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

Volodymyr Vovchenko (Institut für Theoretische Physik, Goethe Universität Frankfurt, Frankfurt am Main, Germany; Frankfurt Institute for Advanced Studies, Giersch Science Center, Goethe Universität Frankfurt, Frankfurt am Main, Germany) ; Benjamin Dönigus (Institut für Kernhysik, Goethe Universität Frankfurt, Frankfurt am Main, Germany) ; Horst Stoecker (Institut für Theoretische Physik, Goethe Universität Frankfurt, Frankfurt am Main, Germany; Frankfurt Institute for Advanced Studies, Giersch Science Center, Goethe Universität Frankfurt, Frankfurt am Main, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)

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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      "value": "The statistical model with exact conservation of baryon number, electric charge, and strangeness \u2013 the Canonical Statistical Model (CSM) \u2013 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\u2013Pb 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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Published on:
03 September 2018
Publisher:
Elsevier
Published in:
Physics Letters B , Volume 785 C (2018)

Pages 171-174
DOI:
https://doi.org/10.1016/j.physletb.2018.08.041
Copyrights:
The Authors
Licence:
CC-BY-3.0

Fulltext files: