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We describe a loopwise perturbative truncation scheme for quantum transportequations in the Kadanoff-Baym formalism, which does not necessitate the use ofthe so-called Kadanoff-Baym or quasi-particle ansaetze for dressed propagators.This truncation scheme is used to study flavour effects in the context ofResonant Leptogenesis (RL), showing explicitly that, in the weakly-resonantregime, there exist two distinct and pertinent flavour effects in theheavy-neutrino sector: (i) the resonant mixing and (ii) the oscillationsbetween different heavy-neutrino flavours. Moreover, we illustrate thatKadanoff-Baym and quasi-particle ansaetze, whilst appropriate for theflavour-singlet dressed charged-lepton and Higgs propagators of the RLscenario, should not be applied to the dressed heavy-neutrino propagators. Theuse of these approximations for the latter is shown to capture only flavouroscillations, whilst discarding the separate phenomenon of flavour mixing.

Kadanoff-Baym Approach to Flavour Mixing and Oscillations in Resonant Leptogenesis