High Energy Physics - Phenomenology
[Submitted on 4 Jan 2004
]
Title: Gauge Unification and Flavor Hierarchy from Extra Dimensions
Title: 规范统一与额外维中的味层次结构
Abstract: Extra dimension provides an attractive way to break symmetry by boundary conditions which can be useful to construct a natural grand unified theory avoiding the doublet-triplet splitting problem and the proton decay problem. It can provide also an elegant mechanism to generate hierarchical 4-dimensional Yukawa couplings, involving the quasi-localization of matter fields in extra dimension. We discuss the Kaluza-Klein threshold corrections to low energy gauge couplings in generic 5-dimensional orbifold grand unified theories with quasi-localized matter fields, and apply the results to some class of SU(5) models on $S^1/Z_2\times Z_2$.
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