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arXiv · 1109.4958

Unification and Phenomenology of F-Theory GUTs with U(1)_PQ

Matthew J. Dolan·Joseph Marsano·Sakura Schafer-Nameki
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Abstract

We undertake a phenomenological study of SU(5) F-theory GUT models with an additional U(1)_{PQ} symmetry. In such models, breaking SU(5) with hypercharge flux leads to the presence of non-GUT multiplets in the spectrum. We study the effect these have on the unification of gauge couplings, including two-loop running as well as low- and high-scale threshold corrections. We use the requirement of unification to constrain the size of thresholds from KK modes of SU(5) gauge and matter fields. Assuming the non-GUT multiplets play the role of messengers of gauge mediation leads to controlled non-universalities in the sparticle spectrum while maintaining grand unification, and we study the LHC phenomenology of this scenario. We find that the MSSM spectrum may become compressed or stretched out {by up to a factor of three} depending on the distribution of hypercharge flux. We present a set of benchmark points whose production cross-sections and decays we investigate, and argue that precision kinematic edge measurements will allow the LHC to distinguish between our model and mGMSB.

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Matthew J. Dolan, Joseph Marsano, Sakura Schafer-Nameki. 2011-09-22. Unification and Phenomenology of F-Theory GUTs with U(1)_PQ. https://doi.org/10.1007/jhep12(2011)032

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