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In the Standard Model (SM) of particle physics, the branching ratio for Higgsboson decays to a final state which is invisible to collider detectors, $H\rightarrow ZZ^{\star} \rightarrow \nu \bar{\nu} \nu \bar{\nu}$, is order0.10%. In theories beyond the SM (BSM), this branching ratio can be enhanced bydecays to undiscovered particles like dark matter (DM). At the Large HadronCollider (LHC), the current best upper limit on the branching ratio ofinvisible Higgs boson decays is 11% at 95% confidence level. We investigate theexpected sensitivity to invisible Higgs decays with the Silicon Detector (SiD)at the International Linear Collider (ILC). We conclude that at $\sqrt{s}=250$GeV with 900 fb$^{-1}$ integrated luminosity each for $e_{L}^-e_{R}^+$ and$e_{R}^-e_{L}^+$ at nominal beam polarization fractions, the expected upperlimit is 0.16% at 95% confidence level.

Expected Sensitivity to Invisible Higgs Boson Decays at the ILC with the SiD Detector (A Snowmass White Paper)