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arXiv · 1808.05245

Multiplicity dependence of light nuclei production at LHC energies in the canonical statistical model

Volodymyr Vovchenko·Benjamin Donigus·Horst Stoecker
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Abstract

The statistical model with exact conservation of baryon number, electric charge, and strangeness - the Canonical Statistical Model (CSM) - is used to analyze the dependence of yields of light nuclei at midrapidity on charged pion multiplicity at the LHC. The CSM calculations are performed assuming baryon-symmetric matter, using the recently developed Thermal-FIST package. The light nuclei-to-proton yield ratios show a monotonic increase with charged pion multiplicity, with a saturation at the corresponding grand-canonical values in the high-multiplicity limit, in good qualitative agreement with the experimental data measured by the ALICE collaboration in pp and Pb-Pb collisions at different centralities and energies. Comparison with experimental data at low multiplicities shows that exact conservation of charges across more than one unit of rapidity and/or a chemical freeze-out temperature which decreases with the charged pion multiplicity improves agreement with the data.

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Volodymyr Vovchenko, Benjamin Donigus, Horst Stoecker. 2018-08-15. Multiplicity dependence of light nuclei production at LHC energies in the canonical statistical model. https://doi.org/10.1016/j.physletb.2018.08.041

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