Preprint

PUBDB-2025-01176

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Prospects and Opportunities with an upgraded FASER Neutrino Detector during the HL-LHC era: Input to the EPPSU

Mammen Abraham, R. ; Ai, X. ; Alonso-Monsalve, S. ; Anders, J. ; Antel, C. ; Ariga, A. ; Ariga, T. ; Atkinson, J. ; Bernlochner, F. U. ; Boeckh, T. ; Boyd, J. ; Brenner, L. ; Burger, A. ; Cadoux, F. ; Cardella, R. ; Casper, D. W. ; Cavanagh, C. ; Chen, X. ; Chouhan, D. ; Christiano, S. ; Coccaro, A. ; Débieux, S. ; D'Onofrio, M. ; Desai, A. ; Dmitrievsky, S. ; Dobre, R. ; Eley, S. ; Favre, Y. ; Feng, J. L. ; Fenoglio, C. A. ; Ferrere, D. ; Fieg, M. ; Filali, W. ; Firu, E. ; Galantay, E. ; Garabaglu, A. ; Gibson, S. ; Gonzalez-Sevilla, S. ; Gornushkin, Y. ; Gwilliam, C. ; Hayakawa, D. ; Holzbock, M. ; Hsu, S.-C. ; Hu, Z. ; Iacobucci, G. ; Inada, T. ; Iodice, L. ; Jakobsen, S. ; Joos, H. ; Kajomovitz, E. ; Kawahara, H. ; Keyken, A. ; Kling, F.DESY* ; Köck, D. ; Kontaxakis, P. ; Kose, U. ; Kotitsa, R. ; Krack, P. ; Kuehn, S. ; Kugathasan, T. ; Levinson, L. ; Li, B. ; Liu, J. ; Liu, Y. ; Lutz, M. S. ; MacDonald, J. ; Magliocca, C. ; Mäkelä, T. ; Maruya, Y. ; McCoy, L. ; McFayden, J. ; Medina, A. P. ; Milanesio, M. ; Moretti, T. ; Nakamura, M. ; Nakano, T. ; Nevay, L. ; Ohashi, K. ; Otono, H. ; Pang, H. ; Paolozzi, L. ; Pawan, P. ; Petersen, B. ; Preda, T. ; Prim, M. ; Queitsch-Maitland, M. ; Rojo, J. ; Rokujo, H. ; Rubbia, A. ; Sabater-Iglesias, J. ; Sato, O. ; Scampoli, P. ; Schmieden, K. ; Schott, M. ; Sfyrla, A. ; Sgalaberna, D. ; Shamim, M. ; Shively, S. ; Takubo, Y. ; Tarannum, N. ; Theiner, O. ; Thor, S. ; Torrence, E. ; Valdes Martinez, O. I. ; Vasina, S. ; Vormwald, B. ; Wang, Y. ; Welch, E. ; Wielers, M. ; Wilson, B. J. ; Wu, J. ; Wuthrich, J. M. ; Xu, Y. ; Zahorec, S. ; Zambito, S. ; Zhang, S. ; Zhao, X. ; FASER Collaboration (Collaboration author)

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-01176

Report No.: CERN-FASER-2025-001; DESY-25-058; arXiv:2503.19775

Abstract: The FASER experiment at CERN has opened a new window in collider neutrino physics by detecting TeV-energy neutrinos produced in the forward direction at the LHC. Building on this success, this document outlines the scientific case and design considerations for an upgraded FASER neutrino detector to operate during LHC Run 4 and beyond. The proposed detector will significantly enhance the neutrino physics program by increasing event statistics, improving flavor identification, and enabling precision measurements of neutrino interactions at the highest man-made energies. Key objectives include measuring neutrino cross sections, probing proton structure and forward QCD dynamics, testing lepton flavor universality, and searching for beyond-the-Standard Model physics. Several detector configurations are under study, including high-granularity scintillator-based tracking calorimeters, high-precision silicon tracking layers, and advanced emulsion-based detectors for exclusive event reconstruction. These upgrades will maximize the physics potential of the HL-LHC, contribute to astroparticle physics and QCD studies, and serve as a stepping stone toward future neutrino programs at the Forward Physics Facility.

Keyword(s): High Energy Physics - Experiment (hep-ex) ; Instrumentation and Detectors (physics.ins-det) ; FOS: Physical sciences

Note: Contribution prepared for the 2025 update of the European Strategy for Particle Physics, arXiv only

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe (390833306) (390833306)

Experiment(s):

1. LHC: Other

Appears in the scientific report 2025

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