In the framework of the recently proposed electroweak theory on a Planck lattice, we are able to solve approximately the lattice Dyson equation for the fermion self-energy functions and show that the large difference of charged lepton and neutrino masses is caused by their very different gauge couplings. The predicted mass ratio ($10^{ -5}\sim 10^{ -6}$) between neutrinos and charged lepton is compatible with present experiments.
Categories: hep-lat hep-ph