Differential top quark pair production measurements

The large number of top quarks produced at the CERN Large Hadron Collider makes it possible to measure the top quark pair production cross-section differentially with respect to di fferent observables. Di fferential measurements are important for precision tests and comparisons with Monte Carlo simulations and theoretical calculations. Top quark pair production in particular is also an important process to study because it is a large background for many analyses. In this paper, several top quark pair production di fferential measurements, performed with the ATLAS detector, are described including measurements of the kinematics of the top quark pair system, measurements of jet multiplicity, and measurements of jet activity.