Abstract
Abstract
We revisit the possibility of producing the observed baryon asymmetry of the Universe via thermal leptogenesis, where CP violation comes exclusively from the low-energy phases of the neutrino mixing matrix. We demonstrate the viability of thermal flavoured leptogenesis across seven orders of magnitude (106
< T (GeV) < 1013), using modern numerical machinery, where the lower bound can be reached only if flavour effects are taken into account and its value depends on the allowed degree of cancellation between the tree-level and radiative contributions to the light neutrino masses. At very high scales (T ≫1012 GeV), we clarify that thermal leptogenesis is sensitive to the low-energy phases, in contradiction with what is usually claimed in the literature. In particular we demonstrate that Majorana-phase leptogenesis is in general viable while Dirac-phase leptogenesis requires some level of fine-tuning.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Reference116 articles.
1. A.D. Sakharov, Violation of CP Invariance, C asymmetry and baryon asymmetry of the universe, Pisma Zh. Eksp. Teor. Fiz.
5 (1967) 32 [INSPIRE].
2. Super-Kamiokande collaboration, Evidence for oscillation of atmospheric neutrinos, Phys. Rev. Lett.
81 (1998) 1562 [hep-ex/9807003] [INSPIRE].
3. V.A. Kuzmin, V.A. Rubakov and M.E. Shaposhnikov, On the anomalous electroweak baryon number nonconservation in the early universe, Phys. Lett.
B 155 (1985) 36.
4. S.Yu. Khlebnikov and M.E. Shaposhnikov, The statistical theory of anomalous fermion number nonconservation, Nucl. Phys.
B 308 (1988) 885 [INSPIRE].
5. P. Minkowski, μ → eγ at a rate of one out of 109
muon decays?, Phys. Lett.
67B (1977) 421 [INSPIRE].
Cited by
39 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献