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It is shown that gauge theories give contributions to neutrinoless double- decay () ₀ which are not covered by the standard parametrizations. While probably small, their existence raises the question of whether the observation of () ₀ implies the existence of a Majorana mass term for the neutrino. For a "natural" gauge theory we argue that this is indeed the case.
Schechter et al. (Tue,) studied this question.
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