Deep sub-threshold Ξ and Λ production in nuclear collisions with the UrQMD transport model

G. Graef, J. Steinheimer, F. Li, and M. Bleicher
Phys. Rev. C 90, 064909 – Published 18 December 2014

Abstract

We present results on deep sub-threshold hyperon production in nuclear collisions, with the UrQMD transport model. Introducing anti-kaon+baryon and hyperon + hyperon strangeness exchange reactions we obtain a good description of experimental data on single strange hadron production in Ar+KCl reactions at Elab=1.76A GeV. We find that the hyperon strangeness exchange is the dominant process contributing to the Ξ yield; however, our study remains short of explaining the Ξ/Λ ratio measured with the HADES experiment. We also discuss possible reasons for the discrepancy with previous studies and the experimental results, finding that many details of the transport simulation may have significant effects on the final Ξ yield.

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  • Received 21 October 2014

DOI:https://doi.org/10.1103/PhysRevC.90.064909

©2014 American Physical Society

Authors & Affiliations

G. Graef1, J. Steinheimer1, F. Li2,3, and M. Bleicher1,4

  • 1Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438 Frankfurt am Main, Germany
  • 2Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
  • 3Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
  • 4Institut für Theoretische Physik, Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany

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Issue

Vol. 90, Iss. 6 — December 2014

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