ATLAS sensitivity to top squark pair production at the HL-LHC

This document summarises the expected ATLAS sensitivity to stops with 3 ab$^{-1}$ of $\sqrt{s} = 14$ TeV proton-proton collisions collected at the HL-LHC. The top squarks are pair produced and assumed to decay into a top quark and a neutralino. Prompt leptons are vetoed in the final state, which is only composed by jets and missing transverse momentum. A 5$\sigma$ discovery (95% CL exclusion) can be obtained for top squark masses up to 1.25 (1.7) TeV and small neutralino masses, assuming realistic projections of the systematic uncertainties. If the top squark mass equals the sum of the top quark and neutralino masses, then a 5$\sigma$ discovery (95% CL exclusion) can be achieved up to about 650 (850) GeV.