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We investigate the present constraints from MINOS and T2K experiments for theneutrino decay scenario induced by non-diagonal couplings of Majorons toneutrinos. As novelty, on top of the typical invisible decay prescription, weadd the contribution of visible decay, where final products can be observed.This new effect depends on the nature of the neutrino - Majoron coupling, whichcan be of scalar or pseudoscalar type. Using the combination of disappearancedata from MINOS and disappearance and appearance data from T2K, for normalordering, we constrain the decay parameter $\alpha\equiv E\,\Gamma$ for theheaviest neutrino, where $E$ and $\Gamma$ are the neutrino energy and width,respectively. We find that when considering visible decay within appearancedata, one can improve current neutrino long-baseline constraints up to $\alpha<\mathcal{O}(10^{-5})$ eV$^2$, at 90\% C.L., for both kinds of couplings, whichis better by one order of magnitude compared to previous bounds.

Visible neutrino decay in the light of appearance and disappearance long baseline experiments