2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39467The Karmen anomaly can be interpreted as being due to a heavy neutrino of mass around 137 MeV produced in $π_{e 2}$ decays. This interpretation is consistent with the present limits on the couplings of such an object.11pages, 4figures, TeXHigh Energy Physics - Phenomenologytext