Low-Scale Leptogenesis from Resonant Thermal Lepton Flavour Coherences
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arXiv
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| Natura: | Preprint |
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2026
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| _version_ | 1866913013478457344 |
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| author | Li, Shao-Ping Pilaftsis, Apostolos |
| author_facet | Li, Shao-Ping Pilaftsis, Apostolos |
| contents | Resonant heavy-neutrino mixing and sterile neutrino oscillations are two prominent mechanisms to realize low-scale leptogenesis, with singlet neutrino masses below TeV energies that could be probed in current and future laboratory experiments. In their minimal settings, both mechanisms require a significant degree of degeneracy in the singlet neutrino masses to compensate for the suppression that results from the small neutrino Yukawa couplings. After further developing the flavour-covariant Kadanoff-Baym formalism, we study in detail a novel dominant mechanism for low-scale leptogenesis which becomes greatly enhanced by resonant thermal lepton-flavour coherences at the two-loop level. This mechanism works successfully for both Dirac and Majorana singlet neutrinos, and it does not rely on whether these singlet neutrinos are quasi-degenerate or not. In particular, it implies that successful low-scale leptogenesis in the type-I seesaw framework can be naturally realised with heavy neutrino masses that could be as low as GeV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_06493 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Low-Scale Leptogenesis from Resonant Thermal Lepton Flavour Coherences Li, Shao-Ping Pilaftsis, Apostolos High Energy Physics - Phenomenology Resonant heavy-neutrino mixing and sterile neutrino oscillations are two prominent mechanisms to realize low-scale leptogenesis, with singlet neutrino masses below TeV energies that could be probed in current and future laboratory experiments. In their minimal settings, both mechanisms require a significant degree of degeneracy in the singlet neutrino masses to compensate for the suppression that results from the small neutrino Yukawa couplings. After further developing the flavour-covariant Kadanoff-Baym formalism, we study in detail a novel dominant mechanism for low-scale leptogenesis which becomes greatly enhanced by resonant thermal lepton-flavour coherences at the two-loop level. This mechanism works successfully for both Dirac and Majorana singlet neutrinos, and it does not rely on whether these singlet neutrinos are quasi-degenerate or not. In particular, it implies that successful low-scale leptogenesis in the type-I seesaw framework can be naturally realised with heavy neutrino masses that could be as low as GeV. |
| title | Low-Scale Leptogenesis from Resonant Thermal Lepton Flavour Coherences |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.06493 |