2011/09/29 by Hsu, Shih-Chieh
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)
paper · doi:10.48550/arxiv.1109.6670
A measurement of the ZZ production cross section in proton-proton collisions at sqrts = 7 TeV using data collected by the ATLAS experiment at the LHC is presented. In a data sample corresponding to an integrated luminosity of 1.02fb-1, 12 events containing two Z boson candidates decaying to electrons and/or muons were observed. The expected background contribution is 0.3+0.9-0.3 (stat) +0.4-0.3 (syst) events. The total cross section for on-shell ZZ production has been determined to be σZZtot= 8.4+2.7-2.3(stat) +0.4-0.7(syst)± 0.3 (lumi) pb and is compatible with the Standard Model expectation of 6.5+0.3-0.2 pb calculated at the next-to-leading order in QCD. Limits on anomalous neutral triple gauge boson couplings are derived.