Summary of the COSY-11 Measurements of Hyperon Production

The studies of hyperon production performed at COSY-11 are summarized. The results of the experiments in the reaction channels pp → pK+Λ, pp → pK+Σ0, and pp → nK+Σ+ are shown. Excitation functions from threshold up to about 90 MeV excess energies have been evaluated with high precision for the Λ and Σ0 production. The Λp and Σ0 p final state interactions were extracted. The Σ+ production was measured at 13 and 60 MeV excess energies.