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We summarise measurements of the COSY-11 collaboration concerning theexcitation functions of the near threshold pseudoscalar meson production in theproton-proton interaction. The results are discussed in the context of themeson-nucleon and hyperon-nucleon interactions. We conclude that the$\eta$-proton interaction is significantly stronger than the eta'-protoninteraction. Similarly, we found that the hyperon Lambda interacts with thenucleon considerably stronger than the hyperon Sigma, and that the interactionof (K-)-proton is much stronger than this of the (K+)-proton.

Near threshold production of the pseudoscalar mesons at the COSY-11 facility