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To help develop a picture of Majorana neutrinos, we study their electromagnetic properties. We show that CPT invariance forbids a Majorana neutrino from having a magnetic or electric dipole moment. Then, by considering the process, we find the most general expression for the matrix element of the electromagnetic current of a Majorana neutrino. The result is verified in a way which leads us to explore the behavior under parity of such a particle. Next, we see how electromagnetic properties which follow from one-loop diagrams conform to our general results. Finally, we show how the striking electromagnetic differences between Majorana and Dirac neutrinos can become invisible as the neutrino mass goes to zero.
Boris Kayser (Fri,) studied this question.