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In the supersymmetric SU(5) grand unified theory whose gauge symmetry isbroken by virtue of the Hosotani mechanism, the huge mass splitting between thecolored Higgs triplet and the electroweak Higgs doublet superfields isnaturally realized. As a byproduct, the existence of adjoint chiral superfieldswith masses of the order of the supersymmetry breaking scale is predicted,leading to the Higgs sector that contains an SU(2)_L triplet chiral multipletwith hypercharge zero and a neutral singlet one in addition to the two SU(2)_Ldoublets of the minimal supersymmetric standard model. We focus on the Higgssector and investigate to what extent the couplings of the standard model-likeHiggs boson and the masses of the additional Higgs bosons deviate from those inthe Standard Model and other models due to the new triplet and singlet chiralmultiplets. We show that this model can be distinguished using precisionmeasurements of couplings and masses of the Higgs sector particles and servesas a good example of grand unification testable at colliders such as theluminosity up-graded Large Hadron Collider and future electron-positroncolliders.

Higgs Phenomenology as a Probe of Supersymmetric Grand Unification with the Hosotani Mechanism