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A measurement is reported of differential top quark pair($\mathrm{t\bar{t}}$) production cross sections, where top quarks are producedat large transverse momenta. The data collected with the CMS detector at theLHC are from pp collisions at a center-of-mass energy of 13 TeV correspondingto an integrated luminosity of 35.9 fb$^{-1}$. The measurement uses eventswhere at least one top quark decays as t $\to$ Wb $\to$ qq'b and isreconstructed as a large-radius jet with transverse momentum in excess of 400GeV. The second top quark is required to decay either in a similar way, orleptonically, as inferred from a reconstructed electron or muon, a bottom quarkjet, and a missing transverse momentum due to the undetected neutrino. Thecross section is extracted as a function of kinematic variables of individualtop quarks or of the $\mathrm{t\bar{t}}$ system. The results are presented atthe particle level, within a region of phase space close to that of theexperimental acceptance, and at the parton level, and are compared to varioustheoretical models. In both decay channels the observed absolute cross sectionsare significantly lower than the predictions from theory, while the normalizeddifferential measurements are well described.

physical review. d/physical review. d.

Measurement of differential $\mathrm{t\bar{t}}$ production cross  sections using top quarks at large transverse momenta in pp collisions at  $\sqrt{s} =$ 13 TeV