Finite resonance widths influence the thermal-model description of hadron yields

Volodymyr Vovchenko, Mark I. Gorenstein, and Horst Stoecker
Phys. Rev. C 98, 034906 – Published 13 September 2018

Abstract

Different scenarios for modeling resonances in a thermal model description of hadron yields measured in heavy-ion collisions are explored: the zero-width approximation, the energy-independent Breit-Wigner scheme, and the energy-dependent Breit-Wigner (eBW) scheme. Application of the eBW scheme leads to a notable suppression in the proton yields, stemming mainly from a reduced feed-down from Δ resonances because of the threshold effects. A significantly improved agreement of a thermal model with hadron yields measured in Pb-Pb collisions at sNN=2.76 TeV by the ALICE Collaboration is obtained in the eBW scheme at T155 MeV, indicating a possible resolution of the so-called “proton anomaly.” The results obtained show that there are significant systematic uncertainties in the thermal model due to the modeling of broad resonances.

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  • Received 16 July 2018

DOI:https://doi.org/10.1103/PhysRevC.98.034906

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Volodymyr Vovchenko1,2, Mark I. Gorenstein2,3, and Horst Stoecker1,2,4

  • 1Institut für Theoretische Physik, Goethe Universität Frankfurt, Max-von-Laue-Strasse 1, D-60438 Frankfurt am Main, Germany
  • 2Frankfurt Institute for Advanced Studies, Giersch Science Center, Goethe Universität Frankfurt, Ruth-Moufang-Strasse 1, D-60438 Frankfurt am Main, Germany
  • 3Bogolyubov Institute for Theoretical Physics, 03680 Kiev, Ukraine
  • 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, D-64291 Darmstadt, Germany

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Issue

Vol. 98, Iss. 3 — September 2018

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