Canonical statistical model analysis of pp, p-Pb, and Pb-Pb collisions at energies available at the CERN Large Hadron Collider

Volodymyr Vovchenko (Institut für Theoretische Physik, Goethe Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany; Frankfurt Institute for Advanced Studies, Giersch Science Center, Goethe Universität Frankfurt, Ruth-Moufang-Straße 1, D-60438 Frankfurt am Main, Germany) ; Benjamin Dönigus (Institut für Kernphysik, Goethe Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany) ; Horst Stoecker (Institut für Theoretische Physik, Goethe Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany; Frankfurt Institute for Advanced Studies, Giersch Science Center, Goethe Universität Frankfurt, Ruth-Moufang-Straße 1, D-60438 Frankfurt am Main, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, D-64291 Darmstadt, Germany)

The system-size dependence of hadrochemistry at vanishing baryon density is considered within the canonical statistical model (CSM) with local exact conservation of three conserved charges, allowing for a possibility of strangeness undersaturation, i.e., γS1. Exact baryon number conservation is found to be even more important than that of strangeness in the canonical suppression picture at the CERN Large Hadron Collider, in contrast to intermediate and low collision energies. The model is applied to pp, p-Pb, and Pb-Pb data of the ALICE Collaboration. A chemical equilibrium CSM with a fixed Tch=155 MeV describes the trends seen in most yield ratios. However, this “vanilla” version of CSM predicts an enhancement of the ϕ/π ratio at smaller multiplicities, in stark contrast to the suppression seen in the data. The data are described with a 15% relative accuracy level whence a multiplicity dependence of both the temperature and the strangeness saturation parameter γS1 is accepted. Both the canonical suppression and the strangeness undersaturation effects are small at dNch/dη100, but they do improve substantially the description of hadron yields in pp collisions, in particular the Ω yields. A possibility to constrain the rapidity correlation volume using net-proton fluctuation measurements is pointed out.

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      "title": "Canonical statistical model analysis of <math><mrow><mi>p</mi><mtext>\u2212</mtext><mi>p</mi></mrow></math>, <math><mi>p</mi></math>-Pb, and Pb-Pb collisions at energies available at the CERN Large Hadron Collider"
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      "source": "APS", 
      "value": "The system-size dependence of hadrochemistry at vanishing baryon density is considered within the canonical statistical model (CSM) with local exact conservation of three conserved charges, allowing for a possibility of strangeness undersaturation, i.e., <math><mrow><msub><mi>\u03b3</mi><mi>S</mi></msub><mo>\u2264</mo><mn>1</mn></mrow></math>. Exact baryon number conservation is found to be even more important than that of strangeness in the canonical suppression picture at the CERN Large Hadron Collider, in contrast to intermediate and low collision energies. The model is applied to <math><mrow><mi>p</mi><mtext>\u2212</mtext><mi>p</mi></mrow></math>, <math><mi>p</mi></math>-Pb, and Pb-Pb data of the ALICE Collaboration. A chemical equilibrium CSM with a fixed <math><mrow><msub><mi>T</mi><mi>ch</mi></msub><mo>=</mo><mn>155</mn></mrow></math> MeV describes the trends seen in most yield ratios. However, this \u201cvanilla\u201d version of CSM predicts an enhancement of the <math><mrow><mi>\u03d5</mi><mo>/</mo><mi>\u03c0</mi></mrow></math> ratio at smaller multiplicities, in stark contrast to the suppression seen in the data. The data are described with a 15% relative accuracy level whence a multiplicity dependence of both the temperature and the strangeness saturation parameter <math><mrow><msub><mi>\u03b3</mi><mi>S</mi></msub><mo>\u2264</mo><mn>1</mn></mrow></math> is accepted. Both the canonical suppression and the strangeness undersaturation effects are small at <math><mrow><mi>d</mi><msub><mi>N</mi><mi>ch</mi></msub><mo>/</mo><mi>d</mi><mi>\u03b7</mi><mo>\u2273</mo><mn>100</mn></mrow></math>, but they do improve substantially the description of hadron yields in <math><mrow><mi>p</mi><mtext>\u2212</mtext><mi>p</mi></mrow></math> collisions, in particular the <math><mi>\u03a9</mi></math> yields. A possibility to constrain the rapidity correlation volume using net-proton fluctuation measurements is pointed out."
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Published on:
25 November 2019
Publisher:
APS
Published in:
Physical Review C , Volume 100 (2019)
Issue 5
DOI:
https://doi.org/10.1103/PhysRevC.100.054906
arXiv:
1906.03145
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: