title: 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 4pi (nu2)/square root3 m(nu), where nu approximately 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.
authors.affiliation: Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors.forename: F
authors.initials: F
authors.lastname: Maltoni
authors.forename: J M
authors.initials: JM
authors.lastname: Niczyporuk
authors.forename: S
authors.initials: S
authors.lastname: Willenbrock