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Measurements of the ZZ production cross sections in the 2l2nu channel in proton-proton collisions at 7 and 8 TeV and combined costraints on triple gauge couplings

Title
Measurements of the ZZ production cross sections in the 2l2nu channel in proton-proton collisions at 7 and 8 TeV and combined costraints on triple gauge couplings
Author
김태정
Issue Date
2015-10
Publisher
SPRINGER
Citation
EUROPEAN PHYSICAL JOURNAL C, (2015) 75:511
Abstract
Measurements of the ZZ ZZ 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 ZZ 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 ZZ in 4 ll final states, yielding the most stringent constraints on the anomalous couplings.
URI
https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-015-3706-0http://hdl.handle.net/20.500.11754/27982
ISSN
1434-6044; 1434-6052
DOI
10.1140/epjc/s10052-015-3706-0
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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