Searches for exotic decays of the Higgs boson as a window to the dark sector with the ATLAS detector"

The study of the 125 GeV Higgs boson can open a window of sensitivity to a new dark sector. Results of searches for both prompt and non-prompt decays of the Higgs boson into new dark sector particles in 13 TeV pp collisions with the ATLAS detector are presented. Searches that encompass a wide range of new particle masses, lifetimes and degrees of collimation of decay products are discussed.