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We present a selection of results from our recent study of $pp\tot\bar{t}W^\pm$ production matched to partons showers at NLO QCD at the LHC.Theoretical predictions are obtained at perturbative orders$\mathcal{O}(\alpha_s^3\alpha)$ and $\mathcal{O}(\alpha_s\alpha^3)$, where thedifferent contributions are studied first separately at the inclusive levelbefore being combined within a realistic two same-sign lepton signature. Weinvestigate in detail uncertainties originating from missing higher-ordercorrections and from the parton-shower matching scheme employed.

Parton shower effects in $t\bar{t}W^\pm$ production at NLO QCD