Weak triplet models permit decoupling of neutrino magnetic moment from mass in minimal realizations but require delicate parameter adjustments for observable effects, and lose the decoupling in extended scenarios.
From transition magnetic moments to majorana neutrino masses
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abstract
It is well known that a majorana mass induces a (small) transition magnetic moment. The converse is also true; in this paper we estimate the loop contribution of transition magnetic moments $[\mu]_{\alpha \beta}$ to the neutrino mass matrix $[m]_{\alpha \beta}$. We show that for hierarchical neutrino masses, the contribution of $[\mu]_{e \tau}$ to $[m]_{e \tau}$ can exceed the experimental value of $[m]_{e \tau}$.
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Weak Triplet Models of Neutrino Magnetic Moments
Weak triplet models permit decoupling of neutrino magnetic moment from mass in minimal realizations but require delicate parameter adjustments for observable effects, and lose the decoupling in extended scenarios.