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We study the pp -> p Lambda K+ and pp -> p Sigma0 K+ reactions near thresholdby using a chiral unitary approach. We consider the single-pion and single-kaonexchange as well as the final state interactions of nucleon-hyperon, K-hyperonand K-nucleon systems. Our results on the total cross section of the pp -> pLambda K+ reaction is consistent with the experimental data, and theexperimental observed strong suppression of Sigma0 production compared toLambda production at the same excess energy can also be explained in our model.

The pp -> p Lambda K+ and pp -> p Sigma0 K+ Reactions in the Chiral Unitary Approach