General formulas are given for the decay rate ₂₁+ in the SU (2) (1) model for neutrinos with a small mass. The emphasis is on distinguishing between the cases of Dirac and Majorana neutrinos. Possible enhancements of the rate due to methods of eluding the Glashow-Iliopoulos-Maiani suppression and due to charged Higgs bosons are considered.
Pal et al. (Mon,) studied this question.