2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/181726Large colliders are not sensitive to light neutrino masses and character, but they can produce new heavy neutrinos, allowing also for the determination of their Dirac or Majorana nature. We review the discovery limits at the next generation of large colliders.LaTeX 32 pages. This review summarises and extends work presented at several conferences. To appear in the proceedings of CORFU2005. References addedHigh Energy Physics - Phenomenologytext