High resolution study of the Λp final state interaction in the reaction p+p→K++(Λp)

The reaction pp→K++(Λp) was measured at Tp=1.953GeV and Θ=0° with a high missing mass resolution in order to study the Λp final state interaction. The large final state enhancement near the Λp threshold can be described using the standard Jost-function approach. The singlet and triplet scattering lengths and effective ranges are deduced by fitting simultaneously the Λp invariant mass spectrum and the total cross section data of the free Λp scattering.