Recent results obtained by the COSY-11 collaboration concerning the production of eta and eta' mesons in the pp->pp Meson reaction are presented. A comparison of the production amplitude for the pi0, eta, and eta' mesons at the same phase space volume allows to conclude that the proton-eta' interaction is in the order of, or smaller than, the proton-pi0 one.
A total cross section determined in a preliminary analysis of the data of elementary kaon and antikaon production via the pp->ppK+K- reaction measured at excess energy of Q = 17 MeV is reported.
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Publication: Act.Phys.Pol. B 31 (2000) 2277-2284