Papers › FASER's Physics Reach for Long-Lived Particles
FASER's Physics Reach for Long-Lived Particles
FASER Collaboration, Akitaka Ariga, Tomoko Ariga, Jamie Boyd, Franck Cadoux, David W. Casper, Yannick Favre, Jonathan L. Feng, Didier Ferrere, Iftah Galon, Sergio Gonzalez-Sevilla, Shih-Chieh Hsu, Giuseppe Iacobucci, Enrique Kajomovitz, Felix Kling, Susanne Kuehn, Lorne Levinson, Hidetoshi Otono, Brian Petersen, Osamu Sato, Matthias Schott, Anna Sfyrla, Jordan Smolinsky, Aaron M. Soffa, Yosuke Takubo, Eric Torrence, Sebastian Trojanowski, Gang Zhang
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FASER,the ForwArd Search ExpeRiment,is a proposed experiment dedicated to searching for light, extremely weakly-interacting particles at the LHC. Such particles may be produced in the LHC's high-energy collisions and travel long distances through concrete and rock without interacting. They may then decay to visible particles in FASER, which is placed 480 m downstream of the ATLAS interaction point. In this work we briefly describe the FASER detector layout and the status of potential backgrounds. We then present the sensitivity reach for FASER for a large number of long-lived particle models, updating previous results to a uniform set of detector assumptions, and analyzing new models. In particular, we consider all of the renormalizable portal interactions, leading to dark photons, dark Higgs bosons, and heavy neutral leptons (HNLs); light B-L and Lᵢ - Lⱼ gauge bosons; axion-like particles (ALPs) that are coupled dominantly to photons, fermions, and gluons through non-renormalizable operators; and pseudoscalars with Yukawa-like couplings. We find that FASER and its follow-up, FASER 2, have a full physics program, with discovery sensitivity in all of these models and potentially far-reaching implications for particle physics and cosmology.
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