{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.89875.v2","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1764342"}},{"@id":"https://doi.org/10.1007/JHEP03(2020)054","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2020","description":"CERN-LHC. \nMeasurement of the $Z\\gamma\\rightarrow \\ell^+ \\ell^- \\gamma$ production cross section in $pp$ collisions at $\\sqrt{s} = 13$ TeV with the ATLAS detector.\n\nThe production of a prompt photon in association with a Z boson is studied in proton--proton collisions at a centre-of-mass energy $\\sqrt{s} =$~13 TeV. The analysis uses a data sample with an integrated luminosity of 139 fb$^{-1}$ collected by the ATLAS detector at the LHC from 2015 to 2018. The production cross-section for the process $pp\\to\\ell^{+}\\ell^{-}\\gamma+X$ ($\\ell = e, \\mu$) is measured within a fiducial phase space region defined by kinematic requirements on the photon and the leptons, and by isolation requirements on the photon. An experimental precision of 2.9% is obtained on the fiducial cross-section. Differential cross-sections are measured as a function of each of six kinematic variables characterising the $\\ell^{+}\\ell^{-}\\gamma$ system. The data are compared to theoretical predictions based on next-to-leading-order and next-to-next-to-leading-order perturbative QCD calculations. The impact of next-to-leading-order electroweak corrections is also considered.\n\nThe fiducial region is defined as:\n- opposite sign same flavour lepton pair (electron or muon)\n- lepton $p_{\\mathrm{T}}>30, 25$ GeV, $|\\eta|<2.47$, dressed \n- photon $E_{\\mathrm{T}}>30$ GeV, $|\\eta|<2.37$. \n- $m_{\\ell\\ell}>40$ GeV, $m_{\\ell\\ell}+m_{\\ell\\ell\\gamma}>182$ GeV \n- $\\Delta R(\\ell, \\gamma)>0.4$\n- isolation energy (the scalar sum of $E_{\\mathrm{T}}$ for all stable particles except neutrinos and muons within a cone of $\\Delta R=0.2$) around photon must be less than 7% of the photon $E_{\\mathrm{T}}$.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.89875.v2/t1","@type":"Dataset","description":"The measured fiducial cross section. \"Uncor\" uncertainty includes all systematic uncertainties that are uncorrelated between electron and muon channels such...","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.89875.v2/t2","@type":"Dataset","description":"The measured fiducial cross section vs $E_{\\mathrm{T}}^\\gamma$. The central values are provided along with the statistical and systematic uncertainties together...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.89875.v2/t3","@type":"Dataset","description":"The measured fiducial cross section vs $|\\eta^\\gamma|$. The central values are provided along with the statistical and systematic uncertainties together...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.89875.v2/t4","@type":"Dataset","description":"The measured fiducial cross section vs $m(\\ell\\ell\\gamma)$. The central values are provided along with the statistical and systematic uncertainties together...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.89875.v2/t5","@type":"Dataset","description":"The measured fiducial cross section vs $p_{\\mathrm{T}}^{\\ell\\ell\\gamma}$. The central values are provided along with the statistical and systematic uncertainties together...","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.89875.v2/t6","@type":"Dataset","description":"The measured fiducial cross section vs $\\Delta\\phi(ll,\\gamma)$. The central values are provided along with the statistical and systematic uncertainties together...","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.89875.v2/t7","@type":"Dataset","description":"The measured fiducial cross section vs $p_{\\mathrm{T}}^{\\ell\\ell\\gamma}/m(\\ell\\ell\\gamma)$. The central values are provided along with the statistical and systematic uncertainties together...","name":"Table 7"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1764342?version=2"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/89875"}],"inLanguage":"en","name":"Measurement of the $Z(\\rightarrow\\ell^+\\ell^-)\\gamma$ production cross-section in $pp$ collisions at $\\sqrt{s} =13$ TeV with the ATLAS detector","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1764342?version=2","version":2}