Unified weak-electromagnetic interactions and lepton-hadron symmetry — Nine leptons and nine quarks

Weak Interactions of Quarks and Leptons: Experimental Status’

WEAK INTERACTIONS OF QUARKS AND LEPTONS.: EXPERIMENTAL FTbTU_S;

Flavor Symmetry for Quarks and Leptons

Present data on neutrino masses and mixing favor the highly symmetric tribimaximal neutrino mixing matrix which suggests an underlying flavor symmetry. A systematic study of non-abelian finite groups of order g ≤ 31 reveals that tribimaximal mixing can be derived not only from the well known tetrahedral flavor symmetry T ≡ A4, but also by using the binary tetrahedral symmetry SL2(F3) which does...

Quaternion Family Symmetry of Quarks and Leptons

To a first approximation, the quark mixing matrix has θ 13 = θ q 23 = 0, whereas the lepton mixing matrix has θ 23 = π/4. We show how this structure may be understood if the family symmetry is Q8, 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 ...

New Gauge Symmetry of Quarks and Leptons

Instead of anchoring the seesaw mechanism with the conventional heavy righthanded neutrino singlet, a small Majorana neutrino mass may be obtained just as well with the addition of a heavy triplet of leptons per family to the minimal standard model of particle interactions. The resulting model is shown to have the remarkable property of accommodating a new U(1) symmetry which is anomaly-free an...