The calculation of NLO QCD corrections to the $t\bar{ t}\to W^{ +}W^{ -}b\bar{ b}\to e^{ +}\nu_e \mu^{ -}\bar{ \nu}_{ \mu}b\bar{ b}$ process with complete off-shell effects, is briefly summarized. Besides the total cross section and its scale dependence, a few differential distributions at the TeVatron run II and LHC are given. All results presented in this contribution have been obtained with the help of the HELAC-NLO Monte Carlo framework.
Categories: hep-ph hep-ex