Hyperon enhancement in the dual parton model

Abstract

We review the two sources of hyperon enhancement in the dual parton model: strings originating from diquark-antidiquark pairs in the nucleon sea and net baryons containing two or three sea quarks with a yield controlled by the observed stopping. We show that by adding final state interactions (including strangeness exchange reactions as well as the inverse reactions required by detailed balance) with a single averaged cross section, σ = 0.2 mb, we can explain the observed hyperon enhancement in PbPb collisions at CERN SPS.