Prospects for a search for direct pair production of top squarks in scenarios with compressed mass spectra at the high luminosity LHC with the ATLAS Detector

The current searches at the LHC have yielded a limited sensitivity to top squark pair production in scenarios with compressed mass spectra, where the top squark decays via $\tilde{t}_{1} \rightarrow t \tilde{\chi}_{1}^{0}$. The reach at the high-luminosity phase of the LHC is expected to significantly extend beyond the current limits. This document presents benchmark studies targeting dileptonic final states with a parameterised simulation of the ATLAS detector, considering proton-proton collisions at a centre-of-mass energy of 14~TeV. Results are shown for an integrated luminosity of 3000 fb$^{-1}$.