2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/190404In models with flat extra dimensions tiny Dirac neutrino masses can be generated via the coupling of four dimensional Standard Model fields to a higher dimensional fermion. Here we argue that, in spite of the Dirac nature of the neutrino, quantization of the electric charge can still be understood as a result of anomaly cancellation, charge conservation and naturalness requirements.9 pages. Several changes: Discusion on RS models removed, Comments addedHigh Energy Physics - Phenomenologytext