Hyperon enhancement in the dual parton model

We review the two sources of hyperon enhancement in the dual parton model: strings originating from diquark-antidiquark pairs in the nucleon sea and n et baryons containing two or three sea quarks with a yield controlled by th e observed stopping. We show that by adding final state interactions (inclu ding strangeness exchange reactions as well as the inverse reactions requir ed by detailed balance) with a single averaged cross section, sigma = 0.2 m b, we can explain the observed hyperon enhancement in PbPb collisions at CE RN SPS.