Measurements of the ZZZZ production cross sections in the 2l2ν2l2ν channel in proton–proton collisions at s√=7s=7 and 8 TeV8 TeV and combined constraints on triple gauge couplings

Abstract

Measurements of the ZZZZ production cross sections in proton–proton collisions at center-of-mass energies of 7 and 8 TeV TeV are presented. Candidate events for the leptonic decay mode ZZ→2l2νZZ→2l2ν, where ll denotes an electron or a muon, are reconstructed and selected from data corresponding to an integrated luminosity of 5.1 (19.6)fb-1fb-1 at 7 (8) TeV TeV collected with the CMS experiment. The measured cross sections, σ(pp→ZZ)=5.1+1.5−1.4(stat)+1.4−1.1(syst)±0.1(lumi)~pbσ(pp→ZZ)=5.1−1.4+1.5(stat)−1.1+1.4(syst)±0.1(lumi)~pb at 7 TeV TeV, and 7.2+0.8−0.8(stat)+1.9−1.5(syst)±0.2(lumi)~pb7.2−0.8+0.8(stat)−1.5+1.9(syst)±0.2(lumi)~pb at 8 TeV 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 ZZZZ 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 ZZZZ in 4ll final states, yielding the most stringent constraints on the anomalous couplings.