Analyses of production and decay processes of the Higgs boson and of a new scalar in a warped extra dimension
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Abstract
The thesis investigates the interactions of the Higgs boson and of a new scalar in a framework "beyond the Standard Model of particle physics", in which the Standard Model is embedded in a Planck-sized region of a five-dimensional anti-de Sitter space: the Randall-Sundrum model. A strong warping of all physical scales along the fifth dimension solves i.a. the gauge hierarchy problem.
Mostly, a scenario of the Randall-Sundrum model is considered, in which all the particle fields including the Higgs field can extend into the five-dimensional space. It is proven that the predictions for Higgs processes lie significantly closer to the Standard Model's predictions, compared to realizations of the Randall-Sundrum model where the Higgs field is localized on a four-dimensional subspace at the end of the fifth dimension. Numerical evaluations of the various Higgs production and decay rates at the LHC are performed in dependence of the parameter space of the model and in comparison with experimental results from ATLAS and CMS. Furthermore, the implementation of a new, extra scalar field is elaborated in the Randall-Sundrum framework, by what the temporarily reported di-photon anomaly, seen as an excess of photon pairs in first 13 TeV data of the LHC, could conveniently be explained.