Mitchell Institute for Fundamental Physics & Astronomy
College Station, Texas 77843
Particle and astro-particle physics data support the possible existence of a Dark or Hidden Sector of phenomena that has eluded our efforts to characterize them. The Higgs boson, because it couples to matter in a way like no other Standard Model particle, may provide a portal or doorway to this new physics. An overview of an ATLAS Dark Sector search that uses the four lepton final state in Higgs boson decays will be presented.