Measurements of Four-Lepton Production at the Z Resonance in pp Collisions at √s = 7 and 8 TeV with ATLAS
Author(s)Taylor, Frank E.
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Measurements of four-lepton (4ℓ, ℓ = e,μ) production cross sections at the Z resonance in pp collisions at the LHC with the ATLAS detector are presented. For dilepton and four-lepton invariant mass regions m[subscript ℓ+ℓ−] > 5 GeV and 80 < m[subscript 4ℓ] < 100 GeV, the measured cross sections are 76 ± 18(stat) ± 4(syst) ± 1.4(lumi) fb and 107 ± 9(stat) ± 4(syst) ± 3.0(lumi) fb at √s = 7 and 8 TeV, respectively. By subtracting the nonresonant 4ℓ production contributions and normalizing with Z → μ[superscript +]μ[superscript −] events, the branching fraction for the Z boson decay to 4ℓ is determined to be (3.20 ± 0.25(stat) ± 0.13(syst)) × 10[superscript −6], consistent with the standard model prediction.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review Letters
American Physical Society
Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, et al. “Measurements of Four-Lepton Production at the Z Resonance in pp Collisions at √s = 7 and 8 TeV with ATLAS.” Physical Review Letters 112, no. 23 (June 2014). © 2014 CERN, for the ATLAS Collaboration
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