The Forward Physics Facility at the High-Luminosity LHC
  High energy collisions at the High-Luminosity Large Hadron Collider (LHC)
produce a large number of particles along the beam collision axis, outside of
the acceptance of existing LHC experiments. The proposed Forward Physics
Facility (FPF), to be located several hundred meters from the ATLAS interaction
point and shielded by concrete and rock, will host a suite of experiments to
probe Standard Model (SM) processes and search for physics beyond the Standard
Model (BSM). In this report, we review the status of the civil engineering
plans and the experiments to explore the diverse physics signals that can be
uniquely probed in the forward region. FPF experiments will be sensitive to a
broad range of BSM physics through searches for new particle scattering or
decay signatures and deviations from SM expectations in high statistics
analyses with TeV neutrinos in this low-background environment. High statistics
neutrino detection will also provide valuable data for fundamental topics in
perturbative and non-perturbative QCD and in weak interactions. Experiments at
the FPF will enable synergies between forward particle production at the LHC
and astroparticle physics to be exploited. We report here on these physics
topics, on infrastructure, detector, and simulation studies, and on future
directions to realize the FPF's physics potential.
