{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.166083.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2693299"}},{"@id":"https://doi.org/10.1103/xl6m-vbqk","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ALICE Collaboration"},"creator":{"@type":"Organization","name":"ALICE Collaboration"},"datePublished":"2025","description":"The first measurement of the e$^+$e$^-$ pair production at midrapidity and low invariant mass in central Pb$-$Pb collisions at $\\sqrt{s_{\\mathrm{NN}}}=5.02$ TeV at the LHC is presented. The yield of e$^+$e$^-$ pairs is compared with a cocktail of expected hadronic decay contributions in the invariant mass ($m_{\\rm ee}$) and pair transverse momentum ($p_{\\rm T,ee}$) ranges $m_{\\rm ee} < 3.5$ GeV$/c^2$ and $p_{\\rm T,ee} < 8$ GeV$/c$. For $0.18 < m_{\\rm ee} < 0.5$ GeV$/c^2$ the ratio of data to the cocktail of hadronic contributions amounts to $1.40 \\pm 0.11 \\ ({\\rm stat.}) \\pm 0.23 \\ ({\\rm syst.}) \\pm 0.16 \\ ({\\rm cocktail})$ and $1.42 \\pm 0.11 \\ ({\\rm stat.}) \\pm 0.23 \\ ({\\rm syst.}) ^{+0.24}_{-0.29} \\ ({\\rm cocktail})$, including or not including medium effects in the estimation of the heavy-flavor background, respectively. It is consistent with predictions from two different models for an additional contribution of thermal e$^+$e$^-$ pairs from the hadronic and partonic phases. In the intermediate-mass range ($1.2 < m_{\\rm ee} < 2.6$ GeV$/c^2$), the pair transverse impact parameter of the e$^+$e$^-$ pairs (DCA$_{\\rm ee}$) is used for the first time in Pb$-$Pb collisions to separate displaced dielectrons from heavy-flavor hadron decays from a possible (thermal) contribution produced at the interaction point. The data are consistent with a suppression of e$^+$e$^-$ pairs from ${\\rm c\\overline{c}}$ and an additional prompt component. Finally, the first direct-photon measurement in the 10% most central Pb$-$Pb collisions at $\\sqrt{s_{\\mathrm{NN}}}=5.02$ TeV is reported via the study of virtual direct photons in the transverse momentum range $1 < p_{\\rm T} < 5$ GeV$/c$. A model including prompt photons, as well as photons from the pre-equilibrium and fluid-dynamic phases, can reproduce the result, while being at the upper edge of the data uncertainties.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.166083.v1/t1","@type":"Dataset","description":"Dielectron invariant mass spectrum in Pb--Pb collisions at $\\sqrt{s_{NN}}$ = 5.02 TeV for the 0--10\\% centrality class. Electrons are measured...","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.166083.v1/t2","@type":"Dataset","description":"Dielectron invariant mass spectrum of excess in Pb--Pb collisions at $\\sqrt{s_{NN}}$ = 5.02 TeV for the 0--10\\% centrality class. Electrons...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.166083.v1/t3","@type":"Dataset","description":"Dielectron invariant mass spectrum of excess in Pb--Pb collisions at $\\sqrt{s_{NN}}$ = 5.02 TeV for the 0--10\\% centrality class. Electrons...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.166083.v1/t4","@type":"Dataset","description":"Dielectron pair $p_{T}$ spectrum for $0.18 &lt; m_{\\rm ee} &lt; 0.34$ GeV/$c^{2}$ in Pb--Pb collisions at $\\sqrt{s_{NN}}$ = 5.02 TeV...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.166083.v1/t5","@type":"Dataset","description":"Dielectron pair $p_{\\rm T}$ spectrum for $1.2 &lt; m_{\\rm ee} &lt; 2.6$ GeV/$c^{2}$ in Pb--Pb collisions at $\\sqrt{s_{NN}}$ = 5.02...","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.166083.v1/t6","@type":"Dataset","description":"Dielectron pair DCA spectrum for $2.6 &lt; m_{\\rm ee} &lt; 3.1$ GeV/$c^{2}$ in Pb--Pb collisions at $\\sqrt{s_{NN}}$ = 5.02 TeV...","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.166083.v1/t7","@type":"Dataset","description":"Dielectron pair DCA spectrum for $1.2 &lt; m_{\\rm ee} &lt; 2.6$ GeV/$c^{2}$ in Pb--Pb collisions at $\\sqrt{s_{NN}}$ = 5.02 TeV...","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.166083.v1/t8","@type":"Dataset","description":"Direct photon fraction as a function of $p_{\\rm T}$ in Pb--Pb collisions at $\\sqrt{s_{NN}}$ = 5.02 TeV for the 0--10\\%...","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.166083.v1/t9","@type":"Dataset","description":"Direct photon $p_{\\rm T}$ spectrum in Pb--Pb collisions at $\\sqrt{s_{NN}}$ = 5.02 TeV for the 0--10\\% centrality class.","name":"Table 9"},{"@id":"https://doi.org/10.17182/hepdata.166083.v1/t10","@type":"Dataset","description":"Direct photon dN/dy in Pb--Pb collisions at $\\sqrt{s_{NN}}$ = 5.02 TeV for the 0--10\\% centrality class.","name":"Table 10"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2693299?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/166083"}],"inLanguage":"en","name":"Dielectron production in central Pb$-$Pb collisions at $\\sqrt{s_\\mathrm{NN}}$ = 5.02 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2693299?version=1","version":1}