Kinetic Freeze-Out Temperature and Transverse Flow Velocity in Au-Au Collisions at RHIC-BES Energies

Muhammad Waqas,Bao-Chun Li

doi:10.1155/2020/1787183

Abstract

By using the method of data-driven reanalysis, the midrapidity transverse momentum pT spectra of charged hadrons (π+, K+, and p) produced in central and peripheral gold-gold (Au-Au) collisions from the Beam Energy Scan (BES) program at the Relativistic Heavy Ion Collider (RHIC) are fitted by using the blast-wave model with the Boltzmann-Gibbs statistics. The model results are in agreement with the experimental data measured by the STAR Collaboration at the RHIC-BES energies. We observe that the kinetic freeze-out temperature T0, transverse flow velocity βT, mean transverse momentum pT, and initial temperature Ti increase with collision energy as well as with event centrality.

Highlights

One of the most fundamental questions in high energy and nuclear physics is to determine the phase structure of the strongly interacting quantum chromodynamics (QCD) matter [1,2,3]
The symbols represent the experimental data measured by the STAR Collaboration [19], and the curves are our fitting results by using the blast-wave model with the Boltzmann-Gibbs statistics, Equation (1) [21,22,23]
One can see that Equation (1) fits well the data in Au-Au collisions at 11.5 GeV at the Relativistic Heavy Ion Collider (RHIC)-Beam Energy Scan (BES)

Summary

Introduction

One of the most fundamental questions in high energy and nuclear physics is to determine the phase structure of the strongly interacting quantum chromodynamics (QCD) matter [1,2,3]. The yield ratios, transverse momentum ðpTÞ spectra, and other data for various identified particles produced in proton-proton ðppÞ, proton-nucleus (pA), and nucleus-nucleus (AA) collisions at high energies are important observable quantities for determining the phase structure. The experimental facilities such as the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) provide excellent tools to study the properties of Quark-Gluon Plasma (QGP) [4,5,6], which are expected to create collision events with high multiplicities. Other experiments at similar or lower energies at other accelerators are scheduled [14, 15]

Methods

Results

Conclusion