  The W+W- and ZZ production cross sections are measured in proton-proton
collisions at sqrt(s) = 8 TeV with the CMS experiment at the LHC in data
samples corresponding to an integrated luminosity of up to 5.3 inverse
femtobarns. The measurements are performed in the leptonic decay modes W+W- to
l' nu l'' nu and ZZ to 2l 2l', where l = e, mu and l'(l'') = e, mu, tau. The
measured cross sections sigma(pp to W+W-) = 69.9 +/- 2.8 (stat.) +/- 5.6
(syst.) +/- 3.1 (lumi.) pb and sigma(pp to ZZ) = 8.4 +/- 1.0 (stat.) +/- 0.7
(syst.) +/- 0.4 (lumi.) pb, for both Z bosons produced in the mass region 60 <
m[Z] < 120 GeV, are consistent with standard model predictions. These are the
first measurements of the diboson production cross sections at sqrt(s) = 8 TeV.
