Lepto-axiogenesis with light right-handed neutrinos
Abstract We study lepto-axiogenesis in theories where the right-handed neutrino is light enough that its dynamics affect the determination of the baryon asymmetry. When compared with theories of high-scale lepto-axiogenesis where the Majorana neutrino mass may be treated as an effective dimension-fi...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-08-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP08(2025)004 |
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| author | Patrick Barnes Raymond T. Co Keisuke Harigaya Aaron Pierce |
| author_facet | Patrick Barnes Raymond T. Co Keisuke Harigaya Aaron Pierce |
| author_sort | Patrick Barnes |
| collection | DOAJ |
| description | Abstract We study lepto-axiogenesis in theories where the right-handed neutrino is light enough that its dynamics affect the determination of the baryon asymmetry. When compared with theories of high-scale lepto-axiogenesis where the Majorana neutrino mass may be treated as an effective dimension-five operator, we find that the predicted saxion mass is lower. Two distinct scenarios emerge. In the first, processes that generate the baryon asymmetry are in equilibrium down to the mass of the right-handed neutrino. In the second, the relevant processes never reach equilibrium; the baryon number freezes in. We comment on implications for supersymmetric spectra and discuss constraints on late decays of supersymmetric relics and from dark radiation. In contrast to high-scale lepto-axiogenesis, which predicts superpartners with masses of 10–100 TeV or more, we find this scenario is consistent with a wider range of superpartner masses, all the way down to current direct search bounds. |
| format | Article |
| id | doaj-art-74a8bfb9cf8b4a18a11e5c3decffbdef |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-74a8bfb9cf8b4a18a11e5c3decffbdef2025-08-20T03:45:40ZengSpringerOpenJournal of High Energy Physics1029-84792025-08-012025814710.1007/JHEP08(2025)004Lepto-axiogenesis with light right-handed neutrinosPatrick Barnes0Raymond T. Co1Keisuke Harigaya2Aaron Pierce3Leinweber Center for Theoretical Physics, Department of Physics, University of MichiganWilliam I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of MinnesotaDepartment of Physics, University of ChicagoLeinweber Center for Theoretical Physics, Department of Physics, University of MichiganAbstract We study lepto-axiogenesis in theories where the right-handed neutrino is light enough that its dynamics affect the determination of the baryon asymmetry. When compared with theories of high-scale lepto-axiogenesis where the Majorana neutrino mass may be treated as an effective dimension-five operator, we find that the predicted saxion mass is lower. Two distinct scenarios emerge. In the first, processes that generate the baryon asymmetry are in equilibrium down to the mass of the right-handed neutrino. In the second, the relevant processes never reach equilibrium; the baryon number freezes in. We comment on implications for supersymmetric spectra and discuss constraints on late decays of supersymmetric relics and from dark radiation. In contrast to high-scale lepto-axiogenesis, which predicts superpartners with masses of 10–100 TeV or more, we find this scenario is consistent with a wider range of superpartner masses, all the way down to current direct search bounds.https://doi.org/10.1007/JHEP08(2025)004Axions and ALPsEarly Universe Particle PhysicsBaryo-and LeptogenesisModels for Dark Matter |
| spellingShingle | Patrick Barnes Raymond T. Co Keisuke Harigaya Aaron Pierce Lepto-axiogenesis with light right-handed neutrinos Journal of High Energy Physics Axions and ALPs Early Universe Particle Physics Baryo-and Leptogenesis Models for Dark Matter |
| title | Lepto-axiogenesis with light right-handed neutrinos |
| title_full | Lepto-axiogenesis with light right-handed neutrinos |
| title_fullStr | Lepto-axiogenesis with light right-handed neutrinos |
| title_full_unstemmed | Lepto-axiogenesis with light right-handed neutrinos |
| title_short | Lepto-axiogenesis with light right-handed neutrinos |
| title_sort | lepto axiogenesis with light right handed neutrinos |
| topic | Axions and ALPs Early Universe Particle Physics Baryo-and Leptogenesis Models for Dark Matter |
| url | https://doi.org/10.1007/JHEP08(2025)004 |
| work_keys_str_mv | AT patrickbarnes leptoaxiogenesiswithlightrighthandedneutrinos AT raymondtco leptoaxiogenesiswithlightrighthandedneutrinos AT keisukeharigaya leptoaxiogenesiswithlightrighthandedneutrinos AT aaronpierce leptoaxiogenesiswithlightrighthandedneutrinos |