Measurement of differential $t\bar{t}$ cross sections in the dilepton decay channels with the CMS detector at 7 TeV centre-of-mass energy

After commissioning of the Large Hadron Collider at the European nuclear researchcentre CERN, the CMS detector had recorded data with an integrated luminosity of1.1 fb−1 at a centre-of-mass energy of 7 TeV already in Summer 2011. With this, it waspossible for the rst time to accurately measure properties of the top quark with highstatistics.The work presented here focuses on the measurement of normalised dierential topquark pair production cross sections in the decay channel into nal states with twooppositely charged leptons. The measurement is presented in dependence of kinematicproperties of the top quarks, the top quark pair, the leptons, and the lepton pair.The distributions allow for detailed testing of perturbative quantum chromodynamicsand thus the Standard Model of particle physics.