Leptogenesis in realistic flipped SU(5)

被引：0

作者：

King, Stephen F. ^{[1
]}

Leontaris, George K. ^{[2
]}

Marsili, Luca ^{[3
]}

Zhou, Ye-Ling ^{[4
]}

机构：

[1] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, England

[2] Univ Ioannina, Phys Dept, Ioannina 45110, Greece

[3] Univ Valencia, Inst Fis Corpuscular IF, Parc Cientif UV, C Catedrat Jose Beltran 2, E-46980 Paterna, Spain

[4] UCAS, Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, Hangzhou 310024, Peoples R China

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2024年 / 12期

基金：

欧盟地平线“2020”; 中国国家自然科学基金;

关键词：

Baryo-and Leptogenesis; Grand Unification; Neutrino Mixing;

D O I：

10.1007/JHEP12(2024)211

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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.

引用

页数：18

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