MeV-scale seesaw and leptogenesis
Abstract We study the type-I seesaw model with three right-handed neutrinos and Majorana masses below the pion mass. In this mass range, the model parameter space is not only strongly constrained by the requirement to explain the light neutrino masses, but also by experimental searches and cosmologi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-01-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP01(2021)200 |
| _version_ | 1818623104653459456 |
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| author | Valerie Domcke Marco Drewes Marco Hufnagel Michele Lucente |
| author_facet | Valerie Domcke Marco Drewes Marco Hufnagel Michele Lucente |
| author_sort | Valerie Domcke |
| collection | DOAJ |
| description | Abstract We study the type-I seesaw model with three right-handed neutrinos and Majorana masses below the pion mass. In this mass range, the model parameter space is not only strongly constrained by the requirement to explain the light neutrino masses, but also by experimental searches and cosmological considerations. In the existing literature, three disjoint regions of potentially viable parameter space have been identified. In one of them, all heavy neutrinos decay shortly before big bang nucleosynthesis. In the other two regions, one of the heavy neutrinos either decays between BBN and the CMB decoupling or is quasi-stable. We show that previously unaccounted constraints from photodisintegration of nuclei practically rule out all relevant decays that happen between BBN and the CMB decoupling. Quite remarkably, if all heavy neutrinos decay before BBN, the baryon asymmetry of the universe can be quite generically explained by low-scale leptogenesis, i.e. without further tuning in addition to what is needed to avoid experimental and cosmological constraints. This motivates searches for heavy neutrinos in pion decay experiments. |
| first_indexed | 2024-12-16T18:35:46Z |
| format | Article |
| id | doaj.art-dd7b2b8646a74b429bd143fe51301ab2 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-16T18:35:46Z |
| publishDate | 2021-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-dd7b2b8646a74b429bd143fe51301ab22022-12-21T22:21:11ZengSpringerOpenJournal of High Energy Physics1029-84792021-01-012021111910.1007/JHEP01(2021)200MeV-scale seesaw and leptogenesisValerie Domcke0Marco Drewes1Marco Hufnagel2Michele Lucente3Theoretical Physics Department, CERNCentre for Cosmology, Particle Physics and Phenomenology, Université catholique de LouvainDeutsches Elektronen Synchrotron (DESY)Centre for Cosmology, Particle Physics and Phenomenology, Université catholique de LouvainAbstract We study the type-I seesaw model with three right-handed neutrinos and Majorana masses below the pion mass. In this mass range, the model parameter space is not only strongly constrained by the requirement to explain the light neutrino masses, but also by experimental searches and cosmological considerations. In the existing literature, three disjoint regions of potentially viable parameter space have been identified. In one of them, all heavy neutrinos decay shortly before big bang nucleosynthesis. In the other two regions, one of the heavy neutrinos either decays between BBN and the CMB decoupling or is quasi-stable. We show that previously unaccounted constraints from photodisintegration of nuclei practically rule out all relevant decays that happen between BBN and the CMB decoupling. Quite remarkably, if all heavy neutrinos decay before BBN, the baryon asymmetry of the universe can be quite generically explained by low-scale leptogenesis, i.e. without further tuning in addition to what is needed to avoid experimental and cosmological constraints. This motivates searches for heavy neutrinos in pion decay experiments.https://doi.org/10.1007/JHEP01(2021)200Beyond Standard ModelCosmology of Theories beyond the SMNeutrino Physics |
| spellingShingle | Valerie Domcke Marco Drewes Marco Hufnagel Michele Lucente MeV-scale seesaw and leptogenesis Journal of High Energy Physics Beyond Standard Model Cosmology of Theories beyond the SM Neutrino Physics |
| title | MeV-scale seesaw and leptogenesis |
| title_full | MeV-scale seesaw and leptogenesis |
| title_fullStr | MeV-scale seesaw and leptogenesis |
| title_full_unstemmed | MeV-scale seesaw and leptogenesis |
| title_short | MeV-scale seesaw and leptogenesis |
| title_sort | mev scale seesaw and leptogenesis |
| topic | Beyond Standard Model Cosmology of Theories beyond the SM Neutrino Physics |
| url | https://doi.org/10.1007/JHEP01(2021)200 |
| work_keys_str_mv | AT valeriedomcke mevscaleseesawandleptogenesis AT marcodrewes mevscaleseesawandleptogenesis AT marcohufnagel mevscaleseesawandleptogenesis AT michelelucente mevscaleseesawandleptogenesis |