Higgs Phenomenology of the Supersymmetric Grand Unification with the Hosotani Mechanism

TL;DR

This paper explores a supersymmetric grand unified theory with the Hosotani mechanism, predicting extended Higgs sectors and deviations from Standard Model Higgs properties, which can be tested at future colliders.

Contribution

It introduces a SUSY SU(5) GUT model with the Hosotani mechanism, extending the Higgs sector and providing testable predictions for collider experiments.

Findings

Extended Higgs sector with triplet and singlet supermultiplets.

Deviations in Higgs couplings and masses from Standard Model predictions.

Potential for experimental verification at future colliders.

Abstract

The supersymmetric SU(5) grand unified theory with the gauge symmetry broken by the Hosotani mechanism naturally solves the mass hierarchy problem between the colored Higgs triplet and the electroweak Higgs doublet, and predicts the existence of adjoint chiral superfields with masses of the order of the supersymmetry breaking scale as a byproduct. In addition to the two SU(2)_L Higgs doublets of the minimal supersymmetric standard model, the Higgs sector is extended by an SU(2)_L triplet chiral supermultiplet with hypercharge zero and a neutral singlet one. Such new triplet and singlet chiral supermultiplets deviate the standard model-like Higgs boson couplings and the additional Higgs boson masses from their Standard Model predictions. We show that this model can be distinguished from other new physics models using by precisely measuring such Higgs couplings and masses, and that our model is a good example of grand unification testable at the luminosity up-graded Large Hadron Collider and future electron-positron colliders.