Predictions for off-shell $t\bar{t}Z$ production at the LHC: the complete set of LO and NLO contributions

Differential top quark pair cross sections are measured in the dilepton final state as a function of kinematic variables associated to the dineutrino system.The measurements are performed making use of the Run 2 dataset collected by the CMS experiment at the CERN LHC collider, corresponding to proton-proton collisions recorded at center of mass energy of 13 TeV and an integrated luminosity of 138 fb -1 .The measured cross sections are found in agreement with theory predictions and Monte Carlo simulations of Standard Model processes.