2006/01/31 by Atsushi Watanabe, Koichi Yoshioka
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Baryon asymmetry #CP violation #Double beta decay #Leptogenesis #Lepton #MAJORANA #Mass matrix #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quark #Standard Model (mathematical formulation) #Sterile neutrino #Yukawa potential #hep-ph
paper · pdf · doi:10.1088/1126-6708/2006/05/044
published as JHEP 0605 (2006) 044 · 37 pages, 6 figures
arxiv created 2006/03/15 · openalex publication_date 2006/05/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The origin of the observed masses and mixing angles of quarks and leptons is one of imperative subjects in and beyond the standard model. Toward a deeper understanding of flavor structure, we investigate in this paper the minimality of fermion mass (Yukawa) matrices in unified theory. That is, the simplest matrix form is explored in light of the current experimental data for quarks and leptons, including the recent measurements of quark CP violation and neutrino oscillations. Two types of neutrino mass schemes are particularly analyzed; (i) Majorana masses of left-handed neutrinos with unspecified mechanism and (ii) Dirac and Majorana masses introducing three right-handed neutrinos. As a result, new classes of neutrino mass matrices are found to be consistent to the low-energy experimental data and high-energy unification hypothesis. For distinctive phenomenological implications of the minimal fermion mass textures, we discuss flavor-violating decay of charged leptons, the baryon asymmetry of the universe via thermal leptogenesis, neutrino-less double beta decay, and low-energy leptonic CP violation.