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 adding final state interactions (including strangeness exchange reactions as well as the inverse reactions required by detailed balance) with a single averaged cross-section $\sigma =0.2$ mb, we can explain the observed hyperon enhancement in PbPb collisions at CERN SPS.

Comments: 6 pages, 2 eps-figures