H→invisible at the ILC with SiD talk presented at the international workshop on future linear colliders (LCWS2021), 15-18 March 2021. C21-03-15.1

The Standard Model (SM) predicts a branching ratio of the Higgs boson decaying to invisible particles of O(0.001), though current measurements have only set upper limits on this value. The small SM-allowed rate can be enhanced if the Higgs boson decays into new particles such as dark matter. Upper limits have been placed on B_H→inv. by ATLAS and CMS at O(0.1), but the hadron environment limits precision. The ILC ‘Higgs factory’ will provide unprecedented precision of this electroweak measurement. Studies of the search for H→invisible processes in simulation are presented with SiD, a detector concept designed for the ILC. Preliminary results for expected sensitivity are provided, as well as studies considering potential systematics limitations.