Flavor Hierarchy from Extra Dimension and Gauge Threshold Correction

Details Flavor Hierarchy from Extra Dimension and Gauge Threshold Correction Flavor Hierarchy from Extra Dimension and Gauge Threshold Correction

2003-07-30

arxiv.org/abs/hep-ph/0307365v2

Nucl.Phys. B687 (2004) 101-123

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 2 eps figures, revtex4. References updated

Scientific paper

10.1016/j.nuclphysb.2004.03.018

Dynamical quasi-localization of matter fields in extra dimension is an elegant mechanism to generate hierarchical 4-dimensional Yukawa couplings. We point out that a bulk matter field whose zero mode is quasi-localized can give a large Kaluza-Klein threshold correction to low energy gauge couplings, which is generically of the order of ln (Yukawa)/8pi^2, so it can significantly affect gauge coupling unification. We compute such threshold corrections in generic 5-dimensional theories compactified on S^1/Z_2 X Z_2, and apply the result to grand unified theories on orbifold generating small Yukawa couplings through quasi-localization.

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