# Search for Extra Scalars Produced in Association with Muon Pairs at the ILC

## TL;DR

This paper investigates the potential to discover an additional scalar boson produced alongside muon pairs at the ILC using a model-independent recoil technique, providing exclusion limits at 250 and 500 GeV energies.

## Contribution

It introduces a recoil-based, model-independent search method for extra scalars at the ILC, with detailed simulation results at 250 and 500 GeV.

## Key findings

- Exclusion cross-section limits are established for the extra scalar.
- The analysis covers all possible scalar search regions at the ILC.
- Results are independent of the scalar's decay modes.

## Abstract

We study the search for an extra scalar $S$ boson produced in association with the $Z$ boson at the International Linear Collider (ILC). The study is performed at center-of-mass energies of 250 GeV and 500 GeV based on the full simulation of the International Large Detector (ILD). In order to be as model-independent as possible, the analysis uses the recoil technique, in particular with the $Z$ boson decaying into a pair of muons. As a result, exclusion cross-section limits are given in terms of a scale factor $k$ with respect to the Standard Model Higgs-strahlung process cross section. These predicted results, covering all possible searching regions of the extra scalars at the 250 GeV ILC and the 500 GeV ILC, can be interpreted independently of the decay modes of the $S$ boson.