The Forward Physics Facility: Sites, Experiments, and Physics Potential
  The Forward Physics Facility (FPF) is a proposal to create a cavern with the
space and infrastructure to support a suite of far-forward experiments at the
Large Hadron Collider during the High Luminosity era. Located along the beam
collision axis and shielded from the interaction point by at least 100 m of
concrete and rock, the FPF will house experiments that will detect particles
outside the acceptance of the existing large LHC experiments and will observe
rare and exotic processes in an extremely low-background environment. In this
work, we summarize the current status of plans for the FPF, including recent
progress in civil engineering in identifying promising sites for the FPF and
the experiments currently envisioned to realize the FPF's physics potential. We
then review the many Standard Model and new physics topics that will be
advanced by the FPF, including searches for long-lived particles, probes of
dark matter and dark sectors, high-statistics studies of TeV neutrinos of all
three flavors, aspects of perturbative and non-perturbative QCD, and
high-energy astroparticle physics.
