Transverse Energy per Charged Particle in Heavy-Ion Collisions: Role of Collective Flow

Abstract

The ratio of (pseudo)rapidity density of transverse energy and the (pseudo)rapidity density of charged particles, which is a measure of the mean transverse energy per particle, is an important observable in high energy heavy-ion collisions, which reveals about the mechanism of particle production and the freeze-out criteria. Its collision energy and centrality dependence is exactly like the chemical freeze-out temperature till top RHIC energy. The LHC measurement at $\sqrt{s_{NN}}$ = 2.76 TeV brings up new challenges to rule out the mechanisms of gluon saturation or non-equilibrium phenomena being prevalent at high energies, which could contribute to the above observable. The Statistical Hadron Gas Model (SHGM) with a static fireball approximation has been successful in describing both the centrality and energy dependence till top RHIC energies. However, the SHGM predictions for higher energies are highly underestimated by the LHC data. In order to understand this, we have incorporated radial flow effect in an excluded volume SHGM. The hard-core radius of baryons at lower collision energies plays an important role in the description of a hadronic system. In view of this, in order to make a complete energy dependence study from FAIR to LHC energies, we have considered an excluded volume SHGM. Our studies suggest that the collective flow plays an important role in describing $E_T/N_{ch}$ and it could be one of the possible parameters to explain the jump observed in $E_T/N_{ch}$ from RHIC to LHC energies. Predictions for the LHC measurements at $\sqrt{s_{NN}}$ = 5.02 TeV are given.

Same as published version in EPJA

References in corpus (12)

• Bulk Properties of the Medium Produced in Relativistic Heavy-Ion Collisions from the Beam Energy Scan Program
• Measurement of the pseudorapidity and centrality dependence of the transverse energy density in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Effective-energy budget in multiparticle production in nuclear collisions
• Jozso's Legacy: Chemical and Kinetic Freeze-out in Heavy-Ion Collisions
• Transverse Energy per Charged Particle and Freeze-Out Criteria in Heavy-Ion Collisions
• Elliptic flows of light nuclei
• Charged Particle and Photon Multiplicity, and Transverse Energy Production in High-Energy Heavy-Ion Collisions
• Particle multiplicities and particle ratios in excluded volume model
• The statistical hadronization model approach to $\sqrt{s_{NN}}=200$ GeV Au-Au collisions: $p_T$-spectra fits and global variable predictions
• The centrality dependence of transverse energy and charged particle multiplicity at RHIC: Statistical model analysis
• Saturation of $E_T/N_{ch}$ and Freeze-Out Criteria in Heavy-Ion Collisions
• The effect of flow on Hadronic Spectra in an Excluded-Volume Model