Measurements of Four-Lepton Production at the Z Resonance in pp Collisions at √s=7 and 8 TeV with ATLAS

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dc.contributor.ORCID0000-0003-0867-2189 (Lou, X)en_US
dc.contributor.VIAF250674117 (Izen, JM)en_US
dc.contributor.VIAF250674117 (Izen, JM)
dc.contributor.authorAad, G.en_US
dc.contributor.authorAbbott, B.en_US
dc.contributor.authorAbdallah, J.en_US
dc.contributor.authorAbdel Khalek, S.en_US
dc.contributor.authorAbdinov, O.en_US
dc.contributor.authorAben, R.en_US
dc.contributor.authorAbi, B.en_US
dc.contributor.authorIzen, Joseph M.en_US
dc.contributor.authorLeyton, Michaelen_US
dc.contributor.authorLou, Xinchouen_US
dc.contributor.authorNamasivayam, Harisankaren_US
dc.contributor.authorReeves, Kendallen_US
dc.contributor.authorATLAS Collaborationen_US
dc.contributor.utdAuthorIzen, Joseph M.en_US
dc.contributor.utdAuthorLeyton, Michaelen_US
dc.contributor.utdAuthorNamasivayam, Harisankaren_US
dc.contributor.utdAuthorReeves, Kendallen_US
dc.contributor.utdAuthorLou, Xinchouen_US
dc.date.accessioned2014-10-02T19:06:57Z
dc.date.available2014-10-02T19:06:57Z
dc.date.created2014-06-13en_US
dc.date.issued2014-06-13en_US
dc.description.abstractMeasurements 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_US
dc.identifier.bibliographicCitationAad, 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.112.231806en_US
dc.identifier.issn0031-9007en_US
dc.identifier.issue23en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/4058
dc.identifier.volume112en_US
dc.language.isoen_USen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevLett.112.231806
dc.rightsCC BY 3.0 (Attribution)en_US
dc.rights©2014 CERN for the ATLAS Collaborationen_US
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en_US
dc.sourcePhysical Review Letters
dc.subjectLeptons (Nuclear physics)en_US
dc.subjectJets (Nuclear physics)en_US
dc.subjectMuonsen_US
dc.subjectProton-proton interactionsen_US
dc.subjectBranching fractions (Nuclear physics)en_US
dc.titleMeasurements of Four-Lepton Production at the Z Resonance in pp Collisions at √s=7 and 8 TeV with ATLASen_US
dc.typeTexten_US
dc.type.genreArticleen_US

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Izen, Joseph M.
Lou, Xinchou
NSM Staff-Student Research