Abstract
We perform a detailed investigation of a Grand Unified Theory (GUT)-inspired theory of gauge-Higgs unification. Scanning the model's parameter space with adapted numerical techniques, we contrast the scenario's low energy limit with existing SM and collider search constraints. We discuss potential modifications of di-Higgs phenomenology at hadron colliders as sensitive probes of the gauge-like character of the Higgs self-interactions and find that for phenomenologically viable parameter choices modifications of the order of 20% compared to the SM cross section can be expected. While these modifications are challenging to observe at the LHC, a future 100 TeV hadron collider might be able to constrain the scenario through more precise di-Higgs measurements. We point out alternative signatures that can be employed to constrain this model in the near future.
Highlights
The search for new physics beyond the Standard Model (BSM) is one of the key challenges of the current particle physics programme
Searches for deviations from the SM at large energies, most prominently at the Large Hadron Collider (LHC), which could point us in the direction of a more fundamental theory of nature have not revealed any statistically significant non-SM effects so far
The agreement with the SM of a plethora of measurements carried out at the LHC has cemented the SM as a surprisingly accurate electroweak scale description of the theory that completes the SM in the UV
Summary
The search for new physics beyond the Standard Model (BSM) is one of the key challenges of the current particle physics programme. In this work we take a different approach compared to traditional scalar Higgs sector extensions and consider theories with gauge-Higgs unification [23,24,25,26,27] In such scenarios, the self-interactions of the Higgs boson are fundamentally gauge-like. 3) Hosotani breaking [38,39,40], which acts as the electroweak symmetry breaking mechanism on the IR brane, breaking GSM to SU (3)C × U (1)EM through a non-vanishing expectation value θH of the associated Wilson loop This happens through the Az component of the gauge field, which is a bi-doublet under the SU (2)L × SU (2)R and plays the role of the usual SM Higgs boson [41].
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