Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-01-04
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, Revtex4, To appear in the Proceedings of SUSY03, held at the University of Arizona, Tucson, AZ, USA, June 5-10, 2003
Scientific paper
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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