Transverse momentum and pseudo-rapidity density distributions of charged particles produced in pp and Au–Au collisions at $$\sqrt{{s}_{NN}}=200$$  GeV at RHIC

Abstract

In this paper, we have reported the transverse momentum ( p T ) spectra of averaged charged pions (π ± ), kaons (K ± ), protons and antiprotons in pp and most central 0-6% Au-Au collisions at √ s N N 200 GeV. The simulation is done by models including EPOS-LHC, EPOS-1.99, and QGSJETII-04. The transverse momentum ( p T ) distributions are plotted for π + + π − /2, (K + + K − )/2 and ( p + p)/2 in the p T range of 0 < p T < 3 GeV/c, 0 < p T < 2 GeV/c and 0.5 < p T < 4.5 GeV/c, respectively. We have also plotted the pseudo-rapidity distributions of charged hadrons produced in pp and Au-Au collisions at √ s N N 200 GeV.This analysis also includes the nuclear modification factor (R A A ) which is plotted as a function of p T to study the effects of deconfined medium created in most central Au-Au collisions. Simulation data are compared with the experimental data. The simulated distributions are compared to the RHIC experimental data at √ s N N 200 GeV for both collision systems in order to validate the above-mentioned simulation codes. Although it is observed that a good comparison exists between the models predictions and experimental data but none of them completely describe the experimental data over the entire p T and η range.