Initial and final state temperatures of antiproton emission sources in high energy collisions

Abstract

The momentum or transverse momentum spectra of antiprotons produced at mid-rapidity in proton-helium ($p$+He), gold-gold (Au+Au), deuton-gold ($d$+Au), and lead-lead (Pb+Pb) collisions over an energy range from a few GeV to a few TeV are analyzed by the Erlang distribution, the inverse power-law (the Hagedorn function), and the blast-wave fit, or the superposition of two-component step function. The excitation functions of parameters such as the mean transverse momentum, initial state temperature, kinetic freeze-out temperature, and transverse flow velocity increase (slightly) from a few GeV to a few TeV and from peripheral to central collisions. At high energy and in central collisions, large collision energy is deposited in the system, which results in high degrees of excitation and expansion.

17 pages, 8 figures. International Journal of Theoretical Physics, accepted

References in corpus (5)

• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Temperature in and out of equilibrium: a review of concepts, tools and attempts
• Relating multihadron production in hadronic and nuclear collisions
• Systematics of Global Observables in Cu+Cu and Au+Au Collisions at RHIC Energies
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Cited by in corpus (8)

• An evidence of triple kinetic freezeout scenario observed in all centrality intervals in Cu-Cu, Au-Au and Pb-Pb collisions at high energies
• Effects of coalescence and isospin symmetry on the freezeout of light nuclei and their anti-particles
• Study of Dependence of Kinetic Freezeout Temperature on the Production Cross Section of Particles in Various Centrality Intervals in Au Au and Pb Pb Collisions at High Energies
• Dependence of temperatures and kinetic freeze-out volume on centrality in Au-Au and Pb-Pb collisions at high energy
• Decoupling of non-strange, strange and multi-strange particles from the system in Cu-Cu, Au-Au and Pb-Pb collisions at high energies
• Excitation function of initial temperature of heavy flavor quarkonium emission source in high energy collisions
• Particle species and energy dependencies of freeze-out parameters in high-energy proton-proton collisions
• Analysis of kinetic freeze out temperature and transverse flow velocity in nucleus-nucleus and proton-proton collisions at same center of mass energy