A Left-Right Symmetric Unified Theory of Extended Color and Electroweak Interactions
Ikuo S. Sogami · Progress of Theoretical Physics · 1991
A left-right symmetric unified theory of extended color and electroweak interactions is proposed. The gauge group has the structure SU(4)cL ×SU(4)cR ×SU(2)L ×SU(2)R ×U(1)X in which the lepton number is described as the fourth color and the U(1)X group is generated by a new charge X. A universal seesaw mechanism is implemented by including exotic electroweak singlets of fermions and five Higgs multiplets. Colored Higgs quartets work to discriminate leptons from quarks and to make neutrinos being massless at the tree level. Fermion masses are allotted through the universal seesaw mixings and the problem of mass hierarchy is partially resolved.