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The cross section of the $t\bar{t}Z$ and $t\bar{t}W$ processes are measuredin a simultaneous fit using 36.1 $\text{fb}^{-1}$ of proton-proton collisionsat a centre of mass energy of $\sqrt{s}=13$ TeV recorded by the ATLAS detectorat the LHC. The result is found to be $\sigma_{t\bar{t}Z} = 0.95 \pm 0.08\text{ (stat.)} \pm 0.10 \text{ (syst.)}\,\text{pb}$ and $\sigma_{t\bar{t}W} =0.87 \pm 0.13 \text{ (stat.)} \pm 0.14 \text{ (syst.)}\,\text{pb}$ andcompatible with the Standard Model.

Top-quark pair production in association with a W or Z boson with the ATLAS experiment