2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48609The characteristic scale of neutral current, provided by an extension of Standard Model with a local group over the right-handed fermions, determines the smallness of neutrino masses of Dirac kind. The experimental observation of neutrino oscillations imposes the stringent limit on the $Z^\prime$ physics appearance at low energies.10 pages, eps-figureHigh Energy Physics - Phenomenologytext