Near-threshold production of \(W^\pm\), \(Z^0\), and \(H^0\) at a fixed-target experiment at the future ultrahigh-energy proton colliders (Q2363929)

Summary: We outline the opportunities to study the production of the Standard Model bosons, \(W^\pm\), \(Z^0\), and \(H^0\), at ''low'' energies at fixed-target experiments based on possible future ultrahigh-energy proton colliders, that is, the High-Energy LHC, the Super proton-proton Collider, and the Future Circular Collider hadron-hadron. These can be indeed made in conjunction with the proposed future colliders designed to reach up to \(\sqrt{s} = 100\)\ TeV by using bent crystals to extract part of the halo of the beam which would then impinge on a fixed target. Without disturbing the collider operation, this technique allows for the extraction of a substantial amount of particles in addition to serving for a beam-cleaning purpose. With this method, high-luminosity fixed-target studies at centre-of-mass energies above the \(W^\pm\), \(Z^0\), and \(H^0\) masses, \(\sqrt{s} \simeq 170\)--300\ GeV, are possible. We also discuss the possibility offered by an internal gas target, which can also be used as luminosity