Different production sources of light nuclei in relativistic heavy-ion collisions

Abstract

We propose a new method, i.e., an exclusive quark combination model + an inclusive hadron recombination model, to study different production sources of light nuclei in relativistic heavy-ion collisions. We take deuterons and ${}^3$He produced in Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV as examples to present contributions of different production sources by studying their rapidity densities $dN/dy$, yield ratios and transverse momentum ($p_T$) spectra just after the hadronization as well as at the final kinetic freeze-out. We find that: only very small fractions of $d$ and ${}^3$He are created just after the hadronization; nucleons from $\Delta$ resonance decays make a much larger contribution to the regeneration of light nuclei at the hadronic phase stage, and this contribution takes about 79\% and 92\% for $d$ and ${}^3$He, respectively, observed at the final kinetic freeze-out. We also find that yield ratios $d/p$, ${}^3$He$/p$ and ${}^3$He$/d$ are good observables to probe contributions for light nuclei from different production sources, and provide a natural explanation for constant values of $d/p$ and ${}^3$He$/p$ as a function of the averaged charged multiplicity measured by the ALICE Collaboration.

arXiv comment12 pages, 2 figures

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Cited by in corpus (4)

• Production of light nuclei at colliders -- coalescence vs. thermal model
• Production of ${}^4\mathrm{Li}$ and $p-{}^3\mathrm{He}$ correlation function in relativistic heavy-ion collisions
• Momentum dependence of light nuclei production in pp, p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider
• Production characteristics of light (anti-)nuclei from (anti-)nucleon coalescence in heavy ion collisions at energies employed at the RHIC beam energy scan