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@ARTICLE{Acharya:364028,
      author       = {Acharya, Shreyasi and others},
      title        = {{D}ielectron production in central {P}b-{P}b collisions at
                      $\sqrt{s_{{NN}}}$ = 5.02{T}e{V}},
      journal      = {Physical review / C},
      volume       = {112},
      number       = {5},
      issn         = {2469-9985},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {GSI-2026-00211, arXiv:2308.16704. CERN-EP-2023-194},
      pages        = {054906},
      year         = {2025},
      note         = {Published by the American Physical Society under the terms
                      of the Creative Commons Attribution 4.0 International
                      license.},
      abstract     = {The first measurement of the e$^+$e$^−$ pair production
                      at midrapidity and low invariant mass in central Pb-Pb
                      collisions at $\sqrt{s_{NN}}$=5.02TeV at the Large Hadron
                      Collider is presented. The yield of e$^+$e$^−$ pairs is
                      compared with a cocktail of expected hadronic decay
                      contributions in the invariant mass (m$_{ee}$) and pair
                      transverse momentum ($p_{T,ee}$) ranges m$_{ee}$ < 3.5
                      GeV/c$^2$ and p$_{T,ee}$ <8 GeV/c. For 0.18 < m$_{ee}$ < 0.5
                      GeV/c$^2$ the ratio of data to the cocktail of hadronic
                      contributions amounts to
                      1.40±0.11(stat.)±0.23(syst.)±0.16(cocktail) and
                      1.42±0.11(stat.)±0.23(syst.)−0.29+0.24(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$_{ee}$ < 2.6 GeV/c$^2$), the pair transverse
                      impact parameter of the e$^+$e$^−$ pairs (DCAee, where
                      “DCA” denotes “distance of closest approach”) 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 $c\bar{c}$ and an additional prompt
                      component. Finally, the first direct-photon measurement in
                      the 10\% most central Pb-Pb collisions at $\sqrt{s_{NN}}$ =
                      5.02TeV is reported via the study of virtual direct photons
                      in the transverse momentum range 1 < p$_T$ < 5 GeV/c. A
                      model including prompt photons, as well as photons from the
                      preequilibrium and fluid-dynamic phases, can reproduce the
                      result, while being at the upper edge of the data
                      uncertainties.},
      keywords     = {photon: direct production (INSPIRE) / hadron: decay
                      (INSPIRE) / vertex: primary (INSPIRE) / matter: effect
                      (INSPIRE) / GeV (INSPIRE) / TeV (INSPIRE) / thermal
                      (INSPIRE) / transverse momentum (INSPIRE) / heavy quark
                      (INSPIRE) / pair production (INSPIRE) / meson (INSPIRE) /
                      hadronic decay (INSPIRE) / transverse (INSPIRE) / CERN LHC
                      Coll (INSPIRE) / background (INSPIRE) / suppression
                      (INSPIRE) / impact parameter (INSPIRE) / lead (INSPIRE) /
                      hadronic (INSPIRE) / electron positron (INSPIRE) / charm
                      (INSPIRE) / hydrodynamics (INSPIRE) / quark gluon: plasma
                      (INSPIRE) / PHENIX (INSPIRE) / quantum chromodynamics
                      (INSPIRE)},
      cin          = {ALI / DTL / CIT / EXM / ALICE@CERN},
      ddc          = {530},
      cid          = {I:(DE-Ds200)ALI-20080822OR105 /
                      I:(DE-Ds200)DTL-20051214OR031 /
                      I:(DE-Ds200)CIT-20110310OR121 /
                      I:(DE-Ds200)EXM-20080818OR100 / I:(DE-Ds200)Coll-CERN-ALICE},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF4-612) / HGS-HIRe
                      - HGS-HIRe for FAIR (HGS-HIRe) / SUC-GSI-Heidelberg -
                      Strategic university cooperation GSI-U Heidelberg
                      (SUC-GSI-HE) / SUC-GSI-Frankfurt - Strategic university
                      cooperation GSI-U Frankfurt/M (SUC-GSI-FR) /
                      SUC-GSI-Darmstadt - Strategic university cooperation GSI-TU
                      Darmstadt (SUC-GSI-DA) / STRONG-2020 - The strong
                      interaction at the frontier of knowledge: fundamental
                      research and applications (824093)},
      pid          = {G:(DE-HGF)POF4-612 / G:(DE-Ds200)HGS-HIRe /
                      G:(DE-Ds200)SUC-GSI-HE / G:(DE-Ds200)SUC-GSI-FR /
                      G:(DE-Ds200)SUC-GSI-DA / G:(EU-Grant)824093},
      experiment   = {EXP:(DE-H253)LHC-Exp-ALICE-20150101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2308.16704},
      howpublished = {arXiv:2308.16704},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2308.16704;\%\%$},
      doi          = {10.1103/xl6m-vbqk},
      url          = {https://repository.gsi.de/record/364028},
}