FASER: ForwArd Search ExpeRiment at the LHC
Abstract
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 in large numbers in the far-forward region and then 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 describe the FASER program. In its first stage, FASER is an extremely compact and inexpensive detector, sensitive to decays in a cylindrical region of radius R = 10 cm and length L = 1.5 m. FASER is planned to be constructed and installed in Long Shutdown 2 and will collect data during Run 3 of the 14 TeV LHC from 2021-23. If FASER is successful, FASER 2, a much larger successor with roughly R ~ 1 m and L ~ 5 m, could be constructed in Long Shutdown 3 and collect data during the HL-LHC era from 2026-35. FASER and FASER 2 have the potential to discover dark photons, dark Higgs bosons, heavy neutral leptons, axion-like particles, and many other long-lived particles, as well as provide new information about neutrinos, with potentially far-ranging implications for particle physics and cosmology. We describe the current status, anticipated challenges, and discovery prospects of the FASER program.
Cite
@article{arxiv.1901.04468,
title = {FASER: ForwArd Search ExpeRiment at the LHC},
author = {FASER Collaboration and Akitaka Ariga and Tomoko Ariga and Jamie Boyd and Franck Cadoux and David W. Casper and Yannick Favre and Jonathan L. Feng and Didier Ferrere and Iftah Galon and Sergio Gonzalez-Sevilla and Shih-Chieh Hsu and Giuseppe Iacobucci and Enrique Kajomovitz and Felix Kling and Susanne Kuehn and Lorne Levinson and Hidetoshi Otono and Brian Petersen and Osamu Sato and Matthias Schott and Anna Sfyrla and Jordan Smolinsky and Aaron M. Soffa and Yosuke Takubo and Eric Torrence and Sebastian Trojanowski and Gang Zhang},
journal= {arXiv preprint arXiv:1901.04468},
year = {2019}
}
Comments
13 pages, 4 figures, submitted as Input to the European Particle Physics Strategy Update 2018-2020 and draws on FASER's Letter of Intent, Technical Proposal, and physics case documents (arXiv:1811.10243, arXiv:1812.09139, and arXiv:1811.12522)