ANOMALOUS VECTOR-BOSON COUPLINGS IN MAJORANA NEUTRINO MODELS

We examine the contributions of Majorana neutrinos to CP-violating WWZ and ZZZ self-couplings, using a model in which sterile neutrinos coup le to the W and Z by mixing with a fourth-generation heavy lepton. We find that the induced form factors can be as large as 0.5%. The model satisfies all phenomenological bounds in a natural way, including thos e due to the strong limits on the neutron and electron electric dipole moments. Anomalous CP-odd couplings of this size are unlikely to be o bserved at LEP200, but might be detectable at NLC.