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Measurements of top quark pair production in association with a Z boson($\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$) provide direct tests of the couplingof top quarks and Z bosons, as well as the description of the productionmechanism in QCD. The measurements can be used to constrain possiblecontributions from anomalous top quark-Z boson couplings. A first differential$\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$ production measurement has beenperformed by the CMS experiment using events with three leptons collected in2016 & 2017. The differential cross sections are reported as functions of the Zboson transverse momentum, and of the angle between the Z boson and one of itsdecay leptons, boosted to the Z boson's rest frame. The results are compared tostate-of-the-art theory predictions.

Differential measurement of $\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$ production at $\sqrt{s}=13\,\mathrm{TeV}$ with the CMS experiment