Search for R-parity violating decays of supersymmetric particles in e + e − collisions at √ s = 189 GeV

A search for chargino, neutralino and scalar lepton pair-production in collisions at the centre-of-mass energy of 189 GeV is performed under the assumptions that R-parity is not conserved in decays and only one of the coupling constants or is non-negligible. No signal is found in a data sample corresponding to an integrated luminosity of 176.4 pb. Limits on the production cross sections, on the Minimal Supersymmetric Standard Model parameters and on the masses of the supersymmetric particles are derived.