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Author  |
King, S.F.; Leontaris, G.K.; Marsili, L.; Zhou, Y.L. |
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Title |
Leptogenesis in realistic flipped SU(5) |
Type |
Journal Article |
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Year |
2024 |
Publication |
Journal of High Energy Physics |
Abbreviated Journal |
J. High Energy Phys. |
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Volume |
12 |
Issue |
12 |
Pages |
211 - 18pp |
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Keywords |
Baryo-and Leptogenesis; Grand Unification; Neutrino Mixing |
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Abstract |
We study thermal leptogenesis in realistic supersymmetric flipped SU(5) x 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 N1 and N2 have nearby masses of order 109 GeV, with thermal leptogenesis arising non-resonantly from both N1 and N2. 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. |
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Address |
[King, Stephen F.] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, England, Email: king@soton.ac.uk; |
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Publisher |
Springer |
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Language |
English |
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Original Title |
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Series Volume |
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ISSN |
1029-8479 |
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Notes |
WOS:001462069100018 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6606 |
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