Supersymmetry Searches in GUT Models with Non-Universal Scalar Masses

TL;DR

This paper investigates how different grand unified theories with non-universal scalar masses can be constrained and distinguished through current and future collider and dark matter experiments, revealing characteristic differences in their predicted particle spectra.

Contribution

It provides a comparative analysis of SO(10), SU(5), and flipped SU(5) GUT models with non-universal scalar masses, highlighting their unique experimental signatures and constraints.

Findings

Flipped SU(5) predicts $ ilde{t}_1- ext{chi}$ coannihilation, absent in other models.

Large differences in sparticle spectra for the same LSP mass across models.

Future experiments can effectively distinguish between GUT models.

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 predict the possibility of $\tilde{t}_1-\chi$ 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 $E_T$, 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 $\gamma$-ray searches.