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This question already has an answer here:

The wikipedia page is not so enlightening

Apparantly the Neutrino, if it is a Dirac particle, has a Toroidal Moment. Does this mean the Dirac neutrino would interact electromagnetically as well as weakly?

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marked as duplicate by G. Smith, Jon Custer, Kyle Kanos, stafusa, user191954 Mar 9 at 14:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Yes. Although neutrinos have no charge and therefore don’t interact directly with an electromagnetic field, in principle they do so indirectly through electrons and W bosons. See the relevant one-loop Feynman diagrams here:

https://arxiv.org/pdf/hep-ph/0206083.pdf

As far as I am aware, this electromagnetic interaction is too small to be measured.

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  • $\begingroup$ Does the toroidal moment derive from these e W loop interactions? Or is it different? $\endgroup$ – Craig Mar 2 at 23:49
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    $\begingroup$ According to the paper, these e-W loop interactions cause the neutrino to have a toroidal moment. $\endgroup$ – G. Smith Mar 3 at 2:43

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