2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49658We have investigated the possibility of discerning mass from flavor changing neutrino interactions induced $ν_μ\to ν_τ$ oscillations in the long baseline neutrino experiments K2K and MINOS. We have found that for virtually any value of the flavor conserving parameter $ε^\prime$ it will be possible to, independently, distinguish these two mechanisms at K2K, if the flavor changing parameter $ε$ is in the range $ε\gsim 0.77$, and at MINOS, if $ε\gsim 0.2$. Moreover, if K2K measures a depletion of the expected $ν_μ$ flux then MINOS will either observe or discard completely flavor changing neutrino oscillations.21 pages with 7 figures, uses Elsart style and epsfigHigh Energy Physics - Phenomenologytext