6 v 1 1 7 Ju n 19 98 Asymmetry studies in Λ 0 / Λ̄ 0 , Ξ − / Ξ + and Ω − / Ω + production

We present a study on hyperon/anti-hyperon production asymmetries in the framework of the recombination model. The production asymmetries for Λ/Λ̄, Ξ/Ξ and Ω/Ω are studied as a function of xF . Predictions of the model are compared to preliminary data on hyperon/anti-hyperon production asymmetries in 500 GeV/c π−p interactions from the Fermilab E791 experiment. The model predicts a growing asymmetry with the number of valence quarks shared by the target and the produced hyperons in the xF < 0 region. In the positive xF region, the model predicts constant asymmetries for Λ/Λ̄ and Ω/Ω production and a growing asymmetry with xF for Ξ /Ξ. We found a qualitatively good agreement between the model predictions and data, showing that recombination is a competitive mechanism in the hadronization process.