Abstract
We study SO(10), SU(5) and flipped SU(5) GUT models with non-universal soft supersymmetry-breaking scalar masses, exploring how they are constrained by LHC supersymmetry searches and cold dark matter experiments, and how they can be probed and distinguished in future experiments. We find characteristic differences between the various GUT scenarios, particularly in the coannihilation region, which is very sensitive to changes of parameters. For example, the flipped SU(5) GUT predicts the possibility of ̃t1−χ coannihilation, which is absent in the regions of the SO(10) and SU(5) GUT parameter spaces that we study. We use the relic density predictions in different models to determine upper bounds for the neutralino masses, and we find large differences between different GUT models in the sparticle spectra for the same LSP mass, leading to direct connections of distinctive possible experimental measurements with the structure of the GUT group. We find that future LHC searches for generic missing ET, charginos and stops will be able to constrain the different GUT models in complementary ways, as will the Xenon 1 ton and Darwin dark matter scattering experiments and future FERMI or CTA γ-ray searches.
Highlights
We study SO(10), SU(5) and flipped SU(5) GUT models with non-universal soft supersymmetry-breaking scalar masses, exploring how they are constrained by LHC supersymmetry searches and cold dark matter experiments, and how they can be probed and distinguished in future experiments
We find that future LHC searches for generic missing ET, charginos and stops will be able to constrain the different GUT models in complementary ways, as will the Xenon 1 ton and Darwin dark matter scattering experiments and future FERMI or CTA γ-ray searches
We have identified different patterns of soft SUSY-breaking terms at the GUT scale, depending on the grand unification group, which we have used to distinguish different GUT scenarios via their dark matter predictions and the constraints from LHC searches
Summary
We study SO(10), SU(5) and flipped SU(5) GUT models with non-universal soft supersymmetry-breaking scalar masses, exploring how they are constrained by LHC supersymmetry searches and cold dark matter experiments, and how they can be probed and distinguished in future experiments. All quarks and leptons are accommodated in the same 16 representation, while we assume that the up and down Higgs multiplets are in a pair of 10 representations Since this assignment determines common sfermion mass matrices and beta functions, similar behaviour under RGE runs is to be expected. In this GUT model there is a common soft SUSYbreaking mass for all sfermions (squarks and sleptons) and two different masses for mhu and mhd. From this point of view, the SO(10) scenario can be identified with the NUHM2 studied previously [13], and we include it as a reference for comparison with other GUT groups.
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