Searches for unusual signatures from dark sectors with the ATLAS Experiment

Abstract

Various theories beyond the Standard Model predict unusual signatures, including new, long-lived particles decaying at a significant distance from the collision point. These unique signatures are difficult to reconstruct and face unusual and challenging backgrounds. This contribution will focus on recent results from searches for unusual signatures motivated by dark sector models, utilising pp collision data collected by the ATLAS experiment at the Large Hadron Collider.

Proceedings from 32nd International Symposium on Lepton Photon Interactions at High Energies, Madison, Wisconsin, USA, August 25 -29, 2025