TL;DR
This paper derives model-independent upper bounds on neutrino magnetic moments based on naturalness arguments, revealing that a magnetic moment detection near current limits would indicate Majorana neutrinos and high-scale new physics.
Contribution
It provides the first model-independent naturalness bounds on neutrino magnetic moments for both Dirac and Majorana types, linking them to the scale of new physics.
Findings
Dirac neutrino magnetic moments are tightly constrained, much below current experimental limits.
Majorana neutrino magnetic moments could be near current experimental sensitivity if new physics is at 1 TeV.
Detection of a neutrino magnetic moment near current bounds would imply neutrinos are Majorana particles.
Abstract
The existence of a neutrino magnetic moment implies contributions to the neutrino mass via radiative corrections. We derive model-independent "naturalness" upper bounds on the magnetic moments of Dirac and Majorana neutrinos, generated by physics above the electroweak scale. For Dirac neutrinos, the bound is several orders of magnitude more stringent than present experimental limits. However, for Majorana neutrinos the magnetic moment bounds are weaker than present experimental limits if is generated by new physics at ~ 1 TeV, and surpass current experimental sensitivity only for new physics scales > 10 -- 100 TeV. The discovery of a neutrino magnetic moment near present limits would thus signify that neutrinos are Majorana particles.
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