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First Direct Observation of Collider Neutrinos with FASER at the LHC

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arxiv 2303.14185 v2 pith:OXXFQJC4 submitted 2023-03-24 hep-ex hep-ph

classification hep-exhep-ph
keywords neutrinocolliderfaserinteractionsobservationaboveconsistentdetector
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We report the first direct observation of neutrino interactions at a particle collider experiment. Neutrino candidate events are identified in a 13.6 TeV center-of-mass energy $pp$ collision data set of 35.4 fb${}^{-1}$ using the active electronic components of the FASER detector at the Large Hadron Collider. The candidates are required to have a track propagating through the entire length of the FASER detector and be consistent with a muon neutrino charged-current interaction. We infer $153^{+12}_{-13}$ neutrino interactions with a significance of 16 standard deviations above the background-only hypothesis. These events are consistent with the characteristics expected from neutrino interactions in terms of secondary particle production and spatial distribution, and they imply the observation of both neutrinos and anti-neutrinos with an incident neutrino energy of significantly above 200 GeV.

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Forward citations

Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. First Measurement of the Muon Neutrino Interaction Cross Section and Flux as a Function of Energy at the LHC with FASER

    hep-ex 2024-12 accept novelty 8.0 of 10

    First differential measurement of muon neutrino-nucleon cross section and flux in six TeV-scale energy bins using FASER at the LHC, with results consistent with Standard Model expectations.

  2. A New Source of Millicharged Particles: Secondary Showers in the LHC Forward Absorber

    hep-ph 2026-05 unverdicted novelty 7.0 of 10

    Secondary cascades in the TAXN absorber produce a substantial millicharged particle flux that complements primary production and boosts FORMOSA signals by ~50% for m_χ below 0.1 GeV.

  3. Non-Standard Neutrino Interactions at a Muon Collider Neutrino Detector

    hep-ph 2025-08 unverdicted novelty 6.0 of 10

    A forward neutrino detector at a muon collider can exceed current and upcoming bounds on non-standard neutrino interactions by exploiting high neutrino flux, known flavor composition, and chirality.

  4. A SHIFT of Perspective: Observing Neutrinos at CMS and ATLAS

    hep-ph 2025-10 conditional novelty 5.0 of 10

    A proposed LHC gas target would give CMS/ATLAS O(10^4) muon-neutrino and O(10^3) electron-neutrino interactions, opening forward hadron-production physics to neutrino detection.

  5. Lepton interactions from GeV to EeV

    hep-ph 2026-06 unverdicted novelty 3.0 of 10

    Phenomenological study predicting incomplete tau polarization at FASER2, observable neutrino and muon trident processes, and contributions to hadron structure from IceCube neutrino events.

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