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Motivated by the ongoing discussion concerning the nature of the scalarresonances f0(980) and a0(980), the COSY-11 collaboration has taken exclusivedata on the pp->ppK+K- reaction near the production threshold. A first totalcross section sigma=(1.80+-0.27+0.28-0.35)nb for the excess energy Q=17 MeV hasbeen determined. In contrary to the eta, omega and eta' single meson productionstudies which clearly show the strong pp final state interaction (FSI), thecross section values obtained at COSY-11 and DISTO can be both described by afit with a four-body phase space including the proton-proton final stateinteraction as well as with one-meson exchange calculations neglecting FSIeffects. Therefore, one might think about a compensation of the strong ppinteraction through a pK- FSI effect or an additional degree of freedom causedby the four-body final state. In the latter case, strong FSI effects can beexpected at Q-values very close to the K+K- production threshold. Such amotivation triggered -- in combination with the investigation of thekaon-Antikaon interaction being relevant to the structure of the f0(980) --further measurements at the excess energies Q=10 and Q=28 MeV at COSY-11.Comment: 5 pages, 4 figures, Presented at X. International Conference On  Hadron Spectroscopy (Hadron 2003), Aschaffenburg, Germany, 31 Aug - 6 Sep  200

Associated strangeness production in pp collisions near threshold