A comment on lepton mixing

Since right-handed neutrinos, if added to the Standard Model, have no gauge inter-actions, their kinetic terms can be mixed. I examine the related rotations of the gauge eigenstates in order to derive the propagators for the kinetic and mass terms, and I comment on the resulting lepton mixing, on the possibility of not having well-defined mass eigenstates, and on the modifica-tions to weak contributions and observables (anomalous magnetic moment, muon decay, neutrino oscillations).Copyright (c) 2022 The author(s)