It is pointed out that in a general class of gauge models, there exist new contributions to neutrinoless double β 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.
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Mohapatra et al. (1981) studied this question.
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