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In the context of quantum field theory (QFT), we compute the amplitudes ofweak interaction processes such as $ W^{+} \rightarrow e^{+} + \nu_{e}$ and $W^{+} \rightarrow e^{+} + \nu_{\mu}$ by using different representations offlavor states for mixed neutrinos. Analyzing the short time limit of the aboveamplitudes, we find that the neutrino states defined in QFT as eigenstates ofthe flavor charges lead to results consistent with lepton charge conservation.On the contrary, the Pontecorvo flavor states produce a violation of leptoncharge in the vertex, which is in contrast with what expected at tree level inthe Standard Model.Comment: 15 page

ON FLAVOR CONSERVATION IN WEAK INTERACTION DECAYS INVOLVING MIXED NEUTRINOS