Light nuclei production in pp and pA collisions in the Baryon Canonical Ensemble

Abstract

The increase in yields of light nuclei with charged particle multiplicity, as reported by the ALICE collaboration at CERN in p-p and p-Pb collisions at the LHC energy is investigated in the thermal hadron resonance gas model. The model is extended to account for exact baryon number conservation. The focus is on the production of protons, deuterons, ${}^3$He, and ${}_{\Lambda }^3$H. A very good description of proton and deuteron yields is obtained as a function of charged particle multiplicity in the mid-rapidity region using the same fixed temperature as in central Pb-Pb collisions. The yields of light nuclei ${}^3$He and ${}_{\Lambda }^3$H though qualitatively explained as a function of multiplicity, are lower than the model expectation. One of the possible reasons could be that for ${}^3$He and ${}_{\Lambda }^3$H, the chemical equilibrium is not yet reached at small multiplicities.

arXiv comment12 pages, 3 captioned figures

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Cited by in corpus (6)

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• The imprint of conservation laws on correlated particle production
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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 (anti)alpha production in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• More uses for Thermal Models