Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-03-31
Nucl.Phys.B804:70-89,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 9 figures, to be published in Nuclear Physics, Section B
Scientific paper
10.1016/j.nuclphysb.2008.06.012
Higher-dimensional theories provide a promising framework for unified extensions of the supersymmetric standard model. Compactifications to four dimensions often lead to U(1) symmetries beyond the standard model gauge group, whose breaking scale is classically undetermined. Without supersymmetry breaking, this is also the case for the size of the compact dimensions. Fayet-Iliopoulos terms generically fix the scale M of gauge symmetry breaking. The interplay with supersymmetry breaking can then stabilize the compact dimensions at a size 1/M, much smaller than the inverse supersymmetry breaking scale 1/mu. We illustrate this mechanism with an SO(10) model in six dimensions, compactified on an orbifold.
Buchmüller Wilfried
Catena Riccardo
Schmidt-Hoberg Kai
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