Differential $t\bar{t}$ cross-sections and EFT limit extraction in boosted events at ATLAS

Top anti-top ($t\bar{t}$) pair production at the Large Hadron Collider (LHC) is often observed in the presence of additional high energy radiation. Similarly the abundant $t\bar{t}$ production at the LHC allows us to probe high transverse momentum ($p_{T}$) top quarks. This poster compares the latest measurements, using data recorded by the ATLAS detector from 2015 to 2018, with different QCD predictions showcasing how suited current theories are to estimating complex, multi-scale, and above leading order $t\bar{t}$ processes. Single and double-differential $t\bar{t}$ cross- section measurements as functions of various event kinematic properties are presented. Results are derived from proton-proton collisions, at a centre-of-mass energy of 13 TeV, using events with a high $p_{T}$ large-R jet, one muon or electron and at least two $b$-tagged jets in the final-state.