Radiatively Induced Neutrino Masses and Large Higgs-Neutrino Couplings in the Standard Model with Majorana Fields

The Higgs sector of the Standard Model (SM) with one right-handed neutrino per family is systematically analyzed. In a model with intergenerational independent mixings between families, we can account for very light neutrinos acquiring Majorana masses radiatively at the first electroweak loop level. We also find that in such a scenario the Higgs coupling to the light–heavy neutrinos and to the heavy–heavy ones may be remarkably enhanced with significant implications for the production of these heavy neutrinos at high energy colliders. Published in Z. Phys. C55 (1992) 275–282