Associated Production of a Heavy Boson (Z/W/Higgs) with Two Top Quarks

The measurement of the associated production of a heavy boson with two top quarks (ttbar+W/Z/Higgs) allows for stringent tests of perturbative QCD. This talk presents the most recent cross section measurements of tt+W/Z/H production performed by the ATLAS experiment based on the he pp collision dataset collected at 13 TeV, and comparison to the state-of-the-art theory predictions.