Expected ATLAS Measurement Capabilities of Observables Sensitive to Nuclear Parton Distributions

The study of proton-nucleus collisions at the LHC provides an opportunity to study QCD in regimes of high parton density and high center of mass energy but with the expectations that final state effects associated with a quark-gluon plasma will be small if present at all. Therefore, proton-nucleus collisions serve a twofold purpose within the heavy-ion program at the LHC: to understand the nature of initial state nuclear effects at the partonic scale, and as a control system for nucleus-nucleus collisions. This note discusses projections for representative ATLAS measurements exploring nuclear modifications to parton distributions in LHC Runs 3 and 4.