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Measuring precisely top-pair-associated processes at hadron colliders willbecome possible with the upcoming LHC running stages. The increased datastatistics will especially enable differential measurements leading to animproved characterisation of such processes. Aiming at a consistent data-theorycomparison, precise Standard-Model predictions are needed, includinghigher-order corrections and full off-shell effects. In this work we presentNLO-accurate predictions for the production and decay of a top-antitop pair inassociation with a Z boson at the LHC, in the multi-lepton decay channel. Thecomplete set of LO contributions and NLO corrections of EW and QCD origin isincluded. The calculation is based on full matrix elements, computed with allresonant and non-resonant contributions, complete spin correlations andinterference effects. Integrated and differential cross-sections are presentedfor a realistic fiducial setup.

Complete NLO corrections to off-shell $\text{t}\overline{\text{t}}\text{Z}$ production at the LHC