Leptogenesis without on-shell right-handed neutrinos
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866914594178465792 |
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| author | Cléry, Simon Ibarra, Alejandro Yonar, Onur |
| author_facet | Cléry, Simon Ibarra, Alejandro Yonar, Onur |
| contents | We propose a novel mechanism for generating the baryon asymmetry of the Universe through leptogenesis in a scenario where the right-handed neutrinos are heavier than the maximal temperature of the Universe, and are never produced on-shell neither by thermal nor by non-thermal mechanisms. We introduce a new scalar field, $ϕ$, lighter than the right-handed neutrinos, that couples to the latter via a Yukawa coupling, so that it decays into two lepton doublets and two higgs doublets via off-shell right-handed neutrinos. Then, we derive the CP asymmetry arising from the interference between tree-level and loop diagrams in the four-body decay, and we show that the generated baryon asymmetry can reproduce the observed value both in a scenario where $ϕ$ is responsible for the reheating of the Universe, and in a scenario where $ϕ$ is a generic scalar that remains in thermal equilibrium with the plasma. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_24163 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Leptogenesis without on-shell right-handed neutrinos Cléry, Simon Ibarra, Alejandro Yonar, Onur High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We propose a novel mechanism for generating the baryon asymmetry of the Universe through leptogenesis in a scenario where the right-handed neutrinos are heavier than the maximal temperature of the Universe, and are never produced on-shell neither by thermal nor by non-thermal mechanisms. We introduce a new scalar field, $ϕ$, lighter than the right-handed neutrinos, that couples to the latter via a Yukawa coupling, so that it decays into two lepton doublets and two higgs doublets via off-shell right-handed neutrinos. Then, we derive the CP asymmetry arising from the interference between tree-level and loop diagrams in the four-body decay, and we show that the generated baryon asymmetry can reproduce the observed value both in a scenario where $ϕ$ is responsible for the reheating of the Universe, and in a scenario where $ϕ$ is a generic scalar that remains in thermal equilibrium with the plasma. |
| title | Leptogenesis without on-shell right-handed neutrinos |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2605.24163 |