Abstract
We explore the phenomenological predictions of a supersymmetric standard model, with a large extra dimension and unifying gauge couplings. The modified five dimensional renormalisation group equations make it possible to obtain light, maximally mixed stops, with a low scale of supersymmetry breaking and a low unification scale. This allows the fine-tuning to be lowered right down to the barrier coming directly from experimental lower limits on the stop masses. We also show that modifying the SUSY breaking pattern to obtain lighter stops at the high scale does not result in fine-tuning relaxation, and only RGE effects turn out to be effective in generating a lower fine-tuning.
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Lalak, Z., Lewicki, M., McGarrie, M. et al. Features of electroweak symmetry breaking in five dimensional SUSY models. J. High Energ. Phys. 2015, 137 (2015). https://doi.org/10.1007/JHEP11(2015)137
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DOI: https://doi.org/10.1007/JHEP11(2015)137