Lepton asymmetry from mixing and oscillations

Kartavtsev, Alexander, Millington, Peter and Vogel, Hendrik (2016) Lepton asymmetry from mixing and oscillations. Journal of High Energy Physics, 2016 (6). 66/1-66/56. ISSN 1029-8479

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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.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/795706
Keywords: Thermal field theory; Effective field theories
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: https://doi.org/10.1007/JHEP06(2016)066
Depositing User: Millington, Peter
Date Deposited: 02 Nov 2017 13:10
Last Modified: 04 May 2020 17:57
URI: https://eprints.nottingham.ac.uk/id/eprint/47784

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