Lepton-Flavor Violating Decays of the $Z$-boson in a Left-Right   Supersymmetric Model
  We study the one-loop supersymmetric contributions to lepton-flavor violating $Z$ -boson decays in a fully left-right symmetric model. In addition to right-handed scalar neutrinos, the decays could receive important contributions from doubly-charged triplet Higgsinos which couple to leptons only. We find that the decay widths reach present experimental bounds and discuss mass constraints for the contributing supersymmetric partners. 
M. Frank and H. Hamidian