Light (anti)nuclei production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

The measurement of the production of deuterons, tritons and ${}^3\mathrm{He}$ and their antiparticles in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV is presented in this article. The measurements are carried out at midrapidity ($|y|<$ 0.5) as a function of collision centrality using the ALICE detector. The $p_{\mathrm{T}}$-integrated yields, the coalescence parameters and the ratios to protons and antiprotons are reported and compared with nucleosynthesis models. The comparison of these results in different collision systems at different centre-of-mass collision energies reveals a suppression of nucleus production in small systems. In the Statistical Hadronisation Model framework, this can be explained by a small correlation volume where the baryon number is conserved, as already shown in previous fluctuation analyses. However, a different size of the correlation volume is required to describe the proton yields in the same data sets. The coalescence model can describe this suppression by the fact that the wave functions of the nuclei are large and the fireball size starts to become comparable and even much smaller than the actual nucleus at low multiplicities.

arXiv comment24 pages, 7 captioned figures, authors from page 19, published version, figures at http://alice-publications.web.cern.ch/node/8656

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• Properties of the QCD Matter: A Review of Selected Results from the ALICE Experiment
• Magnetic field effect on hadron yield ratios and fluctuations in a hadron resonance gas
• Measurements of chemical potentials in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
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• Measurement of the production of (anti)nuclei in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV
• Measurement of the low-energy antitriton inelastic cross section
• Effect of Light Nuclei on Chemical Freeze-out Parameters at RHIC Energies
• Production characteristics of light nuclei, hypertritons and $\Omega$-hypernuclei in Pb+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV
• Toward universal coalescence models for antideuteron production
• Flavour-Dependent Chemical Freeze-Out of Light Nuclei in Relativistic Heavy-Ion Collisions
• Hubble's Law in Heavy Ion Collisions
• Interactions of the deuteron with a hadronic medium
• A Data-Guided Coalescence Model for Light Nuclei and Hypernuclei Production in Relativistic Heavy-Ion Collisions at $\sqrt{s_{\mathrm{NN}}}=3$--200 GeV