Phenomenology of extra dimensions

Abstract

Scope and Method of Study: In this thesis, we propose three different methods to look for the existence of extra dimensions as predicted by the Universal Extra Dimensions (UED) with fat brane scenario. After a brief introduction, in the second chapter we give background on the Standard Model (SM) of particles and on the relevant theory describing the extra dimensions. Chapters three and four detail our proposed methods. Last chapter is reserved for conclusions.

Findings and Conclusions: The existence of extra dimensions is a very exciting idea not excluded by the present experimental results. We show that the future experiments at Large Hadron Collider have the potential to discover signature of extra dimensions in events involving production of jets plus missing energy. While the production of two jets plus missing energy gives an optimistic signal, the monojet plus missing energy channel can lead to the discovery of extra dimensions only when corroborated with a corresponding signal in the single photon plus missing energy channel. When taken into account, the idea of extra dimensions can also produce small, almost degenerate neutrino masses and naturally large mixing angles among them, with a bonus relation between the masses of the neutrinos and the charged leptons.