Abstract
A measurement is reported of differential top quark pair ($\mathrm{t\bar{t}}$) production cross sections, where top quarks are produced at large transverse momenta. The data collected with the CMS detector at the LHC are from pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The measurement uses events where at least one top quark decays as t $\to$ Wb $\to$ qq'b and is reconstructed as a large-radius jet with transverse momentum in excess of 400 GeV. The second top quark is required to decay either in a similar way, or leptonically, as inferred from a reconstructed electron or muon, a bottom quark jet, and a missing transverse momentum due to the undetected neutrino. The cross section is extracted as a function of kinematic variables of individual top quarks or of the $\mathrm{t\bar{t}}$ system. The results are presented at the particle level, within a region of phase space close to that of the experimental acceptance, and at the parton level, and are compared to various theoretical models. In both decay channels the observed absolute cross sections are significantly lower than the predictions from theory, while the normalized differential measurements are well described.
Highlights
The top quark completes the third generation of quarks in the standard model (SM), and a precise understanding of its properties is critical for the overall consistency of the theory
This paper reports a measurement of the differential tt production cross section in the boosted regime in the all-jet acnodllisleiopntosnaþt pjeffisffits1⁄4fi1n3alTsetaVtesre. cTohrdeerdesbuyltsthaereCbMaSseddeotenctpopr, corresponding to a total integrated luminosity of 35.9 fb−1
The measurement utilizes a larger dataset relative to previous results to explore a wider phase space of tt production and to elucidate any discrepancies with theory that were reported in previous publications
Summary
The top quark completes the third generation of quarks in the standard model (SM), and a precise understanding of its properties is critical for the overall consistency of the theory. The large tt yield expected in pp collisions at the CERN LHC enables measurements of the tt production rate as functions of kinematic variables of individual top quarks and the tt system Such measurements have been performed at the ATLAS [1,2,3,4,5,6,7,8,9] and CMS [10,11,12,13,14,15,16,17,18,19] experiments at 7, 8, and 13 TeV center-of-mass energies, assuming a resolved final state where the decay products of the tt system can be reconstructed individually. Integrated luminosity and higher center-of-mass energy compared to previous CMS results [22] This provides a sharper confrontation with theory over data in a wider region of phase space.
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