Aad, G.Abbott, B.Abdallah, J.Abdel Khalek, S.Abdinov, O.Aben, R.Abi, B.Izen, Joseph M.Leyton, MichaelLou, XinchouNamasivayam, HarisankarReeves, KendallATLAS Collaboration2014-10-022014-10-022014-06-132014-06-130031-9007http://hdl.handle.net/10735.1/4058Measurements 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_{ℓ⁺ℓ⁻} > 5  GeV and 80 < m_{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⁺μ⁻ events, the branching fraction for the Z boson decay to 4ℓ is determined to be (3.20 ± 0.25(stat) ± 0.13(syst))×10⁻⁶, consistent with the standard model prediction.en-USCC BY 3.0 (Attribution)©2014 CERN for the ATLAS Collaborationhttp://creativecommons.org/licenses/by/3.0/Leptons (Nuclear physics)Jets (Nuclear physics)MuonsProton-proton interactionsBranching fractions (Nuclear physics)TextAad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, et al. 2014. "Measurements of four-lepton production at the Z resonance in pp collisions at √s=7 and 8 TeV with ATLAS." Physical Review Letters 112(23), doi:10.1103/PhysRevLett.112.23180611223