Single-freeze-out model for ultra relativistic heavy-ion collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV and the LHC proton puzzle

Abstract

The single-freeze-out model with parametrized hypersurface and flow geometry is employed to analyze the transverse-momentum spectra of hadrons produced in the Pb+Pb collisions at the collision energy of {$\sqrt{s_{\mathrm{NN}}}=2.76$ TeV} at the CERN Large Hadron Collider (LHC). With the notable exception for protons and antiprotons, we find a very good agreement between the model results and the data for the measured hadron species. The additional analysis of the HBT radii of pions helps us to select, from several different types of freeze-out studied in this work, the most realistic form of the freeze-out hypersurface. We find that discrepancy ratio between the model and experiment for the proton/antiproton spectra depends on $p_T$, dropping from 2 in the soft region to 1 around $p_T=1.5$ GeV.

9 pages, 10 figures

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Cited by in corpus (14)

• Particle spectra in Pb-Pb collisions at 2.76 TeV
• Hadron production and QGP Hadronization in Pb--Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV
• Explanation of hadron transverse-momentum spectra in heavy-ion collisions at sqrt(sNN) = 2.76 TeV within chemical non-equilibrium statistical hadronization model
• The Freezeout Hypersurface at LHC from particle spectra: Flavor and Centrality Dependence
• Using the Tsallis distribution for hadron spectra in $pp$ collisions: Pions and quarkonia at $\sqrt{s}$ = 5--13000 GeV
• Transverse-momentum spectra of strange particles produced in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV in the chemical non-equilibrium model
• Universal hadronization condition in heavy ion collisions at $\sqrt{s_{\mathrm{NN}}}=62$ GeV and at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Kinetic freeze-out, particle spectra and harmonic flow coefficients from mode-by-mode hydrodynamics
• Contrasting Freezeouts in Large Versus Small Systems
• Freezeout conditions in proton-proton collisions at the top RHIC and LHC energies
• Blast-wave description of ${\rm Y}$ elliptic flow at energies available at the CERN Large Hadron Collider
• Thermal model for Pb+Pb collisions at ${\sqrt{s}}_{NN}=2.76$ TeV with explicit treatment of hadronic ground states
• Study of Centrality Dependence of Kinetic Freeze-out Conditions in Pb + Pb Collisions at Root(sNN)= 2.76 TeV
• Locally anisotropic momentum distributions of hadrons at freeze-out in relativistic heavy-ion collisions