TY - JOUR
T1 - Contributions of hyperon-hyperon scattering to subthreshold cascade production in heavy ion collisions
AU - Li, Feng
AU - Chen, Lie Wen
AU - Ko, Che Ming
AU - Lee, Su Houng
PY - 2012/6/6
Y1 - 2012/6/6
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevC.85.064902
DO - 10.1103/PhysRevC.85.064902
M3 - Article
AN - SCOPUS:84862854463
SN - 0556-2813
VL - 85
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 6
M1 - 064902
ER -