Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-09-15
Phys.Rev. D71 (2005) 011901
Physics
High Energy Physics
High Energy Physics - Phenomenology
latex, 10 pages, 2 eps figures, notations revised, classification of $D_4$ models corrected
Scientific paper
10.1103/PhysRevD.71.011901
To a first approximation, the quark mixing matrix has $\theta^q_{13} = \theta^q_{23} = 0$, whereas the lepton mixing matrix has $\theta^l_{23} = \pi/4$. We show how this structure may be understood if the family symmetry is $Q_8$, the quaternion group of eight elements. We find three viable scenarios for the Majorana neutrino mass matrix, each depending on 4 parameters and predicting a specific mass spectrum. The phenomenology of the two Higgs doublets which generate the Yukawa sector is analyzed and testable predictions are derived. We discuss also the closely related model based on $D_4$, the symmetry group of the square.
Frigerio Michele
Kaneko Satoru
Ma Ernest
Tanimoto Morimitsu
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