| Resumen |
We present a new measurement of the production cross section σ(pp̄→ZZ) at a center-of-mass energy √s=1=1.96 TeV, obtained from the analysis of the four charged lepton final state ℓ + ℓ − ℓ′ + ℓ′ − (ℓ, ℓ′ = e or μ). We observe ten candidate events with an expected background of 0.37±0.13 events. The measured cross section σ(pp →ZZ)=1.26 +0.47 −0.37 (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 − νν¯ channel resulting in a combined cross section of σ(pp̄→ZZ)=1.40 +0.43 −0.37 (stat)±0.14(syst)pb. |
