{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.73093.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1394677"}},{"@id":"https://doi.org/10.1016/j.physletb.2016.01.020","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ALICE Collaboration"},"creator":{"@type":"Organization","name":"ALICE Collaboration"},"datePublished":"2016","description":"CERN-LHC.  Direct photon production at mid-rapidity in Pb-Pb collisions at $\\sqrt{s_{_{\\mathrm{NN}}}} = 2.76$ TeV was studied in the transverse momentum range $0.9 < p_\\mathrm{T} < 14$ GeV$/c$. Photons were detected with the highly segmented electromagnetic calorimeter PHOS and via conversions in the ALICE detector material with the $e^+e^-$ pair reconstructed in the central tracking system. The results of the two methods were combined and direct photon spectra were measured for the 0-20%, 20-40%, and 40-80% centrality classes. For all three classes, agreement was found with perturbative QCD calculations for $p_\\mathrm{T} \\gtrsim 5$ GeV$/c$. Direct photon spectra down to $p_\\mathrm{T} \\approx 1$ GeV$/c$ could be extracted for the 20-40% and 0-20% centrality classes. The significance of the direct photon signal for $0.9 < p_\\mathrm{T} < 2.1$ GeV$/c$ is $2.6\\sigma$ for the 0-20% class. The spectrum in this $p_\\mathrm{T}$ range and centrality class can be described by an exponential with an inverse slope parameter of $(297 \\pm 12^\\mathrm{stat}\\pm 41^\\mathrm{syst})$ MeV. State-of-the-art models for photon production in heavy-ion collisions agree with the data within uncertainties.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.73093.v1/t1","@type":"Dataset","description":"Invariant differential yields of direct GAMMA produced in 0-20% central inelastic PbPb collisions at center-of-mass energy per nucleon 2.76 TeV.","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.73093.v1/t2","@type":"Dataset","description":"Invariant differential yields of direct GAMMA produced in 20-40% central inelastic PbPb collisions at center-of-mass energy per nucleon 2.76 TeV....","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.73093.v1/t3","@type":"Dataset","description":"Invariant differential yields of direct GAMMA produced in 40-80% central inelastic PbPb collisions at center-of-mass energy per nucleon 2.76 TeV....","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.73093.v1/t4","@type":"Dataset","description":"Double Ratio RGAMMA in 0-20% central inelastic PbPb collisions at center-of-mass energy per nucleon 2.76 TeV.","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.73093.v1/t5","@type":"Dataset","description":"Double Ratio RGAMMA in 20-40% central inelastic PbPb collisions at center-of-mass energy per nucleon 2.76 TeV.","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.73093.v1/t6","@type":"Dataset","description":"Double Ratio RGAMMA in 40-80% central inelastic PbPb collisions at center-of-mass energy per nucleon 2.76 TeV.","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.73093.v1/t7","@type":"Dataset","description":"Invariant differential yields of inclusive GAMMA produced in 0-20% central inelastic PbPb collisions at center-of-mass energy per nucleon 2.76 TeV.","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.73093.v1/t8","@type":"Dataset","description":"Invariant differential yields of inclusive GAMMA produced in 20-40% central inelastic PbPb collisions at center-of-mass energy per nucleon 2.76 TeV.","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.73093.v1/t9","@type":"Dataset","description":"Invariant differential yields of inclusive GAMMA produced in 40-80% central inelastic PbPb collisions at center-of-mass energy per nucleon 2.76 TeV.","name":"Table 9"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1394677?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/73093"}],"inLanguage":"en","name":"Direct photon production in Pb-Pb collisions at $\\sqrt{s_\\rm{NN}}$ = 2.76 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1394677?version=1","version":1}