The FASER detector
H. Abreu, Elham Amin Mansour, C. Antel, A. Ariga, T. Ariga, F. U. Bernlochner, Tobias Boeckh, Jamie Boyd, L. Brenner, F. Cadoux, D. Casper, Charlotte Cavanagh, X. Chen, A. Coccaro, Olivier Crespo-Lopez, Stéphane Débieux, Sergey Dmitrievsky, M. D’Onofrio, Liam R. Dougherty, C. Dozen, Abdallah Ezzat, Yannick Favre, D. E. Fellers, Jonathan L. Feng, D. Ferrère, Edward Karl Galantay, J R Le Gall, E. Gamberini, S. M. Gibson, S. González-Sevilla, Y. Gornushkin, C. B. Gwilliam, D. Hayakawa, S.‐C. Hsu, Z. Hu, G. Iacobucci, Tomohiro Inada, S. Jakobsen, Eliott Johnson, E. Kajomovitz, H. Kawahara, Felix Kling, U. Köse, Rafaella Kotitsa, Jesse Krusse, S. Kuehn, H. P. Lefebvre, L. J. Levinson, Ke Li, Jinfeng Liu, Chiara Magliocca, Fulvio Martinelli, J. A. Mcfayden, Sam Meehan, Matteo Milanesio, Manato Miura, D. Mladenov, Théo Moretti, Magdalena Münker, Mitsuhiro Nakamura, Toshiyuki Nakano, M. Nessi, F. Neuhaus, Laurie Nevay, John Osborne, H. Otono, C. E. Pandini, Hao Pang, L. Paolozzi, Brian Petersen, F. Pietropaolo, M. T. Prim, M. Queitsch-Maitland, F. Resnati, C. Rizzi, Hiroki Rokujo, Elisa Ruiz-Chóliz, Jakob Salfeld-Nebgen, F. Sánchez Galán, Osamu Sato, P. Scampoli, K. Schmieden, M. Schott, A. Sfyrla, Savannah Shively, Roland Sipos, J. R. Spencer, Y. Takubo, Noshin Tarannum, O. Theiner, Pierre Thonet, E. Torrence, S. Tufanli, S. Vasina, Camille Vendeuvre, B. Vormwald, D. Wang, Stefano Zambito, Gang Zhang
Abstract
Abstract FASER, the ForwArd Search ExpeRiment, is an experiment dedicated to searching for light, extremely weakly-interacting particles at CERN's Large Hadron Collider (LHC). Such particles may be produced in the very forward direction of the LHC's high-energy collisions and then decay to visible particles inside the FASER detector, which is placed 480 m downstream of the ATLAS interaction point, aligned with the beam collisions axis. FASER also includes a sub-detector, FASER ν , designed to detect neutrinos produced in the LHC collisions and to study their properties. In this paper, each component of the FASER detector is described in detail, as well as the installation of the experiment system and its commissioning using cosmic-rays collected in September 2021 and during the LHC pilot beam test carried out in October 2021. FASER has successfully started taking LHC collision data in 2022, and will run throughout LHC Run 3.