How Magnetic is the Dirac Neutrino?

Abstract

We derive model-independent, "naturalness" upper bounds on the magnetic moments μ_νof 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 |μ_ν| < 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.

4 pages, 3 figures, Majorana case discussion corrected. References updated; replaced to match published version

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