Search for R-parity violating decays of supersymmetric particles in ${\mathrm e}^+{\mathrm e}^-$ collisions at centre-of-mass energies near 183 GeV

Abstract.

Searches for pair-production of supersymmetric particles under the assumption that R-parity is violated via a single dominant $LL{\bar E}$, $LQ{\bar D}$ or ${\bar U}{\bar D}{\bar D}$ coupling are performed using the data collected by the ALEPH collaboration at centre-of-mass energies of 181–184 GeV. The observed candidate events in the data are in agreement with the Standard Model expectations. Upper limits on the production cross-sections and lower limits on the masses of charginos, sleptons, squarks and sneutrinos are derived.