2015/05/19 by Jue Zhang, Shun Zhou, Zhang, Jue +1
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Baryon asymmetry #CP violation #Double beta decay #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Leptogenesis #Lepton #MAJORANA #Mass matrix #Mixing (physics) #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum mechanics #Seesaw mechanism #Sterile neutrino #hep-ph
paper · pdf · doi:10.48550/arxiv.1505.04858
24 pages, 4 figures, 2 tables, more discussions added, to appear in JHEP
openalex publication_date 2015/05/19 · arxiv created 2015/08/31 · arxiv updated 2015/09/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
In light of the latest neutrino oscillation data, we revisit the minimal scenario of type-I seesaw model, in which only two heavy right-handed Majorana neutrinos are introduced to account for both tiny neutrino masses and the baryon number asymmetry in our Universe. In this framework, we carry out a systematic study of the Frampton-Glashow-Yanagida ansatz by taking into account the renormalization-group running of neutrino mixing parameters and the flavor effects in leptogenesis. We demonstrate that the normal neutrino mass ordering is disfavored even in the minimal supersymmetric standard model with a large value of tan β, for which the running effects could be significant. Furthermore, it is pointed out that the original scenario with a hierarchical mass spectrum of heavy Majorana neutrinos contradicts with the upper bound derived from a naturalness criterion, and the resonant mechanism with nearly-degenerate heavy Majorana neutrinos can be a possible way out.