular dynamics cascade. The results are compared with the standard hybrid models where hydrodynamics and hadronic cascade are matching just at the non-space-like hypersurface of chemical freeze-out or on the isochronic hypersurface. The modification of the particle number ratios at LHC caused, in particular, by the particle annihilations at the afterburn stage is also analyzed.