Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-12-12
Ann.Phys.305:119-136,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, LaTeX, v3: references and related comment added
Scientific paper
One of the much-debated novel features of theories with extra dimensions is the presence of power-like loop corrections to gauge coupling unification, which have the potential of allowing a significant reduction of the unification scale. A recognized problem of such scenarios is the UV sensitivity of the above power corrections. We consider situations where the grand unified group is broken by the vacuum expectation value of a bulk field and find that, because of the softness of this extra-dimensional symmetry breaking mechanism, power-like threshold corrections are calculable and generic in many of the most relevant settings. While the precision is limited by the presence of higher-dimension bulk operators, the most dangerous of these operators are naturally forbidden by symmetries of the bulk theory. Particularly interesting and constrained scenarios arise in the context of higher-dimensional supersymmetry. Our phenomenological exploration of SU(5) models in 5d, linked in particular with more recently discussed orbifold GUT models, shows promising results.
Hebecker Arthur
Westphal Alexander
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