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Threshold production in antinucleon-nucleon interactions

Two experiments near the kinematical threshold in antiproton-proton collisions are presented. They are carried out at the CERN low energy antiproton facility LEAR. The experiments investigate different aspects of strangeness production. The PS185 experiment studies the production of antihyperon-hyperon pairs. Data on total and differential cross sections, polarisations and spin correlations are presented. The results are discussed in connection to proposed quark based or meson exchange models for these reactions. The PS202 experiment (JETSET) measures the production of four charged kaons to identify the ϕϕ reaction channel. The purpose is to search for resonances in the excitation function. They might signal exotic states of matter such as glueballs or hybrids. First preliminary results are discussed.