ar X iv : h ep - p h / 01 08 19 6 v 1 2 3 A ug 2 00 1 Flat directions , doublet - triplet splitting , the monopole problem , and all that

ar X iv : h ep - p h / 01 08 19 6 v 2 1 6 N ov 2 00 1 Flat directions , doublet - triplet splitting , the monopole problem , and all that

We discuss a supersymmetric SU(6) grand unified theory with the GUT flat direction being lifted by soft supersymmetry breaking, and the doublettriplet splitting being achieved with Higgs as a pseudo-Goldstone boson. The theory offers a simple solution to the false vacuum and monopole problems.

ar X iv : h ep - p h / 01 08 10 6 v 1 1 2 A ug 2 00 1 W 10 A POSSIBLE RESOLUTION OF THE e + e − → N̄N PUZZLE ∗

ar X iv : h ep - e x / 04 08 01 4 v 1 6 A ug 2 00 4 Plans for Kaon Physics at BNL

ar X iv : h ep - p h / 01 07 19 0 v 3 2 5 Ju l 2 00 1 1 Fermion Mass Hierarchy in the Grand Unified Theory on S

We suggest a simple grand unified theory where the fifth dimensional coordinate is compactified on an S1/(Z2 × Z ′ 2) orbifold. This model is based on the supersymmetric flipped SU(5) × U(1) grand unified theory, which can realize not only the triplet-doublet splitting but also the natural fermion mass hierarchies. The triplet-doublet splitting is realized by S1/(Z2 × Z ′ 2) orbifolding, which ...

ar X iv : h ep - p h / 01 07 19 0 v 2 1 9 Ju l 2 00 1 1 Fermion Mass Hierarchy in the Grand Unified Theory on S

We suggest a simple grand unified theory where the fifth dimensional coordinate is compactified on an S1/(Z2 × Z ′ 2) orbifold. This model is based on the supersymmetric flipped SU(5) × U(1) grand unified theory, which can realize not only the triplet-doublet splitting but also the natural fermion mass hierarchies. The triplet-doublet splitting is realized by S1/(Z2 × Z ′ 2) orbifolding, which ...