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An interesting model of dark matter involves a hidden sector decoupled fromStandard Model (SM) fields except for some portal interaction. A concreterealization of this is the Hidden Abelian Higgs Model, which gives rise todecays of the SM Higgs boson into a pair of new bosons, called $Z_{\mathrm{d}}$or dark photons. This note explores prospects for the search for such darkphotons at the ILC with $\sqrt{s}=250$ GeV, where the dark photons decaypromptly. For the $H\rightarrow Z_{\mathrm{d}}Z_{\mathrm{d}}\rightarrow 4\ell$($\ell = e,\mu$) final state, it follows closely recent similar searches at theLHC, while for the $2\ell2j$ and $4j$ final states a multivariate analysisapproach is used. This study has not been approved by the SiD consortium.

Prospects for searches for Higgs boson decays to dark photons at the ILC