Ghiglieri, Jacopo; Laine, Mikko Sakari (2019). Precision study of GeV-scale resonant leptogenesis. Journal of High Energy Physics, 2019(2) Springer 10.1007/JHEP02(2019)014
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Ghiglieri-Laine2019_Article_PrecisionStudyOfGeV-scaleReson.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (1MB) | Preview |
Low-scale leptogenesis is most efficient in the limit of an extreme mass degeneracy of right-handed neutrino flavours. Two variants of this situation are of particular interest: large neutrino Yukawa couplings, which boost the prospects of experimental scrutiny, and small ones, which may lead to large lepton asymmetries surviving down to T < 5 GeV. We study benchmarks of these cases within a “complete” framework which tracks both helicity states of right-handed neutrinos as well as their kinetic non-equilibrium, and includes a number of effects not accounted for previously. For two right-handed flavours with GeV-scale masses, Yukawa couplings up to |h| ~0.7×10⁻⁵ are found to be viable for baryo- genesis, with ∆M/M ~10⁻8 as the optimal degeneracy. Late-time lepton asymmetries are most favourably produced with ∆M/M ~10⁻¹¹. We show that the system reaches a stationary state at T < 15 GeV, in which lepton asymmetries can be more than 103 times larger than the baryon asymmetry, reach flavour equilibrium, and balance against helicity asymmetries.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Institute of Theoretical Physics |
UniBE Contributor: |
Ghiglieri, Jacopo, Laine, Mikko Sakari |
Subjects: |
500 Science > 530 Physics |
ISSN: |
1029-8479 |
Publisher: |
Springer |
Language: |
English |
Submitter: |
Esther Fiechter |
Date Deposited: |
14 May 2019 13:18 |
Last Modified: |
05 Dec 2022 15:27 |
Publisher DOI: |
10.1007/JHEP02(2019)014 |
ArXiv ID: |
1811.01971 |
BORIS DOI: |
10.7892/boris.127982 |
URI: |
https://boris.unibe.ch/id/eprint/127982 |
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