Physics with TeV Neutrinos from the LHC
by
Proton-proton collisions at the LHC produce an immense flux of high-energy (up to several TeV) neutrinos along the beam (forward) direction. The breakthrough observation of LHC neutrinos by FASER and SND@LHC in March 2023 heralds a new era in particle physics. In this talk I present the unprecedented reach of current (FASER, SND@LHC) and future (FASER2, AdvSND, FLArE) forward LHC neutrino experiments for studies of SM and BSM physics, focusing on their impact for QCD and neutrino physics. I demonstrate that these experiments effectively extend the CERN infrastructure with an Neutrino-Ion Collider, enabling novel opportunities to pin down hadronic structure, opening a window to the gluon content of the proton in regions outside the coverage of any other experiment, and providing the first laboratory-based validation of cross-sections relevant for high-energy astroparticle studies.