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@ARTICLE{John:642926,
      author       = {John, Jukka and Kling, Felix and Koorn, Jelle and Krack,
                      Peter and Rojo, Juan},
      title        = {{A} first determination of the {LHC} neutrino fluxes from
                      {FASER} data},
      reportid     = {PUBDB-2025-05722, arXiv:2507.06022. UCI-TR-2025-14},
      year         = {2025},
      note         = {32 pages, 12 figures, code available from
                      https://github.com/LHCfitNikhef/nnfluxnu and
                      https://github.com/LHCfitNikhef/powheg-dis/tree/fktable},
      abstract     = {The detection of TeV neutrinos from the LHC by the
                      far-forward detectors FASER and SND@LHC enables a plethora
                      of novel physics opportunities. Among these, the measurement
                      of the flavour, energy, and rapidity dependence of the LHC
                      forward neutrino fluxes provides unique constraints on
                      theoretical predictions of forward particle production in
                      hadronic collisions. We demonstrate that neutrino event
                      yield measurements at FASER from Run 3 and at its HL-LHC
                      upgrades enable a theory-agnostic extraction of the LHC
                      forward neutrino fluxes. We exploit the equivalence of the
                      problem with the determination of parton distributions from
                      deep-inelastic structure functions to apply the NNPDF
                      approach, based on machine learning regression and the Monte
                      Carlo replica method, to LHC neutrino fluxes. The resulting
                      NNνflux methodology is validated through closure tests and
                      applied to a first extraction of the LHC muon neutrino flux
                      from the FASER 2024 data. We show how NNνflux can
                      discriminate between event generators of forward hadron
                      production; scrutinize a possible intrinsic charm component
                      in the proton; and constrain BSM scenarios with enhanced
                      decays of neutral hadrons into neutrinos.},
      keywords     = {Deep Inelastic Scattering or Small-x Physics (autogen) /
                      Neutrino Interactions (autogen) / Parton Distributions
                      (autogen)},
      cin          = {T},
      ddc          = {530},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611)},
      pid          = {G:(DE-HGF)POF4-611},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2507.06022},
      howpublished = {arXiv:2507.06022},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2507.06022;\%\%$},
      doi          = {10.3204/PUBDB-2025-05722},
      url          = {https://bib-pubdb1.desy.de/record/642926},
}