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  • Regular Article - Theoretical Physics
  • Open Access
  • Published: 10 June 2016

Lepton asymmetry from mixing and oscillations

  • A. Kartavtsev1,
  • P. Millington2,3 &
  • H. Vogel1 

Journal of High Energy Physics volume 2016, Article number: 66 (2016) Cite this article

  • 290 Accesses

  • 25 Citations

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A preprint version of the article is available at arXiv.

Abstract

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.

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  1. Max-Planck-Institut für Physik, Föhringer Ring 6, 80805, München, Germany

    A. Kartavtsev & H. Vogel

  2. Physik Department T70, Technische Universität München, James-Franck-Straße, 85748, Garching, Germany

    P. Millington

  3. School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom

    P. Millington

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  1. A. Kartavtsev
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ArXiv ePrint: 1601.03086

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Kartavtsev, A., Millington, P. & Vogel, H. Lepton asymmetry from mixing and oscillations. J. High Energ. Phys. 2016, 66 (2016). https://doi.org/10.1007/JHEP06(2016)066

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  • Received: 14 January 2016

  • Revised: 29 March 2016

  • Accepted: 11 April 2016

  • Published: 10 June 2016

  • DOI: https://doi.org/10.1007/JHEP06(2016)066

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Keywords

  • Thermal Field Theory
  • Effective field theories
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