Measurements of Four-Lepton Production at the Z Resonance in pp Collisions at √s=7 and 8 TeV with ATLAS
Date
2014-06-13
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Publisher
American Physical Society
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Abstract
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_{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.
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Keywords
Leptons (Nuclear physics), Jets (Nuclear physics), Muons, Proton-proton interactions, Branching fractions (Nuclear physics)
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CC BY 3.0 (Attribution), ©2014 CERN for the ATLAS Collaboration