Determination of N* amplitudes from associated strangeness production in p plus p collisions

Abstract

We present the first determination of the energy-dependent amplitudes of N* resonances extracted from their decay in K Lambda pairs in p+p -> pK(+)Lambda reactions. A combined Partial Wave Analysis of seven data samples with exclusively reconstructed p+p -> pK(+)Lambda events measured by the COSY-TOF, DISTO, FOPI and HADES Collaborations in fixed target experiments at kinetic energies between 2.14 to 3.5 GeV is used to determine the amplitude of the resonant and non-resonant contributions into the associated strangeness final state. The contribution of seven N* resonances with masses between 1650 MeV/c(2) and 1900 MeV/c(2)for an excess energy between 0 and 600 MeV has been considered. The Sigma-p cusp and final state interactions for the p-Lambda channel are also included as coherent contributions in the PWA. The N* contribution is found to be dominant with respect to the phase space emission of the pK(+)Lambda final state at all energies demonstrating the important role played by both N* and interference effects in hadronhadron collisions. (C) 2018 The Author(s). Published by Elsevier B.V.