Upper bound on the scale of Majorana-neutrino mass generation

Abstract

We derive a model-independent upper bound on the scale of Majorana-neutrino mass generation. The upper bound is $4\pi v^2/\sqrt{3}{m}_{\nu }$, where $v\simeq 246$ GeV is the weak scale and $m_{\nu }$ is the Majorana neutrino mass. For neutrino masses implied by neutrino oscillation experiments, all but one of these bounds are less than the Planck scale, and they are all within a few orders of magnitude of the grand-unification scale.

3 pages, 1 figure, LaTeX. Talk presented at DPF 2000, Ohio State Univ., Columbus, OH, Aug. 9-12, 2000

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