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Lepton asymmetry from mixing and oscillations

Kartavtsev, Alexander; Millington, Peter; Vogel, Hendrik


Alexander Kartavtsev

Peter Millington

Hendrik Vogel


We show how the two physically-distinct sources of CP-asymmetry relevant to scenarios of leptogenesis: (i) resonant mixing and (ii) oscillations between different flavours can be unambiguously identified within the Kadanoff-Baym formalism. These contributions are isolated by analyzing the spectral structure of the non-equilibrium propagators without relying on the definition of particle number densities. The mixing source is associated with the usual mass shells, whereas the oscillation source is identified with a third intermediate shell. In addition, we identify terms lying on the oscillation shell that can be interpreted as the destructive interference between mixing and oscillation. We confirm that identical shell structure is obtained in both the Heisenberg- and interaction-picture realizations of the Kadanoff-Baym formalism. In so doing, we illustrate the self-consistency and complementarity of these two approaches. The interaction-picture approach in particular has the advantage that it may be used to analyze all forms of mass spectra from quasi-degenerate through to hierarchical.


Kartavtsev, A., Millington, P., & Vogel, H. (2016). Lepton asymmetry from mixing and oscillations. Journal of High Energy Physics, 2016(6), Article 66.

Journal Article Type Article
Acceptance Date Apr 11, 2016
Online Publication Date Jun 10, 2016
Publication Date Jun 10, 2016
Deposit Date Nov 2, 2017
Publicly Available Date Nov 2, 2017
Journal Journal of High Energy Physics
Electronic ISSN 1029-8479
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 2016
Issue 6
Article Number 66
Keywords Thermal field theory; Effective field theories
Public URL
Publisher URL


Lepton 10.1007_JHEP06(2016)066.pdf (1.5 Mb)

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