Leptogenesis in realistic flipped SU(5)
Abstract We study thermal leptogenesis in realistic supersymmetric flipped SU(5) × U(1) unification. As up-type quarks and neutrinos are arranged in the same multiplets, they exhibit strong correlations, and it is commonly believed that the masses of right-handed (RH) neutrinos are too hierarchical...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-12-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP12(2024)211 |
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| author | Stephen F. King George K. Leontaris Luca Marsili Ye-Ling Zhou |
| author_facet | Stephen F. King George K. Leontaris Luca Marsili Ye-Ling Zhou |
| author_sort | Stephen F. King |
| collection | DOAJ |
| description | Abstract We study thermal leptogenesis in realistic supersymmetric flipped SU(5) × U(1) unification. As up-type quarks and neutrinos are arranged in the same multiplets, they exhibit strong correlations, and it is commonly believed that the masses of right-handed (RH) neutrinos are too hierarchical to fit the low-energy neutrino data. This pattern generally predicts a lightest RH neutrino too light to yield successful leptogenesis, with any lepton-antilepton asymmetry generated from heavier neutrinos being washed out unless special flavour structures are assumed. We propose a different scenario in which the lightest two RH neutrinos N 1 and N 2 have nearby masses of order 109 GeV, with thermal leptogenesis arising non-resonantly from both N 1 and N 2. We show that this pattern is consistent with all data on fermion masses and mixing and predicts the lightest physical left-handed neutrino mass to be smaller than about 10−7 eV. The Dirac phase, which does not take the maximal CP-violating value, plays an important role in leptogenesis. |
| format | Article |
| id | doaj-art-27214124c61c48c7a80c9f705b472151 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-27214124c61c48c7a80c9f705b4721512025-01-05T12:05:50ZengSpringerOpenJournal of High Energy Physics1029-84792024-12-0120241211810.1007/JHEP12(2024)211Leptogenesis in realistic flipped SU(5)Stephen F. King0George K. Leontaris1Luca Marsili2Ye-Ling Zhou3School of Physics and Astronomy, University of SouthamptonPhysics Department, University of IoanninaInstituto de Fìsica Corpuscular (IFIC), Universitat de ValènciaSchool of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCASAbstract We study thermal leptogenesis in realistic supersymmetric flipped SU(5) × U(1) unification. As up-type quarks and neutrinos are arranged in the same multiplets, they exhibit strong correlations, and it is commonly believed that the masses of right-handed (RH) neutrinos are too hierarchical to fit the low-energy neutrino data. This pattern generally predicts a lightest RH neutrino too light to yield successful leptogenesis, with any lepton-antilepton asymmetry generated from heavier neutrinos being washed out unless special flavour structures are assumed. We propose a different scenario in which the lightest two RH neutrinos N 1 and N 2 have nearby masses of order 109 GeV, with thermal leptogenesis arising non-resonantly from both N 1 and N 2. We show that this pattern is consistent with all data on fermion masses and mixing and predicts the lightest physical left-handed neutrino mass to be smaller than about 10−7 eV. The Dirac phase, which does not take the maximal CP-violating value, plays an important role in leptogenesis.https://doi.org/10.1007/JHEP12(2024)211Baryo-and LeptogenesisGrand UnificationNeutrino Mixing |
| spellingShingle | Stephen F. King George K. Leontaris Luca Marsili Ye-Ling Zhou Leptogenesis in realistic flipped SU(5) Journal of High Energy Physics Baryo-and Leptogenesis Grand Unification Neutrino Mixing |
| title | Leptogenesis in realistic flipped SU(5) |
| title_full | Leptogenesis in realistic flipped SU(5) |
| title_fullStr | Leptogenesis in realistic flipped SU(5) |
| title_full_unstemmed | Leptogenesis in realistic flipped SU(5) |
| title_short | Leptogenesis in realistic flipped SU(5) |
| title_sort | leptogenesis in realistic flipped su 5 |
| topic | Baryo-and Leptogenesis Grand Unification Neutrino Mixing |
| url | https://doi.org/10.1007/JHEP12(2024)211 |
| work_keys_str_mv | AT stephenfking leptogenesisinrealisticflippedsu5 AT georgekleontaris leptogenesisinrealisticflippedsu5 AT lucamarsili leptogenesisinrealisticflippedsu5 AT yelingzhou leptogenesisinrealisticflippedsu5 |