Testing the Higgs Mechanism in the Lepton Sector with multi-TeV e+e- Collisions

TL;DR

This study demonstrates that multi-TeV e+e- collisions can precisely measure the muon Yukawa coupling, confirming the Higgs mechanism in the lepton sector with high accuracy using detailed detector simulations.

Contribution

It provides a detailed simulation-based analysis of muon Yukawa coupling measurement at 3 TeV, showcasing the potential of future colliders to test the Higgs mechanism in leptons.

Findings

Muon Yukawa coupling can be measured with 4-8% accuracy.

Measurement is robust against two-photon background.

Results apply to Higgs masses between 120 and 150 GeV.

Abstract

Multi-TeV e+e- collisions provide with a large enough sample of Higgs bosons to enable measurements of its suppressed decays. Results of a detailed study of the determination of the muon Yukawa coupling at 3 TeV, based on full detector simulation and event reconstruction, are presented. The muon Yukawa coupling can be determined with a relative accuracy of 0.04 to 0.08 for Higgs bosons masses from 120 GeV to 150 GeV, with an integrated luminosity of 5 inverse-ab. The result is not affected by overlapping two-photon background.