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000642926 005__ 20251221050245.0
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000642926 0247_ $$2arXiv$$aarXiv:2507.06022
000642926 0247_ $$2datacite_doi$$a10.3204/PUBDB-2025-05722
000642926 037__ $$aPUBDB-2025-05722
000642926 041__ $$aEnglish
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000642926 088__ $$2arXiv$$aarXiv:2507.06022
000642926 088__ $$2Other$$aUCI-TR-2025-14
000642926 1001_ $$00009-0000-1343-3460$$aJohn, Jukka$$b0
000642926 245__ $$aA first determination of the LHC neutrino fluxes from FASER data
000642926 260__ $$c2025
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000642926 500__ $$a32 pages, 12 figures, code available from https://github.com/LHCfitNikhef/nnfluxnu and https://github.com/LHCfitNikhef/powheg-dis/tree/fktable
000642926 520__ $$aThe detection of TeV neutrinos from the LHC by the far-forward detectors FASER and SND@LHC enables a plethora of novel physics opportunities. Among these, the measurement of the flavour, energy, and rapidity dependence of the LHC forward neutrino fluxes provides unique constraints on theoretical predictions of forward particle production in hadronic collisions. We demonstrate that neutrino event yield measurements at FASER from Run 3 and at its HL-LHC upgrades enable a theory-agnostic extraction of the LHC forward neutrino fluxes. We exploit the equivalence of the problem with the determination of parton distributions from deep-inelastic structure functions to apply the NNPDF approach, based on machine learning regression and the Monte Carlo replica method, to LHC neutrino fluxes. The resulting NNνflux methodology is validated through closure tests and applied to a first extraction of the LHC muon neutrino flux from the FASER 2024 data. We show how NNνflux can discriminate between event generators of forward hadron production; scrutinize a possible intrinsic charm component in the proton; and constrain BSM scenarios with enhanced decays of neutral hadrons into neutrinos.
000642926 536__ $$0G:(DE-HGF)POF4-611$$a611 - Fundamental Particles and Forces (POF4-611)$$cPOF4-611$$fPOF IV$$x0
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000642926 650_7 $$2autogen$$aDeep Inelastic Scattering or Small-x Physics
000642926 650_7 $$2autogen$$aNeutrino Interactions
000642926 650_7 $$2autogen$$aParton Distributions
000642926 693__ $$0EXP:(DE-MLZ)NOSPEC-20140101$$5EXP:(DE-MLZ)NOSPEC-20140101$$eNo specific instrument$$x0
000642926 7001_ $$0P:(DE-H253)PIP1097110$$aKling, Felix$$b1
000642926 7001_ $$00009-0003-5572-6618$$aKoorn, Jelle$$b2
000642926 7001_ $$0P:(DE-HGF)0$$aKrack, Peter$$b3$$eCorresponding author
000642926 7001_ $$00000-0003-4279-2192$$aRojo, Juan$$b4
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