Contributions of hyperon-hyperon scattering to subthreshold cascade production in heavy ion collisions

Feng Li, Lie Wen Chen, Che Ming Ko, Su Houng Lee

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Using a gauged flavor SU(3)-invariant hadronic Lagrangian, we calculate the cross sections for the strangeness-exchange reactions YY↔NΞ (Y=Λ,Σ) in the Born approximation. These cross sections are then used in the relativistic Vlasov-Uehling-Uhlenbeck transport model to study Ξ production in Ar+KCl collisions at incident energy of 1.76A GeV and impact parameter b=3.5 fm. We find that including the contributions of hyperon-hyperon scattering channels strongly enhances the yield of Ξ, leading to the abundance ratio Ξ-/(Λ+Σ0)=3.38×10-3, which is essentially consistent with the recently measured value of (5.6±1.2-1.7+1.8)×10-3 by the HADES Collaboration at GSI.

Original languageEnglish
Article number064902
JournalPhysical Review C - Nuclear Physics
Issue number6
Publication statusPublished - 2012 Jun 6


All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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