My research mainly concerns the ATLAS experiment at the CERN, near Geneva. ATLAS is a detector used to analyze the results of the collisions produced by the Large Hadron Collider (LHC), by far the most powerful particle accelerator ever built. We are just at the beginning of the ATLAS experiment. This marks one of the most exciting times in the history of fundamental physics. For the first time, the LHC lets us attain the tera-electron-volt energy scale, where we expect to encounter new fundamental physics, such as the creation of dark matter in the laboratory, the discovery of new spatial dimensions and supersymmetry. We have already discovered the Higgs boson, a central particle in the model of particle physics, since it apparently gives mass to other particles.