2005/12/22 by Alexei Yu. Smirnov
Mathematics · Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Electron #Fermion #Grand Unified Theory #Homogeneous space #Lepton #Mathematics #Mixing (physics) #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Quark #Sterile neutrino #Symmetry (geometry) #Universality (dynamical systems) #hep-ph
paper · pdf · doi:10.1088/1742-6596/39/1/059
published as J.Phys.Conf.Ser. 39 (2006) 232-242 · 11 pages, latex, iopams.sty, 3 figures. Invited talk given at TAUP2005, September 10 - 14, 2005, Zaragoza, Spain
arxiv created 2005/12/22 · openalex publication_date 2006/05/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Status of determination of the neutrino masses and mixing is formulated and possible uncertainties especially due to presence of the sterile neutrinos are discussed. The data hint an existence of special ''neutrino'' symmetries. If not accidental these symmetries have profound implications and can substantially change the unification program. The key issue on the way to the underlying physics is relations between quarks and leptons. The approximate quark-lepton symmetry or universality can be reconciled with strongly different patterns of masses and mixings due to nearly singular character of the mass matrices or screening of the Dirac structures in the double see-saw mechanism.