Higher-Order Corrections for ttW Production

We study higher-order QCD and Electroweak corrections for the associated production of a top-antitop quark pair and a W boson (t ̄tW production) in proton-proton collisions. We calculate the NLO cross sections as well as the approximate NNLO cross sections, with second-order soft-gluon corrections added to the complete NLO result, including uncertainties from scale dependence and from parton distributions. We also calculate differential distributions in top-quark transverse momentum and rapidity.