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We study the search for an extra scalar $S$ boson produced in associationwith the $Z$ boson at the International Linear Collider (ILC). The study isperformed at center-of-mass energies of 250 GeV and 500 GeV based on the fullsimulation of the International Large Detector (ILD). In order to be asmodel-independent as possible, the analysis uses the recoil technique, inparticular 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 $k$ withrespect to the Standard Model Higgs-strahlung process cross section. Thesepredicted results, covering all possible searching regions of the extra scalarsat the 250 GeV ILC and the 500 GeV ILC, can be interpreted independently of thedecay modes of the $S$ boson.

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