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CMS_2012_I1298807

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A measurement of the inclusive ZZ production cross section and constraints on anomalous triple gauge couplings in proton-proton collisions at s=8TeV are presented. The analysis is based on a data sample, corresponding to an integrated luminosity of 19.6/fb, collected with the CMS experiment at the LHC. The measurements are performed in the leptonic decay modes ZZllll, where l=e,μ and l=e,μ,τ. The measured total cross section σ(ppZZ)=7.7±0.5(stat)+0.50.4(syst)±0.4(theo)±0.2(lumi)pb, for both Z bosons produced in the mass range 60<mZ<120GeV, is consistent with standard model predictions. Differential cross sections, in phase space pT(μ)>5GeV, pT(e)>7GeV, |η(μ)|<2.4 , |η(e)|<2.5 and the 60--120 \text{GeV} mass requirement, are measured and well described by the theoretical predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZγ couplings at the 95\% confidence level, 0.004<f4Z<0.004, 0.004<f5Z<0.004, 0.005<f4γ<0.005, and 0.005<f5γ<0.005.

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