Lepton asymmetry from mixing and oscillations
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 s...
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| Format: | Article |
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Springer
2016
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| Online Access: | https://eprints.nottingham.ac.uk/47784/ |
| _version_ | 1848797628590981120 |
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| author | Kartavtsev, Alexander Millington, Peter Vogel, Hendrik |
| author_facet | Kartavtsev, Alexander Millington, Peter Vogel, Hendrik |
| author_sort | Kartavtsev, Alexander |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T20:06:54Z |
| format | Article |
| id | nottingham-47784 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T20:06:54Z |
| publishDate | 2016 |
| publisher | Springer |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-477842020-05-04T17:57:04Z https://eprints.nottingham.ac.uk/47784/ Lepton asymmetry from mixing and oscillations Kartavtsev, Alexander Millington, Peter Vogel, Hendrik 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. Springer 2016-06-10 Article PeerReviewed 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 Thermal field theory; Effective field theories https://link.springer.com/article/10.1007%2FJHEP06%282016%29066 doi:10.1007/JHEP06(2016)066 doi:10.1007/JHEP06(2016)066 |
| spellingShingle | Thermal field theory; Effective field theories Kartavtsev, Alexander Millington, Peter Vogel, Hendrik Lepton asymmetry from mixing and oscillations |
| title | Lepton asymmetry from mixing and oscillations |
| title_full | Lepton asymmetry from mixing and oscillations |
| title_fullStr | Lepton asymmetry from mixing and oscillations |
| title_full_unstemmed | Lepton asymmetry from mixing and oscillations |
| title_short | Lepton asymmetry from mixing and oscillations |
| title_sort | lepton asymmetry from mixing and oscillations |
| topic | Thermal field theory; Effective field theories |
| url | https://eprints.nottingham.ac.uk/47784/ https://eprints.nottingham.ac.uk/47784/ https://eprints.nottingham.ac.uk/47784/ |