The Large Hadron Collider (LHC) is a proton-proton collider operating at CERN. One of the multi-purpose apparatus built at LHC is the ATLAS detector which is designed to allow studies of the widest possible range of physics processes. The thesis is based on the data collected with the ATLAS experiment and on the Monte Carlo simulations of the detector. The analysis presented in this thesis might be divided into two parts. The first part is more technical and the Tile Calorimeter, especially its Monte Carlo simulations, is discussed there. The electron performance and the measurement of the \(Z \rightarrow \tau \tau \) cross section are presented in the other part of the thesis.
KeywordsMonte Carlo Simulation Large Hadron Collider Atlas Collaboration Decay Product Atlas Detector
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