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Hyperon production in the threshold region was studied in the reaction pp ->K+Lp using the time-of-flight spectrometer COSY-TOF. Exclusive data, coveringthe full phase-space, were taken at the three different beam momenta ofp_beam=2.95, 3.20 and 3.30 GeV/c, corresponding to excess energies ofepsilon=204, 285 and 316 MeV, respectively. Total cross-sections were deducedfor the three beam momenta to be 23.9+/-0.8 +/-2.0 ub, 28.4+/-1.3 +/-2.2 ub and35.0+/-1.3 +/-3.0 ub. Differential observables including Dalitz plots wereobtained. The analysis of the Dalitz plots reveals a strong influence of theN(1650)-resonance at p_beam=2.95 GeV/c, whereas for the higher momenta anincreasing relative contribution of the N(1710)- and/or of theN(1720)-resonance was observed. In addition, the pL-final-state interactionturned out to have a significant influence on the Dalitz plot distribution.

Influence of N*-resonances on hyperon production in the channel pp->K+ Lambda p at 2.95, 3.20 and 3.30 GeV/c beam momentum