2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48436The radiative model, proposed by Zee, is extended from the three neutrino $(ν_{e,μ,τ})$ sector to include a fourth sterile neutrino $ν_s$. The oscillations $ν_e \leftrightarrow ν_s$ (solar), $ν_μ\leftrightarrow ν_τ$ (atmospheric) and $ν_e \leftrightarrow ν_μ$ (LSND) are invoked to explain all oscillation data with the successful relation $(Δm^2)_{atm} \simeq 2[(Δm^2)_{solar} (Δm^2)_{LSND}]^{1/2}$ as an added bonus.Talk given at the XXIX International Conference on High Energy Physics, VancouverHigh Energy Physics - Phenomenologytext