Running and Matching from 5 to 4 Dimensions

Details Running and Matching from 5 to 4 Dimensions Running and Matching from 5 to 4 Dimensions

2001-08-10

arxiv.org/abs/hep-ph/0108102v1

Nucl.Phys. B622 (2002) 227-239

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 3 figures

Scientific paper

10.1016/S0550-3213(01)00602-2

We study 5 dimensional grand-unified theories in an orbifold geometry by the method of effective field theory: we match the low and high energy theories by integrating out at 1-loop the massive Kaluza-Klein states. In the supersymmetric case the radius dependence of threshold effects is fixed by the rescaling anomalies of the low energy theory. We focus on a recently proposed SU(5) model on $M^4 \times S^1/(Z_2\times Z_2^\prime)$. Even though the spectrum of the heavy modes is completely known, there still are corrections to gauge unification originating from boundary couplings. In order to control these effects one has to rely on extra assumptions. We argue that, as far as gauge couplings are concerned, the predictive power of these models is similar to conventional GUTs.

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