Beyond The Standard Model: Some Aspects of Supersymmetry and Extra Dimension

TL;DR

This thesis investigates the phenomenological implications of warped and flat extra dimensional theories combined with supersymmetry, focusing on Higgs processes, radiative corrections, and electroweak symmetry breaking.

Contribution

It provides new numerical analyses of Higgs production and decay, computes radiative corrections in supersymmetric warped models, and introduces 5d versions of key supersymmetry parameter plots.

Findings

Warped extra dimensions significantly affect gg -> h and h -> γγ processes.

Radiative corrections from KK towers influence the lightest Higgs mass.

Electroweak symmetry breaking can be achieved in 5d supersymmetric models.

Abstract

In this thesis we have explored some of the phenomenological aspects of warped/flat extra dimensional theories and their interface with supersymmetry. We study the numerical impact of compactified warped extra dimension on the processes gg -> h and h -> \gamma \gamma, which are of paramount importance in the context of Higgs search at the LHC. We compute radiative correction to the lightest neutral Higgs mass induced by the Kaluza-Klein (KK) towers of fermions and sfermions in a supersymmetric warped extra dimension model. Next we make a more formal renormalization group study of a supersymmetric model embedded in a flat 5d scenario, with the inverse radius of compactification of the fifth dimension at the TeV scale. We show that radiative electroweak symmetry breaking can be achieved in this scenario. We construct for the first time, the 5d versions of the often displayed 4d m_0-M_{1/2} plots.