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The PowHel framework allows to make predictions of total and differentialcross-sections of multiparticle hadroproduction processes at both NLO QCDaccuracy and NLO QCD matched to Parton Shower, on the basis of the interfacebetween the POWHEG-BOX and HELAC-NLO codes. It has already been applied tostudy several processes involving a top-antitop pair in association with athird particle or hadronic jet. Our most recent predictions concerntop-antitop-V hadroproduction (with V = W or Z), at both parton and hadronlevel, by considering different decay channels (hadronic and leptonic) of theheavy particles. In particular, we show the results of our phenomenologicalanalyses under the same system of cuts also recently adopted by the CMScollaboration at LHC.

Top-antitop pair hadroproduction in association with a heavy boson at the NLO QCD accuracy + Parton Shower