Observation of Collider Neutrinos without Final State Muons with the SND@LHC Experiment

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Abstract
We report the observation of neutrino interactions without final state muons at the LHC, with a significance of 6.4 σ . A dataset of proton-proton collisions at s = 13.6 TeV collected by SND@LHC in 2022 and 2023 is used, corresponding to an integrated luminosity of 68.6 fb − 1 . Neutrino interactions without a reconstructed muon are selected, resulting in an event sample consisting mainly of neutral-current and electron neutrino charged-current interactions in the detector. After selection cuts, 9 neutrino interaction candidate events are observed with an estimated background of 0.32 events.
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Funding Information
  • CERN
  • Ministry of Education and Science
  • Deutsche Forschungsgemeinschaft (496466340)
  • Instituto Nazionale di Fisica Nucleare
  • Japan Society for the Promotion of Science
  • Ministry of Education, Culture, Sports, Science and Technology
  • Nagoya University
  • Promotion and Mutual Aid Corporation for Private Schools of Japan
  • National Research Foundation of Korea (2021R1A2C2011003, 2020R1A2C1099546, 2021R1F1A1061717, 2022R1A2C100505)
  • Fundação para a Ciência e a Tecnologia (CERN/FIS-INS/0028/2021, CEECIND/01334/2018, CEECINST/00032/2021, PRT/BD/153351/2021)
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
  • Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu (2022TENMAK(CERN) A5.H3.F2-1)
  • European Commission
  • NextGenerationEU
  • ICSC—Centro Nazionale di Ricerca in High-Performance-Computing, Big Data and Quantum Computing

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