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@MISC{Collaboration:348442,
      author       = {{ALICE Collaboration}},
      title        = {{D}ielectron production at midrapidity at low transverse
                      momentum in peripheral and semi-peripheral {P}b$-${P}b
                      collisions at $\sqrt{s_{\rm {NN}}} = 5.02$ {T}e{V}},
      reportid     = {GSI-2024-00278},
      year         = {2022},
      note         = {Journal Article GSI record: GSI-2024-00277},
      abstract     = {The first measurement of the $e^+e^-$ pair production at
                      low lepton pair transverse momentum ($P_{T,ee}$) and low
                      invariant mass ($m_{ee}$) in non-central Pb$-$Pb collisions
                      at $\sqrt{s_{NN}}=5.02$ TeV at the LHC is presented. The
                      dielectron production is studied with the ALICE detector at
                      midrapidity ($|\eta_e| < 0.8$) as a function of invariant
                      mass ($0.4 \leq m_{ee} < 2.7$ GeV/$c$) in the 50-70\% and
                      70-90\% centrality classes for $P_{T,ee} < 0.1$ GeV/$c$, and
                      as a function of $P_{T,ee}$ in three intervals in the most
                      peripheral Pb-Pb collisions. Below a $P_{T,ee}$ of 0.1
                      GeV/$c$, a clear excess of $e^+e^-$ pairs is found compared
                      to the expectations from known hadronic sources and
                      predictions of thermal radiation from the medium. The
                      $m_{ee}$ excess spectra are reproduced, within
                      uncertainties, by different predictions of the photonphoton
                      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 $P_{T,ee}$ spectra. The measured
                      $\sqrt{< P^2_{T,ee} >}$ of the excess spectrum in peripheral
                      Pb-Pb collisions is found to be comparable to the values
                      observed previously at RHIC in a similar phase-space region},
      cin          = {ALI / DTL / CIT / EXM / ALICE@CERN},
      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)},
      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},
      experiment   = {EXP:(DE-H253)LHC-Exp-ALICE-20150101},
      typ          = {PUB:(DE-HGF)32},
      doi          = {10.17182/HEPDATA.134246},
      url          = {https://repository.gsi.de/record/348442},
}