Contributions of hyperon-hyperon scattering to subthreshold cascade production in heavy ion collisions Academic Article uri icon


  • 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. © 2012 American Physical Society.

author list (cited authors)

  • Li, F., Chen, L., Ko, C. M., & Lee, S. H.

citation count

  • 26

publication date

  • June 2012