Magnetic moment of Dirac neutrinos

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Abstract
The neutrino magnetic moment in the SU(2)L×U(1)Y model, in the N=1 broken supergravity model, and in the SU(2)L×SU(2)R×U(1)B−L left-right model is examined. We find that in all these models the magnetic moment is always directly proportional to the neutrino mass. It is emphasized that although in the left-right model the magnetic moment is proportional to the charged-lepton mass the combination of this mass and the left-right mixing effectively gives a neutrino mass. Given a small value of the neutrino mass its magnetic moment is too small to be of experimental interest.