Jet substructure observables are powerful tools for the identification of boosted heavy particles and for probing QCD at different energy scales in proton-proton collisions at the LHC. In this work three recent ATLAS measurements sensitive to soft QCD effects and performed with the use of jet substructures are described. Their are kt splitting scales, soft-drop jet masses and pull-jet angles. Some discrepancies between data and predictions are observed in the non-perturbative regime.
Search for long-lived, heavy particles in final states with a muon and multitrack displaced vertex in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
