In 2009 the experiments at the new Large Hadron Collider (LHC) accelerator facility at CERN (Geneva) became operational. In this accelerator protons are accelerated to energies up to 7 TeV. In collisions of protons with this energy new phenomena are expected: new particles such as the Higgs-boson or supersymmetry particles. In this project we carry out precision measurements on the top quark and a search for signals of supersymmetry.