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How Magnetic is the Dirac Neutrino?
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We derive model-independent, "naturalness" upper bounds on the magnetic moments \mu_\nu of Dirac neutrinos generated by physics above the scale of electroweak symmetry breaking. In the absence of fine-tuning of effective operator coefficients, we find that current information on neutrino mass implies that |\mu_\nu | < 10^(-14) Bohr magnetons. This bound is several orders of magnitude stronger than those obtained from analyses of solar and reactor neutrino data and astrophysical observations.
Forward citations
Cited by 4 Pith papers
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Decoupling Neutrino Magnetic Moment from Mass with $SU(2)_L$ Invariance
A loop-level neutrino magnetic moment is generated via an SU(2)_L adjoint fermion 'bridge', making the mass diagram vanish by tracelessness of the generators, though RG mixing limits the observable size.
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Challenging Majorana neutrino effects in $B\to K^{(\ast)}\nu\nu$ and $K\to \pi\nu\nu$ decays
Belle-II's B→Kνν excess cannot be explained by dimension-7 lepton-number-violating SMEFT operators without fine-tuning neutrino masses, while a light sterile-neutrino extension can, with testable decay spectra.
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Elastic neutrino-electron scattering perspectives at nuclear reactors
Projections show CLOUD and TAO could improve low-energy weak mixing angle measurements to 8-11% via elastic neutrino-electron scattering, with competitive magnetic moment and NSI limits.
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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.
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