{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.18593.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1394865"}},{"@id":"https://doi.org/10.1016/j.physletb.2015.12.048","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2016","description":"CERN-LHC.  The four-lepton ($4\\ell$, $\\ell = e, \\mu$) production cross section is measured in the mass range from 80 to 1000 GeV using 20.3 fb$^{-1}$ of data in $pp$ collisions at $\\sqrt{s}=8$ TeV collected with the ATLAS detector at the LHC. The $4\\ell$ events are produced in the decays of resonant $Z$ and Higgs bosons and the non-resonant $ZZ$ continuum originating from $q\\bar q$, $gg$, and $qg$ initial states. A total of 476 signal candidate events are observed with a background expectation of $26.2 \\pm 3.6$ events, enabling the measurement of the integrated cross section and the differential cross section as a function of the invariant mass and transverse momentum of the four-lepton system. In the mass range above 180 GeV, assuming the theoretical constraint on the $q\\bar q$ production cross section calculated with perturbative NNLO QCD and NLO electroweak corrections, the signal strength of the gluon-fusion component relative to its leading-order prediction is determined.\n\nThe experimental fiducial region for four-lepton analysis is defined as:\n- 4e, 4mu or 2e2mu.\n- The leading dilepton pair is selected as the one with invariant mass closest to the Z-boson mass.\n- The sub-leading dilepton pair is selected among the remaining possible pairs with largest invariant mass.\n- ptLepton > 6 (7) GeV for muons (electrons).\n- |etaLepton| < 2.7 (2.5) for muons (electrons).\n- ptDilepton > 2 GeV.\n- ptLepton > 20, 15, 8 (10) GeV for leading, sub-leading and third muons (electrons).\n- min(DeltaR(l,l)) > 0.1 (0.2) for same- (different-) flavour leptons.\n- Leading dilepton invariant mass between 50 and 120 GeV.\n- Sub-leading dilepton invariant mass between 12 and 120 GeV.\n- All same-flavor opposite-sign lepton pairs should have invariant mass larger than 5 GeV.\n- Four-lepton invariant mass between 80 and 1000 GeV.\n\nUPDATE 25/04/2016: Covariance matrices were previously given without systematic uncertaintis. This mistake has been corrected.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.18593.v1/t1","@type":"Dataset","description":"The measured differential cross-section distributions in unit of fb/TeV of $m_{4\\ell}$ unfolded into the fiducial phase space, and compared to...","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.18593.v1/t2","@type":"Dataset","description":"The measured differential cross-section distributions in unit of fb/TeV of $p_{T}^{4\\ell}$ unfolded into the fiducial phase space, and compared to...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.18593.v1/t3","@type":"Dataset","description":"Measured cross sections in the fiducial phase space ($\\sigma^\\mathrm{fid}$) and extended phase space ($\\sigma^\\mathrm{ext}$), compared to their SM predictions. One...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.18593.v1/t4","@type":"Dataset","description":"The total uncertainty covariance matrix for measured differential cross sections in $m_{4\\ell}$ bins in fiducial volume. The matrix elements are...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.18593.v1/t5","@type":"Dataset","description":"The total uncertainty covariance matrix for measured differential cross sections in $p_\\mathrm{T}^{4\\ell}$ bins in fiducial volume. The matrix elements are...","name":"Table 5"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1394865?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/18593"}],"inLanguage":"en","name":"Measurements of four-lepton production in $pp$ collisions at $\\sqrt{s}=$ 8 TeV with the ATLAS detector","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1394865?version=1","version":1}