NLO QCD corrections to tri-boson production

We present a calculation of the NLO QCD corrections for the production of three vector bosons at the LHC, namely ZZZ, W+W-Z, W+ZZ, and W+W-W+ production. The virtual corrections are computed using the recently proposed method of reduction at the integrand level (OPP reduction). Concerning the contributions coming from real emission we used the dipole subtraction to treat the soft and collinear divergences. We find that the QCD corrections for these electroweak processes are in the range between 70 and 100 percent. As such they have to be considered in experimental studies of triple vector boson production at the LHC.