First Direct Observation of Collider Neutrinos with FASER at the LHC

• DOI: 10.48550/arxiv.2303.14185
• Publication Date: 2023-01-01
• Authors: FASER Collaboration; H. Abreu; J. K. Anders; C. Antel; A. Ariga; T. Ariga; Jeremy Atkinson; F. U. Bernlochner; Tobias Blesgen; Tobias Boeckh; Jamie Boyd; L. Brenner; F. Cadoux; D. Casper; Charlotte Cavanagh; X. Chen; A. Coccaro; Ansh Desai; Sergey Dmitrievsky; M. D’Onofrio; Yannick Favre; D. E. Fellers; Jonathan L. Feng; Carlo Alberto Fen...; D. Ferrère; S. M. Gibson; S. González-Sevilla; Y. Gornushkin; C. B. Gwilliam; D. Hayakawa; S.‐C. Hsu; Z. Hu; G. Iacobucci; Tomohiro Inada; S. Jakobsen; Hans Ludwig Joos; E. Kajomovitz; H. Kawahara; Alex Keyken; Felix Kling; Daniela Köck; U. Köse; Rafaella Kotitsa; S. Kuehn; H. P. Lefebvre; L. J. Levinson; K. Li; Jinfeng Liu; Jack MacDonald; Chiara Magliocca; Fulvio Martinelli; J. A. Mcfayden; Matteo Milanesio; D. Mladenov; Théo Moretti; Magdalena Münker; Mitsuhiro Nakamura; Toshiyuki Nakano; M. Nessi; F. Neuhaus; Laurie Nevay; H. Otono; H. Pang; L. Paolozzi; Brian Petersen; F. Pietropaolo; M. T. Prim; M. Queitsch-Maitland; F. Resnati; Hiroki Rokujo; Elisa Ruiz-Chóliz; Jorge Sabater-Igl...; Osamu Sato; P. Scampoli; K. Schmieden; M. Schott; A. Sfyrla; Savannah Shively; Y. Takubo; Noshin Tarannum; O. Theiner; E. Torrence; S. Tufanli; S. Vasina; B. Vormwald; Di Wang; Eli Welch; S. Zambito
• Keywords: Neutrino astronomy; Solar neutrino problem

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