Testing Flavor Changing Neutrino Interactions in Long Baseline Experiments

We have investigated the possibility of discerning mass from flavor changing neutrino interactions induced ${\nu }_{\mu }\to {\nu }_{\tau }$ oscillations in the long baseline neutrino experiments K2K and MINOS. We have found that for virtually any value of the flavor conserving parameter ${ϵ}^{\mathrm{\prime }}$ it will be possible to, independently, distinguish these two mechanisms at K2K, if the flavor changing parameter $ϵ$ is in the range $ϵ\text{gsim}0.77$, and at MINOS, if $ϵ\text{gsim}0.2$. Moreover, if K2K measures a depletion of the expected ${\nu }_{\mu }$ flux then MINOS will either observe or discard completely flavor changing neutrino oscillations.