Technical Proposal for FASER: ForwArd Search ExpeRiment at the LHC

Abstract

FASER is a proposed small and inexpensive experiment designed to search for light, weakly-interacting particles during Run 3 of the LHC from 2021-23. Such particles may be produced in large numbers along the beam collision axis, travel for hundreds of meters without interacting, and then decay to standard model particles. To search for such events, FASER will be located 480 m downstream of the ATLAS IP in the unused service tunnel TI12 and be sensitive to particles that decay in a cylindrical volume with radius R=10 cm and length L=1.5 m. FASER will complement the LHC's existing physics program, extending its discovery potential to a host of new, light particles, with potentially far-reaching implications for particle physics and cosmology. This document describes the technical details of the FASER detector components: the magnets, the tracker, the scintillator system, and the calorimeter, as well as the trigger and readout system. The preparatory work that is needed to install and operate the detector, including civil engineering, transport, and integration with various services is also presented. The information presented includes preliminary cost estimates for the detector components and the infrastructure work, as well as a timeline for the design, construction, and installation of the experiment.

arXiv comment82 pages, 62 figures; submitted to the CERN LHCC on 7 November 2018

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• Forward Neutrino Fluxes at the LHC
• Ultra-High-Energy Cosmic Rays: The Intersection of the Cosmic and Energy Frontiers
• Direct detection and complementary constraints for sub-GeV dark matter
• Cosmology Intertwined I: Perspectives for the Next Decade
• FORESEE: FORward Experiment SEnsitivity Estimator for the LHC and future hadron colliders
• Event Generators for High-Energy Physics Experiments
• Detecting Dark Matter with Far-Forward Emulsion and Liquid Argon Detectors at the LHC
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• Dark Sector Production via Proton Bremsstrahlung
• Physics Potential of an Experiment using LHC Neutrinos
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• An explanation of the muon puzzle of ultrahigh-energy cosmic rays and the role of the Forward Physics Facility for model improvement
• Hadrophilic Dark Sectors at the Forward Physics Facility
• The tracking detector of the FASER experiment
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• Enhanced long-lived dark photon signals at lifetime frontier detectors
• Shedding Flavor on Dark via Freeze-in: $U(1{)}_{B-3L_i}$ Gauged Extensions
• Gamma Factory Searches for Extremely Weakly-Interacting Particles
• Neutrino Detection without Neutrino Detectors: Discovering Collider Neutrinos at FASER with Electronic Signals Only
• Oscillations of sterile neutrinos from dark matter decay eliminates the IceCube-Fermi tension
• Neutrino Experiments at the Large Hadron Collider
• Explaining $g_{\mu }-2$ and $R_{K^{(\ast )}}$ using the light mediators of $U(1{)}_{T3R}$
• Measurements and analysis of different front-end configurations for monolithic SiGe BiCMOS pixel detectors for HEP applications
• Sensitivities to feebly interacting particles: public and unified calculations
• The new monolithic ASIC of the preshower detector for di-photon measurements in the FASER experiment at CERN