Measurements of the ZZ production cross sections in the 2l2ν channel in proton–proton collisions at s√=7 and 8 TeV and combined constraints on triple gauge couplings

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Filipovic, Nicolas and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Karancsi, János and Molnár, József and Makovec, Alajos and Ujvári, Balázs and Veres, Gábor (2015) Measurements of the ZZ production cross sections in the 2l2ν channel in proton–proton collisions at s√=7 and 8 TeV and combined constraints on triple gauge couplings. EUROPEAN PHYSICAL JOURNAL C, 75 (10). ISSN 1434-6044

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Abstract

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 → 2l2ν, where l denotes an electron or a muon, are reconstructed and selected from data corresponding to an integrated luminosity of 5.1 (19.6) fb−1 at 7 (8) 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) pb at 7 TeV, and 7.2+0.8 −0.8 (stat) +1.9 −1.5 (syst) ± 0.2 (lumi) pb at 8 TeV, are in good agreement with the stan- dard 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 pub- lished CMS results for ZZ in 4l final states, yielding the most stringent constraints on the anomalous couplings.

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