2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49351On the basis of see-saw mechanism, possible generation structure is investigated. Assuming that right-handed neutrinos are realistic particles below GUTs mass, it is shown that there is a choice of new scheme of generation,where the combination of leptons and quarks is different from the ordinary one. Our scheme predict a new proton decay mode.9 pagesHigh Energy Physics - Phenomenologytext