The existence of dark matter has been established in astrophysics. However, there are no dark
matter candidates in the Standard Model (SM). If the dark matter particles or their mediator can
not interact with SM fermions or gauge bosons, the Higgs boson is the only portal to the dark
matter. We present a simulation study to search for invisible decays of the Higgs boson at the ILC
with the ILD detector.
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