QCD opportunities with forward neutrinos during the HL-LHC phase

Several pilot experiments have been proposed and/or are already under construction, capable of exploiting forward beams of neutrinos produced in $pp$ collisions at the LHC, that propagate towards detectors located at several hundred meters from the interaction point. These experiments are equipped with detectors where interaction cross-sections of these highly energetic neutrinos are measured. The possibility of increasing the size of these detectors and building a Forward Physics Facility capable of hosting a number of them during the High Luminosity phase of LHC is currently under investigation. I focus on the QCD opportunities offered by such a possibility, in particular I show how measuring the fluxes and composition of the neutrino beams and their interactions at the detector site offers unique opportunities to constrain various non-perturbative QCD aspects, in the hypothesis that new-physics particles do not play a relevant role in the production, propagation and interaction of these neutrinos.