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. 2023 Jul 21;131(3):031801.
doi: 10.1103/PhysRevLett.131.031801.

First Direct Observation of Collider Neutrinos with FASER at the LHC

Henso Abreu  1 , John Anders  2 , Claire Antel  3 , Akitaka Ariga  4   5 , Tomoko Ariga  6 , Jeremy Atkinson  4 , Florian U Bernlochner  7 , Tobias Blesgen  7 , Tobias Boeckh  7 , Jamie Boyd  2 , Lydia Brenner  8 , Franck Cadoux  3 , David W Casper  9 , Charlotte Cavanagh  10 , Xin Chen  11 , Andrea Coccaro  12 , Ansh Desai  13 , Sergey Dmitrievsky  14 , Monica D'Onofrio  10 , Yannick Favre  3 , Deion Fellers  13 , Jonathan L Feng  9 , Carlo Alberto Fenoglio  3 , Didier Ferrere  3 , Stephen Gibson  15 , Sergio Gonzalez-Sevilla  3 , Yuri Gornushkin  14 , Carl Gwilliam  10 , Daiki Hayakawa  5 , Shih-Chieh Hsu  16 , Zhen Hu  11 , Giuseppe Iacobucci  3 , Tomohiro Inada  11 , Sune Jakobsen  2 , Hans Joos  2   17 , Enrique Kajomovitz  1 , Hiroaki Kawahara  6 , Alex Keyken  15 , Felix Kling  18 , Daniela Köck  13 , Umut Kose  2 , Rafaella Kotitsa  2 , Susanne Kuehn  2 , Helena Lefebvre  15 , Lorne Levinson  19 , Ke Li  16 , Jinfeng Liu  11 , Jack MacDonald  20 , Chiara Magliocca  3 , Fulvio Martinelli  3 , Josh McFayden  21 , Matteo Milanesio  3 , Dimitar Mladenov  2 , Théo Moretti  3 , Magdalena Munker  3 , Mitsuhiro Nakamura  22 , Toshiyuki Nakano  22 , Marzio Nessi  2   3 , Friedemann Neuhaus  20 , Laurie Nevay  2   15 , Hidetoshi Otono  6 , Hao Pang  11 , Lorenzo Paolozzi  2   3 , Brian Petersen  2 , Francesco Pietropaolo  2 , Markus Prim  7 , Michaela Queitsch-Maitland  23 , Filippo Resnati  2 , Hiroki Rokujo  22 , Elisa Ruiz-Choliz  20 , Jorge Sabater-Iglesias  3 , Osamu Sato  22 , Paola Scampoli  4   24 , Kristof Schmieden  20 , Matthias Schott  20 , Anna Sfyrla  3 , Savannah Shively  9 , Yosuke Takubo  25 , Noshin Tarannum  3 , Ondrej Theiner  3 , Eric Torrence  13 , Serhan Tufanli  2 , Svetlana Vasina  14 , Benedikt Vormwald  2 , Di Wang  11 , Eli Welch  9 , Stefano Zambito  3 ; FASER Collaboration
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Free article

First Direct Observation of Collider Neutrinos with FASER at the LHC

Henso Abreu et al. Phys Rev Lett. .
Free article

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 dataset 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_{-13}^{+12} 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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