Dependence of temperatures and kinetic freeze-out volume on centrality in Au-Au and Pb-Pb collisions at high energy

Abstract

Centrality-dependent double-differential transverse momentum spectra of negatively charged particles (${\pi }^{-}$, $K^{-}$ and $\bar{p}$) at mid-(pseudo)rapidity interval in nuclear collisions are analyzed by the standard distribution in terms of multi-component. The experimental data measured in gold-gold (Au-Au) collisions by the PHENIX Collaboration at the Relativistic Heavy Ion Collider (RHIC) and in lead-lead (Pb-Pb) collisions by the ALICE Collaboration at the Large Hadron Collider (LHC) are studied. The effective temperature, initial temperature, kinetic freeze-out temperature, transverse flow velocity and kinetic freeze-out volume are extracted from the fitting to transverse momentum spectra. We observed, that the mentioned five quantities increase with the increase of event centrality due to the fact that the average transverse momentum increases with the increase of event centrality. This renders that larger momentum (energy) transfer and further multiple-scattering had happened in central centrality.

15 pages, 9 figures. Advances in High Energy Physics, accepted

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• Pseudorapidity dependence of the $p_T$ spectra of charged hadrons in $pp$ collisions at $\sqrt{s}$ = 0.9 and 2.36 TeV
• Extraction of different temperatures and kinetic freeze-out volume in high energy collisions
• Specific heat and its high-order moments in relativistic heavy-ion collisions from a multiphase transport model
• Multiplicity dependence of the freezeout parameters in high energy hadron-hadron collisions
• Particle species and energy dependencies of freeze-out parameters in high-energy proton-proton collisions