Effect of nuclear density profile on the global properties in O+O collisions at the Large Hadron Collider using a multi-phase transport model

Abstract

Oxygen ( 16 O) ions are planned to be injected at the Large Hadron Collider (LHC) in its next runs and a day of physics run is anticipated for O+O collisions at √ sNN = 7 TeV. As the system size of O+O collisions is in between those produced in pp and p+Pb collisions, the study of global properties in O+O collisions may provide a deeper insight into the heavy-ion-like behavior observed in small collision systems and its similarities/differences with larger system like Pb+Pb collisions.In the present work, we report the predictions for global properties in O+O collisions at √ sNN = 7 TeV using a multi-phase transport model (AMPT). We report the mid-rapidity charged particle multiplicity, transverse mass, Bjorken energy density, pseudorapidity distributions, speed of sound, transverse momentum (pT) spectra, the kinetic freeze-out parameters and pT-differential particle ratio as a function of collision centrality. Further, we have studied the transverse momentum dependent elliptic flow of charged particles. The results are shown for Woods-Saxon and harmonic oscillator nuclear density profiles incorporated inside oxygen nucleus. With the change of the density profile with harmonic oscillator from Woods-Saxon, a modification of average charged-particle multiplicity at most central collisions is seen. Bjorken energy density show a significant increase in most central collisions for harmonic oscillator density profile while other global properties show less dependence on the density profiles considered in this work.