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Flavor/mass dichotomy} for mixed fields is one of the most controversialissues in Quantum Field Theory. In this work we approach the problem byconsidering mixing of neutrinos and computing the transition amplitude for theparadigmatic neutron $\beta$-decay $n\,\rightarrow\, p \,+\,e^ \,+\,\bar\nu$.Calculations are developed by utilizing the following different representationsof neutrino states: \emph{i}) Pontecorvo states, \emph{ii}) mass states and\emph{iii}) exact QFT flavor states, which are defined as eigenstates of theflavor charge. As a guiding principle, we invoke the conservation of leptoncharge in the interaction vertex, which is fundamentally inbuilt into theStandard Model at tree level. In the short-time limit, we show that the onlyfully consistent scenario is that based on QFT states, whereas the other twoframeworks contradict the underlying theory. This result provides a crucialstep towards understanding the r\^ole of neutrino mixing in weak decays andcontributes to elucidate the flavor/mass controversy in QFT.

On the flavor/mass dichotomy for mixed neutrinos: a phenomenologically motivated analysis based on lepton charge conservation in neutron decay