  Measurements of the ZZ production cross sections in proton-proton collisions
at center-of-mass energies of 7 and 8 TeV are presented. Candidate events for
the leptonic decay mode ZZ to 2 l 2 nu, where l denotes an electron or a muon,
are reconstructed and selected from data corresponding to an integrated
luminosity of 5.1 (19.6) inverse femtobarns at 7 (8) TeV collected with the CMS
experiment. The measured cross sections, sigma(pp to ZZ) = 5.1 -1.4 +1.5 (stat)
-1.1 +1.4 (syst) +/- 0.1 (lumi) pb at 7 TeV, and 7.2 -0.8 +0.8 (stat.) -1.5
+1.9 (syst) +/- 0.2 (lumi) pb at 8 TeV, are in good agreement with the standard
model predictions with next-to-leading-order accuracy. The selected data are
analyzed to search for anomalous triple gauge couplings involving the ZZ final
state. In the absence of any deviation from the standard model predictions,
limits are set on the relevant parameters. These limits are then combined with
the previously published CMS results for ZZ in 4 l final states, yielding the
most stringent constraints on the anomalous couplings.
