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High Energy Physics - Phenomenology

arXiv:2305.06663 (hep-ph)
[Submitted on 11 May 2023]

Title:Parameter space for testable leptogenesis

Authors:Yannis Georis
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Abstract:Extending the Standard Model with right-handed neutrinos provides a minimal explanation for both light neutrino masses (through the type-I seesaw mechanism) and the baryon asymmetry of our universe (through leptogenesis). We map here for the first time the range of heavy neutrino mixing angle consistent with both neutrino masses and leptogenesis in a scenario with 3 generations of right-handed neutrinos with Majorana masses between 50 MeV and 70 TeV. Due to the presence of a third degree of freedom that remains much more feebly coupled to the Standard Model thermal bath, we observe that the parameter space is much larger compared to the minimal scenario with 2 generations. This greatly enhances the testability prospects for low-scale leptogenesis and, in the most optimistic scenario, would allow experimentalists not only to discover right-handed neutrinos but also to perform consistency checks of the model.
Comments: 4 pages, 2 figures, Contribution to the 2023 Electroweak session of the 57th Rencontres de Moriond
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:2305.06663 [hep-ph]
  (or arXiv:2305.06663v1 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.2305.06663

Submission history

From: Yannis Georis [view email]
[v1] Thu, 11 May 2023 08:59:40 UTC (287 KB)
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