Measurements of the ZZ production cross sections in the 2l2 nu channel in proton-proton collisions at root s=7 and 8 TeV and combined constraints on triple gauge couplings

WOS: 000379515400002 ; 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 -> 2l2 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) fb(-1) at 7 (8) TeV collected with the CMS experiment. The measured cross sections, sigma(pp -> 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 4l final states, yielding the most stringent constraints on the anomalous couplings. ; Austrian Federal Ministry of Science, Research and Economy; Austrian Science FundAustrian Science Fund (FWF); Belgian Fonds de la Recherche ScientifiqueFonds de la Recherche Scientifique - FNRS; Fonds voor Wetenschappelijk OnderzoekFWO; CNPqNational Council for Scientific and Technological Development (CNPq); CAPESCAPES; FAPERJCarlos Chagas Filho Foundation for Research Support of the State of Rio de Janeiro (FAPERJ); FAPESPFundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); Bulgarian Ministry of Education and Science; CERN; Chinese Academy of SciencesChinese Academy of Sciences; Ministry of Science and Technology; National Natural Science Foundation of ChinaNational Natural Science Foundation of China; Colombian Funding Agency (COLCIENCIAS)Departamento Administrativo de Ciencia, Tecnologia e Innovacion Colciencias; Croatian Ministry of Science, Education and SportMinistry of Science, Education and Sports, Republic of Croatia; Croatian ...