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Measurements of the pp-->ppK+K- reaction, performed with the experimentCOSY-11 at the Cooler Synchrotron COSY, show a significant difference betweenthe obtained excitation function and theoretical expectations including pp-FSI>. The discrepancy may be assigned to the influence of K+K- or K-p interaction.This interaction should manifest itself in the distributions of thedifferential cross section. This thesis presents an analysis of eventdistributions as a function of the invariant masses of two particle subsystems.In particular in the analysis two generalizations of the Dalitz plot proposedby Goldhaber and Nyborg are used. The present Investigations are based on theexperimental data determined by the COSY-11 collaboration from two measurementsat excess energies of Q = 10 MeV and 28 MeV. The experimental distributions arecompared to results of Monte Carlo simulations generated with variousparameters of the K+K- and K-p interaction. The values of the K+K- scatteringlength, extracted from two data sets for Q = 10 MeV and 28 MeV amount to:a_K+K- = (11 +- 8) + i(0 +- 6) fm for Q = 10 MeV, and a_K+K- = (0.2 +-0.2) +i(0.0 +- 0.5) fm for Q = 28 MeV, Due to the low statistics, the extractedvalues have large uncertainties and are consistent with very low values of thereal and imaginary part of the scattering length.

Analysis of the differential cross sections for the reaction pp --> ppK+K- in view of the K+K- interaction