Leptogenesis with dynamical couplings
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arXiv
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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866912147431227392 |
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| author | Huang, Peisi Xu, Tao |
| author_facet | Huang, Peisi Xu, Tao |
| contents | We propose a novel leptogenesis mechanism with a temperature-dependent coupling between the right-handed neutrino and Standard Model particles. This coupling experiences suppression at high temperatures and becomes sizable when the lepton asymmetry washout processes are Boltzmann-suppressed. Such a feature ensures that the washout rates remain consistently below the Hubble expansion rate, preserving all lepton asymmetry generated in the decay of right-handed neutrinos. We illustrate the feasibility of this mechanism with two example models and show that the observed baryon asymmetry of the Universe can be successfully obtained for right-handed neutrino masses larger than $10^9~{\rm GeV}$ as well as for smaller violation of charge-parity symmetry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_06380 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Leptogenesis with dynamical couplings Huang, Peisi Xu, Tao High Energy Physics - Phenomenology We propose a novel leptogenesis mechanism with a temperature-dependent coupling between the right-handed neutrino and Standard Model particles. This coupling experiences suppression at high temperatures and becomes sizable when the lepton asymmetry washout processes are Boltzmann-suppressed. Such a feature ensures that the washout rates remain consistently below the Hubble expansion rate, preserving all lepton asymmetry generated in the decay of right-handed neutrinos. We illustrate the feasibility of this mechanism with two example models and show that the observed baryon asymmetry of the Universe can be successfully obtained for right-handed neutrino masses larger than $10^9~{\rm GeV}$ as well as for smaller violation of charge-parity symmetry. |
| title | Leptogenesis with dynamical couplings |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2312.06380 |