The Unified Hydrodynamics and the Pseudorapidity Distributions in Heavy Ion Collisions at BNL-RHIC and CERN-LHC Energies

TL;DR

This paper presents a unified hydrodynamic model to analytically describe the rapidity distributions of charged particles in heavy-ion collisions at BNL-RHIC and CERN-LHC energies, showing good agreement with experimental data.

Contribution

It introduces a unified hydrodynamics approach to model both hot dense matter and leading particles in heavy-ion collisions, providing analytical formulas for rapidity distributions.

Findings

The model accurately reproduces experimental rapidity distributions.

Unified hydrodynamics effectively describes particle production in heavy-ion collisions.

Analytical results align well with measurements at BNL-RHIC and CERN-LHC.

Abstract

The charged particles produced in nucleus-nucleus collisions are divided into two parts. One is from the hot and dense matter created in collisions. The other is from leading particles. The hot and dense matter is assumed to expand according to unified hydrodynamics and freezes out into charged particles from a space-like hypersurface with a fixed proper time of Tau_FO.The leading particles are conventionally taken as the particles which inherit the quantum numbers of colliding nucleons and carry off most of incident energy. The rapidity distributions of the charged particles from these two parts are formulated analytically, and a comparison is made between the theoretical results and the experimental measurements performed in Au-Au and Pb-Pb collisions at the respective BNL-RHIC and CERN-LHC energies. The theoretical results are well consistent with experimental data.