Publikace na Matematicko-fyzikální fakulta |
2011
Abstrakt
We present a new measurement of the production cross section sigma(p (p) over bar -} ZZ) at a center-of-mass energy sqrt(s) = 1.96 TeV, obtained from the analysis of the four charged lepton final state l(+)l(-)l''(+)l''-(l,l'' = e or mu). We observe ten candidate events with an expected background of 0: 37 +/- 0: 13 events.
The measured cross section sigma(p (p) over bar -} ZZ) = 1.26(-0.37)(+0.47)(stat) +/- 0.14(syst) pb is in agreement with NLO QCD predictions. This result is combined with a previous result from the ZZ -} l(+)l(-)v (v) over bar channel resulting in a combined cross section of sigma(p (p) over bar -} ZZ) = 1.40(-0.37)(+0.43)(stat) +/- 0.14(syst) pb.