Kadanoff-Baym approach to flavour mixing and oscillations in resonant leptogenesis

Patama Sri Bhupal Dev, Peter Millington, Apostolos Pilaftsis, Daniele Teresi

Research output: Contribution to journalArticlepeer-review


We describe a loopwise perturbative truncation scheme for quantum transport equations in the Kadanoff–Baym formalism, which does not necessitate the use of the so-called Kadanoff–Baym or quasi-particle ansaetze for dressed propagators. This truncation scheme is used to study flavour effects in the context of Resonant Leptogenesis (RL), showing explicitly that, in the weakly-resonant regime, there exist two distinct and pertinent flavour effects in the heavy-neutrino sector: (i) the resonant mixing and (ii) the oscillations between different heavy-neutrino flavours. Moreover, we illustrate that Kadanoff–Baym and quasi-particle ansaetze, whilst appropriate for the flavour-singlet dressed charged-lepton and Higgs propagators of the RL scenario, should not be applied to the dressed heavy-neutrino propagators. The use of these approximations for the latter is shown to capture only flavour oscillations, whilst discarding the separate phenomenon of flavour mixing.
Original languageEnglish
Pages (from-to)128-158
Number of pages31
JournalNuclear Physics, Section B
Early online date9 Dec 2014
Publication statusPublished - Feb 2015


  • Resonant Leptogenesis
  • Neutrino Physics
  • Thermal Quantum Field Theory


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