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@ARTICLE{Jorge:354884,
      author       = {Jorge, Adrian William Romero and Bratkovskaya, Elena and
                      Sagunski, Laura},
      title        = {{S}earch for dark photons in heavy-ion collisions},
      publisher    = {arXiv},
      reportid     = {GSI-2025-00004},
      year         = {2024},
      abstract     = {The vector $U$-bosons, or so called 'dark photons', are one
                      of the possible candidates for the dark matter mediators. We
                      present a procedure to derive theoretical constraints on the
                      upper limit of kinetic mixing parameter $ε^2(M_U)$ from
                      heavy-ion as well as $p+p$ and $p+A$ dilepton data from SIS
                      to LHC energies. Our study is based on the microscopic
                      Parton-Hadron-String Dynamics (PHSD) transport approach
                      which reproduces the measured dilepton spectra in $p+p$,
                      $p+A$ and $A+A$ collisions well. In addition to the
                      different dilepton channels originating from interactions
                      and decays of ordinary Standard Model matter particles
                      (mesons and baryons), we incorporate in the PHSD the decay
                      of hypothetical $U$-bosons to dileptons, $U \to e^+ e^-$,
                      where the $U$-bosons themselves are produced by the Dalitz
                      decay of pions, $η$-mesons, Delta resonances as well as by
                      vector meson and $K^+$ decays. This analysis provides the
                      upper limit on the $ε^2(M_U)$ and can also help to estimate
                      the requested accuracy for future experimental searches of
                      'light' dark photons by dilepton experiments.},
      keywords     = {High Energy Physics - Phenomenology (hep-ph) (Other) / FOS:
                      Physical sciences (Other)},
      cin          = {TES},
      cid          = {I:(DE-Ds200)TES-20160901OR397},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF4-612)},
      pid          = {G:(DE-HGF)POF4-612},
      experiment   = {$EXP:(DE-Ds200)no_experiment-20200803$},
      typ          = {PUB:(DE-HGF)25},
      doi          = {10.48550/ARXIV.2409.20141},
      url          = {https://repository.gsi.de/record/354884},
}