Ponente
Descripción
The ratio R32 of the three-jet to the two-jet inclusive differential cross sections is a well-established tool to study perturbative QCD. In this work, this observable is adapted to top-quark physics by considering the ratio of the $t\bar{t}$+jet to the $t\bar{t}$ cross sections as a function of different kinematic variables. Theoretical predictions are provided at next-to-leading order using the Powheg generator matched to the Pythia parton shower, and its dependence with the top-quark pole mass and the strong coupling are investigated, as well as its theoretical uncertainties. Recent theoretical work from independent groups have very recently incorporated NNLO QCD corrections to this observable, with the consequent reduction on the scale uncertainties. All things considered, these results show promising trends for the determination of both parameters at the CMS Experiment.
