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 Unification and Phenomenology of F-Theory GUTs with U1 PQ


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We undertake a phenomenological study of SU5 F-theory GUT models with an additional U1 {PQ} symmetry. In such models, breaking SU5 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 SU5 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.



Author: Matthew J. Dolan; Joseph Marsano; Sakura Schafer-Nameki

Source: https://archive.org/







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