In a hypothetical scenario where the coupling of the fermions to the gauge fields were extremely small, would it be possible to observe quark and charged leptons oscillate in the same manner as we observe neutrino oscillations today?
i.e. would it be possible for the flavour eigenstate of a quark/lepton produced in a weak interaction to be detected as a different flavour eigenstate at a distant detector due to the states propagating according to their mass eigenstates?
$$ \left| {\nu_{\alpha}(T)} \right> = \sum_iU^*_{\alpha i} \; e^{ip\cdot x} \left| \nu_i \right> $$
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