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The physics potential for boosted topologies in top-quark pair production isstudied at centre-of-mass energies of 1.4 TeV and 3 TeV at the proposedhigh-luminosity linear electron-positron Compact Linear Collider (CLIC). Theanalyses presented in this paper focus on "single lepton+jets" ttbar finalstates and apply jet sub-structure techniques to explore the highly collimatedjet environment above 1 TeV. The charged lepton is used to determine the chargeof both top quarks. We present results for the ttbar production cross sectionand the forward-backward asymmetry in the kinematic region where the effectivecollision energy is above 1.2 TeV (2.6 TeV) for operation at 1.4 TeV (3 TeV),taking into account the CLIC luminosity spectrum and initial-state radiation.The results are based on detailed Monte Carlo simulation studies with a GEANT4based simulation of the CLIC_ILD detector concept and particle-flow based eventreconstruction. All data samples considered include beam-induced backgroundsand other relevant background processes. The expected precision on the ttbarproduction cross section and the forward-backward asymmetry are 1.1% (2.0%) and1.4% (2.3%), respectively, for operation at 1.4 TeV (3 TeV) with an integratedluminosity of 2.0 inverse attobarn (4.0 inverse attobarn) and with -80%electron polarisation. For improved Beyond Standard Model reach, operation isalso foreseen at +80% electron polarisation, with an integrated luminosity of0.5 inverse attobarn (1.0 inverse attobarn) at 1.4 TeV (3 TeV), where thecorresponding numbers are about a factor 2.5 higher.

Physics potential for boosted topologies in top-quark pair production at a multi-TeV Compact Linear Collider