{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.134246.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2071861"}},{"@id":"https://doi.org/10.1007/JHEP06(2023)024","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ALICE Collaboration"},"creator":{"@type":"Organization","name":"ALICE Collaboration"},"datePublished":"2022","description":"The first measurement of the ${\\rm e}^{+}{\\rm e}^{-}$ pair production at low lepton pair transverse momentum ($p_{\\rm T,ee}$) and low invariant mass ($m_{\\rm ee}$) in non-central Pb$-$Pb collisions at $\\sqrt{s_{\\rm NN}} = 5.02$ TeV at the LHC is presented. The dielectron production is studied with the ALICE detector at midrapidity ($|\\eta_{\\rm e}| < 0.8$) as a function of invariant mass ($0.4 \\leq m_{\\rm ee} < 2.7$ GeV/$c^2$) in the 50$-$70% and 70$-$90% centrality classes for $p_{\\rm T,ee} < 0.1$ GeV/$c$, and as a function of $p_{\\rm T,ee}$ in three $m_{\\rm ee}$ intervals in the most peripheral Pb$-$Pb collisions. Below a $p_{\\rm T,ee}$ of 0.1 GeV/$c$, a clear excess of ${\\rm e}^{+}{\\rm e}^{-}$ pairs is found compared to the expectations from known hadronic sources and predictions of thermal radiation from the medium. The $m_{\\rm ee}$ excess spectra are reproduced, within uncertainties, by different predictions of the photon$-$photon production of dielectrons, where the photons originate from the extremely strong electromagnetic fields generated by the highly Lorentz-contracted Pb nuclei. Lowest-order quantum electrodynamic (QED) calculations, as well as a model that takes into account the impact-parameter dependence of the average transverse momentum of the photons, also provide a good description of the $p_{\\rm T,ee}$ spectra. The measured $\\sqrt{\\langle p_{\\rm T,ee}^{2} \\rangle}$ of the excess $p_{\\rm T,ee}$ spectrum in peripheral Pb$-$Pb collisions is found to be comparable to the values observed previously at RHIC in a similar phase-space region.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.134246.v1/t1","@type":"Dataset","description":"Differential $e^+e^-$ yield in 50--70\\% Pb--Pb collisions at $\\sqrt{s_{\\rm NN}}$ = 5.02 TeV as a function of $m_{\\rm ee}$ for...","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.134246.v1/t2","@type":"Dataset","description":"Differential $e^+e^-$ yield in 70--90\\% Pb--Pb collisions at $\\sqrt{s_{\\rm NN}}$ = 5.02 TeV as a function of $m_{\\rm ee}$ for...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.134246.v1/t3","@type":"Dataset","description":"Differential excess $e^+e^-$ yield in 50--70\\% Pb--Pb collisions at $\\sqrt{s_{\\rm NN}}$ = 5.02 TeV as a function of $m_{\\rm ee}$...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.134246.v1/t4","@type":"Dataset","description":"Differential excess $e^+e^-$ yield in 70--90\\% Pb--Pb collisions at $\\sqrt{s_{\\rm NN}}$ = 5.02 TeV as a function of $m_{\\rm ee}$...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.134246.v1/t5","@type":"Dataset","description":"Differential $e^+e^-$ yield in 70--90\\% Pb--Pb collisions at $\\sqrt{s_{\\rm NN}}$ = 5.02 TeV as a function of $p_{\\rm T,ee}$ for...","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.134246.v1/t6","@type":"Dataset","description":"Differential $e^+e^-$ yield in 70--90\\% Pb--Pb collisions at $\\sqrt{s_{\\rm NN}}$ = 5.02 TeV as a function of $p_{\\rm T,ee}$ for...","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.134246.v1/t7","@type":"Dataset","description":"Differential $e^+e^-$ yield in 70--90\\% Pb--Pb collisions at $\\sqrt{s_{\\rm NN}}$ = 5.02 TeV as a function of $p_{\\rm T,ee}$ for...","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.134246.v1/t8","@type":"Dataset","description":"Differential excess $e^+e^-$ yield in 70--90\\% Pb--Pb collisions at $\\sqrt{s_{\\rm NN}}$ = 5.02 TeV as a function of $p^{2}_{\\rm T,ee}$...","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.134246.v1/t9","@type":"Dataset","description":"Differential excess $e^+e^-$ yield in 70--90\\% Pb--Pb collisions at $\\sqrt{s_{\\rm NN}}$ = 5.02 TeV as a function of $p^{2}_{\\rm T,ee}$...","name":"Table 9"},{"@id":"https://doi.org/10.17182/hepdata.134246.v1/t10","@type":"Dataset","description":"Differential excess $e^+e^-$ yield in 70--90\\% Pb--Pb collisions at $\\sqrt{s_{\\rm NN}}$ = 5.02 TeV as a function of $p^{2}_{\\rm T,ee}$...","name":"Table 10"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2071861?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/134246"}],"inLanguage":"en","name":"Dielectron production at midrapidity at low transverse momentum in peripheral and semi-peripheral Pb$-$Pb collisions at $\\sqrt{s_{\\rm NN}} = 5.02$ TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2071861?version=1","version":1}