The near threshold total cross sections for the pp->pp eta' and pp->ppK+K- reactions has been measured at the COSY-11 facility. Possible production mechanisms are discussed. The energy dependence of the total cross section for the both reactions disagrees with predictions based on the phase space volume and the proton-proton final state interaction.
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Publication: Act.Phys.Pol. B 29 (1998) 3091-3099