{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.89399.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1728664"}},{"@id":"https://doi.org/10.1103/PhysRevLett.123.052001","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2019","description":"This letter describes the observation of the light-by-light scattering process, $\\gamma\\gamma\\rightarrow\\gamma\\gamma$, in Pb+Pb collisions at $\\sqrt{s_\\mathrm{NN}}$ = 5.02 TeV. The analysis is conducted using a data sample corresponding to an integrated luminosity of 1.73 nb$^{-1}$, collected in November 2018 by the ATLAS experiment at the LHC. Light-by-light scattering candidates are selected in events with two photons produced exclusively, each with transverse energy $E_{\\textrm{T}}^{\\gamma} > 3$ GeV and pseudorapidity $|\\eta_{\\gamma}| < 2.37$, diphoton invariant mass above 6 GeV, and small diphoton transverse momentum and acoplanarity. After applying all selection criteria, 59 candidate events are observed for a background expectation of 12 $\\pm$ 3 events. The observed excess of events over the expected background has a significance of 8.2 standard deviations. The measured fiducial cross section is 78 $\\pm$ 13 (stat.) $\\pm$ 7 (syst.) $\\pm$ 3 (lumi.) nb.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.89399.v1/t1","@type":"Dataset","description":"The diphoton acoplanarity A$_{\\phi}$ distribution for events satisfying the signal selection, but before the A$_{\\phi} &lt; 0.01$ requirement. Data points...","name":"Acoplanarity"},{"@id":"https://doi.org/10.17182/hepdata.89399.v1/t2","@type":"Dataset","description":"Diphoton transverse momentum for events satisfying the signal selection. Data (points) are compared with the sum of signal and background...","name":"pt"},{"@id":"https://doi.org/10.17182/hepdata.89399.v1/t3","@type":"Dataset","description":"Fiducial cross section for light-by-light scattering","name":"crossection"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1728664?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/89399"}],"inLanguage":"en","name":"Observation of light-by-light scattering in ultraperipheral Pb+Pb collisions with the ATLAS detector","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1728664?version=1","version":1}