MEASUREMENTS OF JET PRODUCTION AND THE STRONG COUPLING CONSTANT AT ATLAS

Various measurements using dijet events are presented. The measurement of new event-shape jet observables defined in terms of reference geometries with cylindrical and circular symmetries using the energy mover's distance are discussed. In addition, measurements of variables probing the properties of the multijet energy flow and cross-section ratios of two- and three-jet production are highlighted. The measurements are compared to state-of-the-art NLO and NNLO predictions, and used to determine the strong coupling constant. Finally, a precise measurement of the production properties of the Z-boson in the full phase space of the decay leptons is presented. The recoil of the Z-boson is sensitive to quark and gluon emissions and is used to determine the strong coupling constant in a novel approach. The analysis is facilitated by state-of-the-art predictions at third-order accuracy in perturbative QCD, supplemented by resummation of logarithmically-enhanced contributions in the small transverse-momentum region of the lepton pairs (N3LO+N4LL).