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The dependence of the top-quark mass measurement in top-quark pair productionon the parton distribution functions (PDF) is explored through differentialmass distributions in $t\bar{t}$ and $t\bar{t}j$ production at the LHC and afuture 100 TeV proton-proton collider. The top-quark mass uncertainty isobtained from chi-squared fits to invariant mass distributions from simulationsassuming different top pole masses around the nominal value of 172.5 GeV. ThePDF uncertainties of the differential distributions are used in the chi-squareevaluation and reduced through a fit to differential distributions in$t\bar{t}$ and $t\bar{t}j$ production.

Future Top Quark Pole Mass Improvements from PDF Updates