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In a series of papers, we pointed out that an anomalous $U(1)_A$ gaugesymmetry naturally solves various problems in grand unified theories (GUTs) andthat a horizontal gauge symmetry, $SU(2)_H$ or $SU(3)_H$, not only realizes theunification of three generation quarks and leptons in fewer multiplets but alsosolves the supersymmetric flavor problem. In this paper, we examine thepossibility that the Higgs sectors of the GUT symmetry and of the horizontalsymmetry are unified, that is, there are some Higgs fields whose vacuumexpectation values (VEVs) break both the GUT gauge symmetry and the horizontalsymmetry at the same time. Although the scale of the VEVs become too large tosuppress the flavor changing neutral current processes sufficiently, theunification is possible. In addition, for the $SU(3)_H$ models, the $SU(3)_H$gauge anomaly is cancelled in the unified models without introducing additionalfields in contrast with the previous models in which the Higgs sectors are notunified.Comment: 35 page

Horizontal symmetry in Higgs sector of GUT withU(1)Asymmetry

Horizontal symmetry in Higgs sector of GUT withU(1)_Asymmetry