SCALE OF MASS GENERATION FOR MAJORANA NEUTRINOS
Abstract
Scales of mass generation for Majorana neutrinos (as well as quarks and leptons) can be probed from high energy 2 → n inelastic scattering involving a multiple longitudinal gauge boson final state. We demonstrate that the unitarity of 2 → n scattering puts the strongest new upper limit on the scale of fermion mass generation, independent of the electroweak symmetry breaking scale 
. Strikingly, for Majorana neutrinos (quarks and leptons), we find that the strongest 2 → n limits fall in a narrow range, 136 - 170 TeV (3 - 107 TeV) with n = 20 - 24 (n = 2 - 12), depending on the observed fermion masses. Physical implications are discussed.
Talk presented by H. J. H. at the Conference of the Division of Particles and Fields, American Physical Society (DPF-2004), held at University of California, Riverside, CA, USA, August 26-31, 2004.
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