(Non)perturbative QCD and Jet Substructure

Perturbative QCD is a powerful tool for calculating the properties of jets at the LHC. However, there are many jet observables for which non-perturbative input from QCD is needed. In this talk, I present three case studies at the boundary between perturbative and non-perturbative QCD---ratio observables, track-based measurements, and hadronization effects---all of which are relevant for new physics searches at the LHC.