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

Bruno, Giacomo;Bury, Florian Joel J;Caputo, Claudio;David, Pieter;Zobec, Joze;et.al.
(2021) Physical Review D, Particles, Fields, Gravitation and Cosmology — Vol. 103 (2021) (2021) (2021) (2021)

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Authors
  • Bruno, GiacomoUCLouvain
    Author
  • Bury, Florian Joel JUCLouvain
    Author
  • Caputo, ClaudioUCLouvain
    Author
  • David, PieterUCLouvain
    Author
  • Delaere, Christopheorcid-logoUCLouvain
    Author
  • Delcourt, MartinUCLouvain
    Author
  • Donertas, Izzeddin SuatUCLouvain
    Author
  • Giammanco, Andreaorcid-logoUCLouvain
    Author
  • Lemaitre, VincentUCLouvain
    Author
  • Prisciandaro, JessicaUCLouvain
    Author
  • Saggio, AlessiaUCLouvain
    Author
  • Taliercio, AngelaUCLouvain
    Author
  • Teklishyn, MaksymUCLouvain
    Author
  • Vischia, PietroUCLouvain
    Author
  • Wuyckens, SophieUCLouvain
    Author
  • Zobec, JozeUCLouvain
    Author
  • et. al.
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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.
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Bruno, G., Bury, F. J. J., Caputo, C., David, P., Delaere, C., Delcourt, M., Donertas, I. S., Giammanco, A., Lemaitre, V., Prisciandaro, J., Saggio, A., Taliercio, A., Teklishyn, M., Vischia, P., Wuyckens, S., Zobec, J., & et al. (2021). 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. Physical Review D, Particles, Fields, Gravitation and Cosmology, 103 (2021) (2021) (2021). https://doi.org/10.1103/PhysRevD.103.052008 (Original work published 2021)