We examine orbifold theories of grand unification with Scherk-Schwarz twisting, performing a renormalization group analysis and applying low energy experimental constraints. We rule out the minimal SU(5) models, and consider simple extensions including additional fields, such as an additional scalar field, or additional symmetries, such as $SU(5)\times U(1)$ or $E_6$. We find that it is very difficult to generate a large enough Higgs mass while simultaneously passing LHC experimental search constraints.

• Received 22 February 2019

DOI:https://doi.org/10.1103/PhysRevD.100.075016

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Published by the American Physical Society