# Prospects of measuring Higgs boson decays into muon pairs at the ILC

## TL;DR

This paper evaluates the potential of the ILC to measure Higgs decays into muon pairs, demonstrating expected precisions at different energies and emphasizing the importance of detector resolution for accurate measurements.

## Contribution

It provides a detailed simulation-based analysis of Higgs to muon pair decay measurement prospects at the ILC, including the impact of detector resolution improvements.

## Key findings

- Expected measurement precision of 24.9% at 250 GeV with 2 ab$^{-1}$
- Improved precision to 17.5% when combining 250 GeV and 500 GeV data
- Transverse momentum resolution critically affects measurement accuracy

## Abstract

We study the prospects of measuring the decay of the Higgs boson into a pair of muons at the International Linear Collider (ILC). The study is performed at center-of-mass energies of 250\,GeV and 500\,GeV, with fully-simulated Monte-Carlo samples based on the International Large Detector (ILD). The expected precision on cross section times branching ratio $\sigma \times \mathrm{BR}(h \to \mu ^+ \mu ^-)$ has been evaluated to be 24.9{\%} for an integrated luminosity of 2\,ab$^{-1}$ at 250\,GeV. This result improves to 17.5{\%} in combination with 4\,ab$^{-1}$ of 500\,GeV data. We also quantify the impact of the transverse momentum resolution on this analysis, and found that it is very important reach the design goal of an asymptotic resolution of $\sigma_{1/P_t} = 2 \times 10^{-5}$\,GeV$^{-1}$.