Classical excluded volumes of loosely bound light (anti)nuclei and their chemical freeze-out in heavy ion collisions

Abstract

From the analysis of light (anti)nuclei multiplicities that were measured recently by the ALICE collaboration in Pb+Pb collisions at the center-of-mass collision energy $\sqrt{s_{NN}}=2.76$ TeV there arose a highly non-trivial question about the excluded volume of composite particles. Surprisingly, the hadron resonance gas model (HRGM) is able to perfectly describe the light (anti)nuclei multiplicities under various assumptions. Thus, one can consider the (anti)nuclei with a vanishing hard-core radius (as the point-like particles) or with the hard-core radius of proton, but the fit quality is the same for these assumptions. It is clear, however, that such assumptions are unphysical. Hence we obtain a formula for the classical excluded volume of loosely bound light nuclei consisting of A baryons. To implement a new formula into the HRGM we have to modify the induced surface tension concept to treat the hadrons and (anti)nuclei on the same footing. We perform a simultaneous analysis of hadronic and (anti)nuclei multiplicities measured by the ALICE collaboration. The HRGM with the induced surface tension allows us to verify different assumptions on the values of hard-core radii and different scenarios of chemical freeze-out of light (anti)nuclei. It is shown that the unprecedentedly high quality of fit ${\chi }_{tot}^2/dof\simeq 0.769$ is achieved, if the chemical freeze-out temperature of hadrons is about $T_h=150$ MeV, while the one for all (anti)nuclei is $T_A=174-175.2$ MeV.

arXiv comment15 pages, 2 figures

References in corpus (26)

• Hadron production in central nucleus-nucleus collisions at chemical freeze-out
• Production of light nuclei and anti-nuclei in pp and Pb-Pb collisions at LHC energies
• Confronting LHC data with the statistical hadronization model
• ${}_{\Lambda }^3\mathrm{H}$ and ${}_{\bar{\Lambda }}^3\overline{\mathrm{H}}$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Antimatter production in proton-proton and heavy-ion collisions at ultrarelativistic energies
• Loosely-bound objects produced in nuclear collisions at the LHC
• Chiral symmetry restoration in heavy-ion collisions at intermediate energies
• Strange freezeout
• Chiral symmetry restoration versus deconfinement in heavy-ion collisions at high baryon density
• Chemical Freeze-out of Strange Particles and Possible Root of Strangeness Suppression
• The statistical multifragmentation model for liquid-gas phase transition with a compressible nuclear liquid
• Hadron Resonance Gas Model with Induced Surface Tension
• Simple Solution to the Strangeness Horn Description Puzzle
• Hadron yields, the chemical freeze-out and the QCD phase diagram
• Omega, J/psi and psi' Production in Nuclear Collisions and Quark Gluon Plsama Hadronization
• The Flow Constraint Influence on the Properties of Nuclear Matter Critical Endpoint
• Thermodynamically Anomalous Regions As A Mixed Phase Signal
• Mapping out the QCD phase transition in multiparticle production
• Transverse Momentum Spectra of $J/\psi$ and ${\psi }^{\prime }$ Mesons from Quark Gluon Plasma Hadronization in Nuclear Collisions
• Threshold Collision Energy of the QCD Phase Diagram Tricritical Endpoint
• New Signals of Quark-Gluon-Hadron Mixed Phase Formation
• Hard-core Radius of Nucleons within the Induced Surface Tension Approach
• Self-consistent Treatment of Quantum Gases of D-dimensional Hard Spheres Beyond the Van der Waals Approximation
• On separate chemical freeze-outs of hadrons and light (anti)nuclei in high energy nuclear collisions
• Possible signals of two QCD phase transitions at NICA-FAIR energies
• On the thermal phase structure of QCD at vanishing chemical potentials

Cited by in corpus (1)

• Induced surface and curvature tension equation of state for hadron resonance gas in finite volumes and its relation to morphological thermodynamics