------------------------------------------------------------------------------------------------------------------ Speaker: Pedro Silva (CERN) ------------------------------------------------------------------------------------------------------------------ Title: "Precision measurements using Top quarks at the Large Hadron Collider" ------------------------------------------------------------------------------------------------------------------ Abstract: We give an overview of recent measurements obtained by the CMS experiment for the production of top quark pairs and single top quarks from proton-proton collisions at the Large Hadron Collider. Results are used to derive precision measurements of the strong coupling constant and of the CKM matrix element V_{tb}. Differential cross section measurements are further used to test different signal predictions and to study systematic uncertainties, yielding crucial inputs to the determination of the top quark mass. The current status of the top mass measurements, based on several channels and different techniques, is reviewed. ------------------------------------------------------------------------------------------------------------------