Search for R-parity violation with a U D D coupling at p s = 189 GeV

Searches for pair production of gauginos and squarks in e + e collisions at a centreof-mass energies of 192, 196, 200 and 202 GeV have been performed on data corresponding to an integrated luminosity of 226 pb 1 collected by the DELPHI detector at LEP. The data were analyzed under the assumption of non-conservation of R-parity through a single dominant U D D coupling between squarks and quarks. Typical nal states contain between 4 and 10 jets with or without additional leptons. No excess of data above Standard Model expectations was observed. The results were used to constrain domains of the MSSM parameter space and derive limits on the masses of supersymmetric particles.