2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/98150Using the computer code CompHEP we estimate the number of events and the background, at LEP II and TESLA, for the reaction $e^+ e^- \to N\bar{N}γ$, where $N$ is a hypothetical Dirac neutrino with mass of the order of 50 GeV.Standard LaTeX, 9 pages, 2 tables, 3 figuresHigh Energy Physics - Phenomenologytext