Freezeout conditions in proton-proton collisions at the top RHIC and LHC energies

Abstract

The freezeout conditions in proton-proton collisions at $\sqrt{s_{\text{NN}}}=200$, $900$ and $7000$ GeV have been extracted by fits to the mean hadron yields at mid-rapidity within the framework of the statistical model of an ideal gas of hadrons and resonances in the grand canonical ensemble. The variation of the extracted freezeout thermal parameters and the goodness of the fits with $\sqrt{s_{\text{NN}}}$ are discussed. We find the extracted temperature and baryon chemical potential of the freezeout surface to be similar in p+p and heavy ion collisions. On the other hand, the thermal behaviour of the strange hadrons is qualitatively different in p+p as compared to A+A. We find an additional parameter accounting for non-equilibrium strangeness production is essential for describing the p+p data. This is in contrast to A+A where the non-equilibrium framework could be successfully replaced by a sequential and complete equilibrium model with an early freezeout of the strange hadrons.

version accepted for publication to Phys. Rev. C

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Cited by in corpus (12)

• Kinetic freeze-out temperatures in central and peripheral collisions: Which one is larger?
• Multiplicity dependence of (multi-)strange baryons in the canonical ensemble with phase shift corrections
• Multiplicity Dependence of Non-extensive Parameters for Strange and Multi-Strange Particles in Proton-Proton Collisions at $\sqrt{s}=7$ TeV at the LHC
• Effects of coalescence and isospin symmetry on the freezeout of light nuclei and their anti-particles
• Contrasting Freezeouts in Large Versus Small Systems
• Bottom hadro-chemistry in high-energy hadronic collisions
• Thermodynamics of a gas of hadrons with attractive and repulsive interaction within S-matrix formalism
• Statistical hadron-gas treatment of systems created in proton-proton interactions at CERN SPS
• Role of system size on freezeout conditions extracted from transverse momentum spectra of hadrons
• Freeze-out and thermalization in relativistic heavy ion collisions
• Multiplicity dependence freeze-out scenarios in pp collisions at $\sqrt{s}$ = 7 TeV
• Exact strangeness conservation in heavy ion collisions