Pileup Mitigation Techniques

We report on recent progress in the ATLAS experiment in developing tools to mitigate the effects of pile-up. Forward pile-up jet tagging techniques, as well as constituent-level pile-up suppression algorithms are discussed in details. The impacts of these approaches on both jet energy and angular resolution, as well as jet substructure and boosted object tagging performance are discussed. Improvements to various physics channels of interest are discussed and the potential future of such algorithms — both online and offline, and both at the current LHC and a future high-luminosity LHC and beyond — is considered in detail