INSPIRE Georges Aad Brad Abbott Jalal Abdallah Ovsat Abdinov Rosemarie Aben Maris Abolins Ossama AbouZeid Halina Abramowicz Henso Abreu Ricardo Abreu 2025-11-17 CERN-LHC. Measurement of the differential cross-section for pair production of top quarks with high transverse momentum ($p_T$), with respect to the transverse momentum of the top quark, obtained using the lepton+jets channel. The hadronically decaying top quark is reconstructed as an anti-kt jet with radius parameter R=1.0 and identified with jet substructure techniques. The measurement is obtained using 20.3 fb-1 of proton--proton collisions at a center-of-mass energy of 8 TeV and is corrected at both particle-level, in a fiducial region close to the event selection, and at parton-level, for events with top quarks with $p_T$ > 300 GeV. The fiducial region is defined as (see also Table 1 of the paper): - Exactly one lepton (e or mu) - p_T(lepton) > 25 GeV and |eta(lepton)| < 2.5 - p_T(anti-kt R=0.4 jets) > 25 GeV and |eta(anti-kt R=0.4 jets)| < 2.5 - MET > 20 GeV and MET+MTW > 60 GeV (MTW is the transverse mass between the lepton and the MET) - at least one anti-kt R=0.4 jets within Delta-R < 1.5 from the lepton - at least one anti-kt R=1.0 jets with p_T > 300 GeV, mass > 100 GeV, sqrt(d_12) > 40 GeV (sqrt(d_12) is the first splitting scale) - $\Delta R$(anti-kt R=1.0 jet, anti-kt R=0.4 jet) > 1.5 and $\Delta \phi$(anti-kt R=1.0 jet, lepton) > 2.3 - At least one of the anti-kt R=0.4 jets is b-tagged among: (a) the leading jet within $\Delta R$ < 1.5 from the lepton; (b) one jet within $\Delta R$ < 1.0 from anti-kt R=1.0 jet axis. https://service.tib.eu/vdataset/inspirehep_951d0679-a0b3-4c72-9664-f4449d0f9379 en INSPIRE-HEP Measurement of the differential cross-section of highly boosted top quarks as a function of their transverse momentum in $\sqrt{s}$ = 8 TeV proton-proton collisions using the ATLAS detector dataset