ABSTRACT
It has been shown recently [4] that if the neutrino is a massive Majorana field the low energy effective theory of the supersymmetric extension of the
Standard Model [5] will contain mass terms for the sneutrino which violate lepton number too, regardless of the mechanism which is responsible for the generation of sneutrino masses in the unbroken theory. In [6] a model containing heavy SU(2) singlet sneutrino fields and L-violating mass terms involving these fields has been examined (such models have been considered previously in connection with the generation of the Baryon Asymmetry of the Universe (BAU) at some high temperature, see e.g. [7]). In both cases below the electroweak symmetry breaking scale the weak states i/, i/* are no longer mass states and the resulting mass states violate L, exhibit a mass splitting and give rise to L-violating processes which have been analyzed e.g. for the Next Linear Collider in [8] and for Ov(3(3 decay in [9].
