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

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Neutrinoless double-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>decay in SU(2)×U(1) theories

Neutrinoless double-βdecay in SU(2)×U(1) theories