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@ARTICLE{Kling:644562,
      author       = {Kling, Felix and Reimitz, Peter and Ritz, Adam},
      title        = {{D}ark {V}ector {B}oson {B}remsstrahlung: {N}ew {F}orm
                      {F}actors for a {B}roader {C}lass of {M}odels},
      reportid     = {PUBDB-2026-00404, arXiv:2509.09437. UCI-TR-2025-16},
      year         = {2026},
      abstract     = {We explore the sensitivity of collider experiments to a
                      broad class of GeV-scale dark vector models of new physics
                      via production in proton and neutron bremsstrahlung and
                      initial state radiation. This is achieved using a new
                      physically motivated model for timelike vector form factors
                      with generic charges for both protons and neutrons, which is
                      fit to a variety of timelike and spacelike data with
                      quantified uncertainties. The production model for both
                      proton and neutron bremsstrahlung is applied to re-cast and
                      extend the reach of existing FASER data to GeV-mass dark
                      photons, $U(1)_B,$ $U(1)_{B-L},$ and photophobic vectors, as
                      well as forecasts for millicharged particles at FORMOSA.},
      cin          = {T},
      ddc          = {530},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / DFG
                      project G:(GEPRIS)390833306 - EXC 2121: Das Quantisierte
                      Universum II (390833306)},
      pid          = {G:(DE-HGF)POF4-611 / G:(GEPRIS)390833306},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      url          = {https://bib-pubdb1.desy.de/record/644562},
}