[en] Searches for pair-production of supersymmetric particles under the assumption that R-parity is violated via a single dominant LL anti E,LQ anti D or anti U anti D anti 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. (orig.)

[en] In most supersymmetric theories charginos, χ_1,2^±, belong to the class of the lightest supersymmetric particles. The chargino system can be reconstructed completely in e⁺e^- collider experiments: e⁺e^- → χ_i⁺χ_j^- [i,j=1,2]. By measuring the total cross sections and the asymmetries with polarized beams, the chargino masses and the gaugino-higgsino mixing angles of these states can be determined accurately. If only the lightest charginos χ₁^± are kinematically accessible in a first phase of the machine, transverse beam polarization or the measurement of chargino polarization in the final state is needed to determine the mixing angles. From these observables the fundamental SUSY parameters can be derived: the SU(2) gaugino mass M₂, the modulus and the cosine of the CP-violating phase of the higgsino mass parameter μ, and tan β=υ₂/υ₁, the ratio of the vacuum expectation values of the two neutral Higgs doublet fields. The remaining two-fold ambiguity of the phase can be resolved by measuring the normal polarization of the charginos. Sum rules of the cross sections can be exploited to investigate the closure of the two-chargino system. (orig.)