Key points are not available for this paper at this time.
It is pointed out that in a general class of gauge models, there exist new contributions to neutrinoless double transitions, that do not involve a Majorana neutrino but the decay of a doubly charged Higgs boson to electrons. Explicit calculations for the case ^48Ca^48Ti indicate that for reasonable choice of parameters, this new contribution may dominate over that involving light or heavy Majorana neutrinos.
Mohapatra et al. (Mon,) studied this question.