Near-Threshold Production ofW±,Z0, andH0at a Fixed-Target Experiment at the Future Ultrahigh-Energy Proton Colliders

J P Lansberg,U I Uggerhøj,R Mikkelsen

doi:10.1155/2015/249167

Abstract

We outline the opportunities to study the production of the Standard Model bosons,W±,Z0, andH0, 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 tos=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 theW±,Z0, andH0masses,s≃170–300 GeV, are possible. We also discuss the possibility offered by an internal gas target, which can also be used as luminosity monitor by studying the beam transverse shape.

Highlights

We consider the possibility of performing fixedtarget experiments with the beams of the proposed highenergy LHC (HE-LHC), the Future Circular Collider hadron-hadron (FCC-hh), and the Super proton-proton Collider (SppC), which, as their names indicate, are primarily intended for collider physics
Studies performed at SLAC have shown that the beam bending by means of bent crystals is possible for high-energy positrons and electrons [9]
There is a long list of physics arguments that supports this case at the LHC

Summary

Introduction

We consider the possibility of performing fixedtarget experiments with the beams of the proposed highenergy LHC (HE-LHC) (see, e.g., [1]), the Future Circular Collider hadron-hadron (FCC-hh) (see, e.g., [2]), and the Super proton-proton Collider (SppC) (see, e.g., [3]), which, as their names indicate, are primarily intended for collider physics. Exactly as for AFTER@LHC, the potential for physics studies go well beyond that of Drell-Yan-like studies in the mass region of W and Z bosons, we wish to focus on it here as an illustrative example of the gain offered by even higher energy beams—in what we believe to be the very first paper on the use of ultrahigh-energy beam in the fixedtarget mode. The case for such W and Z studies is clear.

Beam Extraction by Means of a Bent Crystal with Ultrahigh-Energy Protons

Fixed-Target Mode and Boson Production

Findings

Conclusions