The Search for Extra Dimensions and the Atlas Forward Calorimeter

Models of extra dimensions such as the ADD model can be tested at the LHC with the ATLAS detector. Experimental consequences of such models include the production of Kaluza-Klein states of the graviton at TeV energy levels. Accurate detection of events with signatures of missing transverse energy as in graviton production, requires close to hermetic calorimetry coverage. The forward calorimeter in ATLAS is essential for this purpose. This thesis describes some features of models of extra dimensions and their signals in the context of the ATLAS calorimetry system with special emphasis on the forward calorimeter. The results of studies on the sensitivity of ATLAS to signals of extra dimensions showing that models like ADD will be confirmed or ruled out over a significant range of their parameter space at the LHC are discussed.