First Measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>ν</mml:mi><mml:mi>e</mml:mi></mml:msub></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>ν</mml:mi><mml:mi>μ</mml:mi></mml:msub></mml:math> Interaction Cross Sections at the LHC with FASER’s Emulsion Detector
Roshan Mammen Abraham, John Anders, Claire Antel, A. Ariga, T. Ariga, Jeremy Atkinson, F. U. Bernlochner, Tobias Boeckh, Jamie Boyd, Lydia Brenner, A. M. Burger, F. Cadoux, R. Cardella, D. Casper, Charlotte Cavanagh, Xin Chen, A. Coccaro, Stephane Debieux, Monica D’Onofrio, Ansh Desai, Sergey Dmitrievsky, Sinead Eley, Yannick Favre, D. E. Fellers, Jonathan L. Feng, Carlo Alberto Fenoglio, D. Ferrère, Max Fieg, Wissal Filali, Haruhi Fujimori, Ali Garabaglu, S. M. Gibson, S. González-Sevilla, Y. Gornushkin, C. B. Gwilliam, D. Hayakawa, Shih-Chieh Hsu, Z. Hu, G. Iacobucci, Tomohiro Inada, Luca Iodice, S. Jakobsen, Hans Ludwig Joos, E. Kajomovitz, Takumi Kanai, H. Kawahara, Alex Keyken, Felix Kling, Daniela Kock, Pantelis Kontaxakis, U. Köse, Rafaella Kotitsa, Susanne Kuehn, T. Kugathasan, Helena Lefebvre, Lorne Levinson, Ke Li, Jinfeng Liu, Margaret S. Lutz, J. C. MacDonald, Chiara Magliocca, Fulvio Martinelli, Lawson McCoy, J. A. Mcfayden, Andrea Pizarro Medina, Matteo Milanesio, Théo Moretti, Magdalena Münker, Mitsuhiro Nakamura, Toshiyuki Nakano, F. Neuhaus, Laurie Nevay, Motoya Nonaka, K Okui, Ken Ohashi, Hidetoshi Otono, Hao Pang, Lorenzo Paolozzi, Brian Petersen, M. T. Prim, M. Queitsch-Maitland, Hiroki Rokujo, Elisa Ruiz-Chóliz, André Rubbia, Jorge Sabater-Iglesias, Osamu Sato, Paola Scampoli, Kristof Schmieden, Matthias Schott, A. Sfyrla, Mansoora Shamim, Savannah Shively, Y. Takubo, Noshin Tarannum, Ondrej Theiner, E. Torrence, Svetlana Vasina, B. Vormwald, D. Wang, Yuxiao Wang
Abstract
The first results of the study of high-energy electron neutrino (ν_{e}) and muon neutrino (ν_{μ}) charged-current interactions in the FASERν emulsion-tungsten detector of the FASER experiment at the LHC are presented. A 128.8 kg subset of the FASERν volume was analyzed after exposure to 9.5 fb^{-1} of sqrt[s]=13.6 TeV pp data. Four (eight) ν_{e} (ν_{μ}) interaction candidate events are observed with a statistical significance of 5.2σ (5.7σ). This is the first direct observation of ν_{e} interactions at a particle collider and includes the highest-energy ν_{e} and ν_{μ} ever detected from an artificial source. The interaction cross section per nucleon σ/E_{ν} is measured over an energy range of 560-1740 GeV (520-1760 GeV) for ν_{e} (ν_{μ}) to be (1.2_{-0.7}^{+0.8})×10^{-38} cm^{2} GeV^{-1} [(0.5±0.2)×10^{-38} cm^{2} GeV^{-1}], consistent with standard model predictions. These are the first measurements of neutrino interaction cross sections in those energy ranges.