Second leptogenesis: Unraveling the baryon-lepton asymmetry discrepancy
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866929241590857728 |
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| author | ChoeJo, YeolLin Enomoto, Kazuki Kim, Yechan Lee, Hye-Sung |
| author_facet | ChoeJo, YeolLin Enomoto, Kazuki Kim, Yechan Lee, Hye-Sung |
| contents | We propose a novel scenario to explain the matter-antimatter asymmetry by twofold leptogenesis, wherein heavy Majorana neutrinos exhibit temperature-dependent masses and engage in $CP$-violating decays. This scenario envisages two distinct phases of leptogenesis: one occurring above the electroweak scale and the other below it. The sphaleron process converts the first lepton asymmetry to baryon asymmetry, but not the second one due to its decoupling. This mechanism potentially explains the significant discrepancy between baryon and lepton asymmetries, as suggested by recent observations of Helium-4. Furthermore, our model implies that the present masses of Majorana neutrinos are lighter than the electroweak scale, offering a tangible avenue for experimental verification in various terrestrial settings. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_16672 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Second leptogenesis: Unraveling the baryon-lepton asymmetry discrepancy ChoeJo, YeolLin Enomoto, Kazuki Kim, Yechan Lee, Hye-Sung High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We propose a novel scenario to explain the matter-antimatter asymmetry by twofold leptogenesis, wherein heavy Majorana neutrinos exhibit temperature-dependent masses and engage in $CP$-violating decays. This scenario envisages two distinct phases of leptogenesis: one occurring above the electroweak scale and the other below it. The sphaleron process converts the first lepton asymmetry to baryon asymmetry, but not the second one due to its decoupling. This mechanism potentially explains the significant discrepancy between baryon and lepton asymmetries, as suggested by recent observations of Helium-4. Furthermore, our model implies that the present masses of Majorana neutrinos are lighter than the electroweak scale, offering a tangible avenue for experimental verification in various terrestrial settings. |
| title | Second leptogenesis: Unraveling the baryon-lepton asymmetry discrepancy |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2311.16672 |