Electromagnetic shower reconstruction and identification in FASER's emulsion detector for LHC forward neutrino measurements
Year: 2026
Type: article
Abstract: We present methods for electromagnetic shower reconstruction and identification in the FASERν emulsion detector using 100 GeV and 200 GeV electron test-beam data from the CERN SPS H4 beamline. The reconstruction employs a clustering-based algorithm without energy-dependent tuning to determine shower axes. A multi-level identification chain comprising track pre-selection, a cut-based selection, and a BDT classifier achieves combined background rejection rates of 99.99% (100 GeV) and 99.94% (200 GeV). The method reaches total reconstruction and identification efficiencies of 58.9% (100 GeV) and 70.8% (200 GeV) evaluated from simulated samples. Energy reconstruction using the total number of reconstructed segments as the calorimetric estimator yields relative biases of +0.6% (100 GeV) and -0.8% (200 GeV), with resolutions of 25.4% and 22.6%, respectively. Systematic uncertainties on the energy reconstruction are dominated by variations in emulsion film detection efficiency, with totals of +10.9 -8.2 % at 100 GeV and +10.3 -6.9 % at 200 GeV. The methodology provides a validated framework for electron neutrino identification with the FASER ν detector at the LHC.
Source: Journal of Instrumentation
Authors: Roshan Mammen Abraham, Xiaocong Ai, Saul Alonso Monsalve, John Anders, Emma Kate Anderson, Akitaka Ariga, Tomoko Ariga, Jeremy Atkinson, Florian U. Bernlochner, Jianming Bian, Tobias Boeckh, Eliot Bornand, Jamie Boyd, Lydia Brenner, Angela Burger, Franck Cadoux, Roberto Cardella, David W. Casper, Charlotte Cavanagh, Shiyang Chen, Xin Chen, Xing Cheng, Dhruv Chouhan, Andrea Coccaro, Fabio Cufino, Stephane Débieux, Ansh Desai, Sergey Dmitrievsky, Radu Dobre, Monica D'Onofrio, Sinead Eley, Yannick Favre, Jonathan L. Feng, Carlo Alberto Fenoglio, Didier Ferrere, Max Fieg, Wissal Filali, Elena Firu, Haruhi Fujimori, Edward Galantay, Stephen Gibson, Sergio Gonzalez-Sevilla, Yuri Gornushkin, Yotam Granov, Jinjing Gu, Carl Gwilliam, Elie Hammou, Daiki Hayakawa, Michael Holzbock, Shih-Chieh Hsu, Zhen Hu, Giuseppe Iacobucci, Tomohiro Inada, Luca Iodice, Sune Jakobsen, Cesar Jesus-Valls, Arash Jofrehei, Hans Joos, Enrique Kajomovitz, Alex Keyken, Felix Kling, Daniela Köck, Pantelis Kontaxakis, Jelle Koorn, Umut Kose, Peter Krack, Susanne Kuehn, Thanushan Kugathasan, Sebastian Laudage, Lorne Levinson, Botao Li, Jiaxi Liu, Jinfeng Liu, Yi Liu, Margaret S. Lutz, Joern Mahlstedt, Toni Mäkelä, Yasuhiro Maruya, Anna Mascellani, Lawson McCoy, Josh McFayden, Andrea Pizarro Medina, Hiroaki Menjo, Théo Moretti, Toshiyuki Nakano, Laurie Nevay, Yuma Ohara, Ken Ohashi, Hidetoshi Otono, Lorenzo Paolozzi, Annabelle Parry, Pawan Pawan, Brian Petersen, Titi Preda, Markus Prim, Junkai Qin, Michaela Queitsch-Maitland, Juan Rojo, Hiroki Rokujo, André Rubbia, Osamu Sato, Paola Scampoli, Kristof Schmieden, Matthias Schott, Cristiano Sebastiani, Anna Sfyrla, Davide Sgalaberna, Mansoora Shamim, Yosuke Takubo, Kakeru Tanaka, Noshin Tarannum, Simon Thor, Eric Torrence, Serhan Tufanli, Oscar Ivan Valdes Martinez, Svetlana Vasina, Emanuele Villa, Benedikt Vormwald, Chi Wang, Yuxiao Wang, Eli Welch, Aaron White, Monika Wielers, Benjamin James Wilson, Zhongyi Wu, Yue Xu, Heng Yang, Lekai Yao, Daichi Yoshikawa, Stefano Zambito, Shunliang Zhang, Yuxuan Zhang, Xingyu Zhao, Zijian Zhao
Institutions: University of California, Irvine, Zhengzhou University, ETH Zurich, University of Liverpool, European Organization for Nuclear Research, University of Bern, Chiba University, Kyushu University, University of Bonn, University of Geneva, National Institute for Subatomic Physics, Centre National de la Recherche Scientifique, Université Toulouse III - Paul Sabatier, Institut National de Physique Nucléaire et de Physique des Particules, Université de Toulouse, Tsinghua University, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, University of Oregon, National Institute for Laser Plasma and Radiation Physics, Institute of Space Science - INFLPR Subsidiary, Fermi National Accelerator Laboratory, Royal Holloway University of London, Technion – Israel Institute of Technology, University of Washington, Weizmann Institute of Science, University of Sussex, Nagoya University, University of Manchester, University of Naples Federico II, National Institute of Technology, Niihama College, Rutherford Appleton Laboratory
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,290
Funders: CERN, Deutsche Forschungsgemeinschaft, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, National Natural Science Foundation of China, Tsinghua University, Japan Society for the Promotion of Science, Institute of Materials and Systems for Sustainability, Nagoya University
OpenAlex ID: W7165168694