Abstract
The neutrinoless double-beta [Formula: see text] decay is a lepton-number-violating process which is experimentally unique for identifying the Majorana nature of massive neutrinos. We give a brief overview of some theoretical aspects of this process. In particular, a novel “coupling-rod” diagram is introduced to describe the effective Majorana mass [Formula: see text] in the complex plane. Possible contributions of new physics to [Formula: see text] are also discussed.
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