Measuring the Higgs Self-Coupling Constant at a Multi-TeV Muon Collider

Abstract

A lepton collider in the multi-TeV range has the potential to measure the trilinear Higgs self-coupling constant $λ_{hhh}$ via the W-fusion mode $\ell^+\ell^- \rightarrow ν_\ell \barν_\ell h h$. In this paper we do a generator-level study to explore how center-of-mass energy spread, cone size, tracking resolution, and collision energy range affect how precisely a muon collider can measure $λ_{hhh}$ in comparison to an $e^+e^-$ collider. The smaller spread in center-of-mass energy and higher energy range of a muon collider improve cross section while the larger cone required to reduce beam-induced background hinders detection of double-Higgs events. Our results motivate a more detailed study of a multi-TeV muon collider and innovative detector and analysis technologies required for background rejection and precision measurement.

This paper has been withdrawn due to not being submitted with permission of all authors