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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 of proton--protoncollisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV recorded by theATLAS experiment at the LHC. In addition, a fit is performed in the 4$\ell$channel only, resulting in a cross section of $\sigma_{t\bar{t}Z} = 1.07 \pm0.26 \,\text{pb}$. This result is consistent with the combined fit and agreeswith the prediction by the Standard Model.

Top-quark pair production in association with a $Z$ boson in the 4$\ell$ channel with the ATLAS experiment