  Results from inclusive and differential measurements of the production cross
sections for top quarks in proton-proton collisions at center-of-mass energies
of 7 and 8 TeV are compared to predictions at next-to-leading and
next-to-next-to-leading order in perturbative Quantum Chromodynamics. From
these studies, constraints on the top-quark mass, the strong coupling constant,
and on parton distributions functions are determined.
