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Beyond Standard Model Phenomenology at the LHC

This thesis provides an introduction to the physics of the Standard Model and beyond, and to the methods used to analyse Large Hadron Collider (LHC) data. The 'hierarchy problem', astrophysical data and experiments on neutrinos indicate that new physics can be expected at the now accessible TeV scale. This work investigates extensions of the Standard Model with gravitons and gravitinos (in the context of supergravity). The production of these particles in association with jets is studied as one of the most promising avenues for researching new physics at the LHC. Advanced simulation techniques and tools, such as algorithms allowing the computation of Feynman graphs and helicity amplitudes are first developed and then employed.

The main physics event of 2012 was the announcement on July the 4th of the
discovery of a new boson at CERN with a mass close to 126 GeV. The on-going
analysis of the properties of the particle discovered last year points with
increasing evidence to the long awaited for particle related to the Brout-Englert-
Higgs mechanism introduced in the 1960s. The main focus of the investigations
at the LHC experiments now shifts to the possibility of finding other high-energy
phenomena ...