W±Z production at hadron colliders in NNLO QCD

We report on the first computation of the next-to-next-to-leading order (NNLO) QCD corrections to W±ZW±Z production in proton collisions. We consider both the inclusive production of on-shell W±ZW±Z pairs at LHC energies and the total W±ZW±Z rates including off-shell effects of the W and Z bosons. In the off-shell computation, the invariant mass of the lepton pairs from the Z   boson decay is required to be in a given mass window, and the results are compared with the corresponding measurements obtained by the ATLAS and CMS collaborations. The NNLO corrections range from 8%8% at s=7TeV to 11%11% at s=14TeV and significantly improve the agreement with the LHC data at s=7 and 8TeV.