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

Volodymyr Vovchenko,Benjamin Dönigus,Horst Stoecker

doi:10.1016/j.physletb.2018.08.041

Volodymyr Vovchenko, Benjamin Dönigus + Show 1 more

Open Access

https://doi.org/10.1016/j.physletb.2018.08.041

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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.

Highlights

The light nuclei-toproton 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
Relative hadron yields measured in heavy-ion collisions at various energies are known to be described surprisingly well by the thermal-statistical model [1,2,3], which in the simplest case represents a non-interacting gas of known hadrons and resonances in the grand canonical ensemble

Summary

Introduction

Relative hadron yields measured in heavy-ion collisions at various energies are known to be described surprisingly well by the thermal-statistical model [1,2,3], which in the simplest case represents a non-interacting gas of known hadrons and resonances in the grand canonical ensemble (see, e.g., Ref. [4] for an overview). 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.

Results

Conclusion