Supersymmetric Unification with Radiative Breaking of R-parity
  We show how R-parity can break spontaneously as a result of radiative corrections in unified N=1 supergravity models. We illustrate this with a concrete rank-four unified model, where the spontaneous breaking of R-parity is accompanied by the existence of a physical majoron. We determine the resulting supersymmetric particle mass spectrum and show that R-parity-breaking signals may be detectable at LEP200. 
J. C. Romao (IST, Lisbon), A. Ioannissyan and J.W.F. Valle (U.   Valencia, IFIC/CSIC)