Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-08-19
Phys.Lett. B519 (2001) 164-168
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, including 2 figures, UT-962
Scientific paper
10.1016/S0370-2693(01)01124-8
We construct supersymmetric (SUSY) grand unification (GUT) models in the six dimensional space-time where the GUT symmetry is broken down to the standard-model gauge group by a simple orbifolding T^2/Z_4 or T^2/Z_6 and a pair of massless Higgs doublets in the SUSY standard model are naturally obtained. Since the background geometry here is simple compared with models using the Scherk-Schwarz mechanism, one might hope for an approximate gauge coupling unification in the present models. Here, the presence of the massless Higgs multiplets in the bulk is quite natural, since the anomaly cancellation in the six dimensional space-time requires N=2 hyper multiplets in the bulk, some of which are origins of the Higgs doublets. However, the origin of the quarks and leptons is still not clear at all.
Watari Taizan
Yanagida Takayuki
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