High Precision Higgs from High Energy Muon Colliders

Abstract

Muon colliders are an exciting possibility for reaching the highest energies possible on the shortest timescale. They potentially combine the greatest strengths of e + e − and pp colliders by bridging the energy versus precision dichotomy. In this paper we study the sensitivity of Higgs properties that can be achieved with a future 3 or 10 TeV muon collider from single Higgs production. The results presented here represent the first comprehensive picture for the precision achievable including backgrounds and using fast detector simulation with Delphes. Additionally, we compare the results of fast detector simulation with available full simulation studies that include the muon collider specific Beam Induced Background, and show the results are largely unchanged. We comment on some of the strengths and weaknesses of a high energy muon collider for Higgs physics alone, and demonstrate the complementarity of such a collider with the LHC and e + e − Higgs factories. Furthermore, we discuss some of the exciting avenues for improving future results from both theoretical and detector R&D that could be undertaken.

The Future of US Particle Physics: The Energy Frontier Report – 2021 US Community Study on the Future of Particle Physics

“…The cleaner e + e − environment aided by beam polarization could become a sensitive probe to reveal more subtle phenomena [31]. For highenergy Muon Colliders, the primary driver is the cleaner environment plus increased statistics [32]. The measurement of the Higgs self-coupling demands access to high-energy center-of-mass collisions to benefit from the larger dataset of hh pairs and is a major goal of all future colliders.…”

Snowmass 2021 White Paper: Higgs Coupling Sensitivities and Model-Independent Bounds on the Scale of New Physics

“…Comparisons of the sensitivity of future colliders for these measurements is an important input in comparing different proposals for future colliders. For example, Table 1 contains such a comparison, using numbers from the Higgs@FutureColliders study for the European Strategy Report [1], as well as muon collider sensitivities from [2][3][4][5].…”

“…Approximate 2σ sensitivities for Higgs couplings obtained by doubling the 1σ sensitivities reported in the Higgs@FutureColliders study [1]. The muon collider numbers use numbers from [2][3][4][5]. The sensitivities are obtained under the assumption that there are no additional light states that the Higgs decays into ('kappa-0 scenario').…”