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Measurements are made of differential cross-sections of highly boostedpair-produced top quarks as a function of top-quark and $t\bar{t}$ systemkinematic observables using proton--proton collisions at a center-of-massenergy of $\sqrt{s} = 13$ TeV. The data set corresponds to an integratedluminosity of $36.1$ fb$^{-1}$, recorded in 2015 and 2016 with the ATLASdetector at the CERN Large Hadron Collider. Events with two large-radius jetsin the final state, one with transverse momentum $p_{\rm T} > 500$ GeV and asecond with $p_{\rm T}>350$ GeV, are used for the measurement. The top-quarkcandidates are separated from the multijet background using jet substructureinformation and association with a $b$-tagged jet. The measured spectra arecorrected for detector effects to a particle-level fiducial phase space and aparton-level limited phase space, and are compared to several Monte Carlosimulations by means of calculated $\chi^2$ values. The cross-section for$t\bar{t}$ production in the fiducial phase-space region is $292 \pm 7 \\rm{(stat)} \pm 76 \rm{(syst)}$ fb, to be compared to the theoreticalprediction of $384 \pm 36$ fb.

physical review. d/physical review. d.

Measurements of $t\bar{t}$ differential cross-sections of highly boosted  top quarks decaying to all-hadronic final states in $pp$ collisions at  $\sqrt{s}=13\,$ TeV using the ATLAS detector