ZZ production at the LHC: Fiducial cross sections and distributions in NNLO QCD

We consider QCD radiative corrections to the production of four charged leptons in the ZZ   signal region at the LHC. We report on the complete calculation of the next-to-next-to-leading order (NNLO) corrections to this process in QCD perturbation theory. Numerical results are presented for s=8 TeV, using typical selection cuts applied by the ATLAS and CMS Collaborations. The NNLO corrections increase the NLO fiducial cross section by about 15%15%, and they have a relatively small impact on the shape of the considered kinematical distributions. In the case of the ΔΦ distribution of the two Z candidates, the computed corrections improve the agreement of the theoretical prediction with the CMS data.