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Scientific article
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English

Inclusive and differential cross-sections for dilepton $ t\overline{t} $ production measured in $ \sqrt{s} $ = 13 TeV pp collisions with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, 141
Publication date2023
First online date2023-07-17
Abstract

Differential and double-differential distributions of kinematic variables of leptons from decays of top-quark pairs ($ t\overline{t} $) are measured using the full LHC Run 2 data sample collected with the ATLAS detector. The data were collected at a pp collision energy of $ \sqrt{s} $ = 13 TeV and correspond to an integrated luminosity of 140 fb$^{−1}$. The measurements use events containing an oppositely charged eμ pair and b-tagged jets. The results are compared with predictions from several Monte Carlo generators. While no prediction is found to be consistent with all distributions, a better agreement with measurements of the lepton p$_{T}$ distributions is obtained by reweighting the $ t\overline{t} $ sample so as to reproduce the top-quark p$_{T}$ distribution from an NNLO calculation. The inclusive top-quark pair production cross-section is measured as well, both in a fiducial region and in the full phase-space. The total inclusive cross-section is found to be$ {\sigma}_{t\overline{t}}=829\pm 1\ \left(\textrm{stat}\right)\pm 13\ \left(\textrm{syst}\right)\pm 8\ \left(\textrm{lumi}\right)\pm 2\ \left(\textrm{beam}\right)\ \textrm{pb}, $where the uncertainties are due to statistics, systematic effects, the integrated luminosity and the beam energy. This is in excellent agreement with the theoretical expectation.

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Keywords
  • Hadron-Hadron Scattering
  • Top Physics
  • P p: colliding beams
  • Top: pair production
  • P p: scattering
  • Beam: energy
  • Top: decay
  • Lepton: transverse momentum
  • Transverse momentum: momentum spectrum
  • ATLAS
  • Statistics
  • Numerical calculations: Monte Carlo
  • Phase space
  • CERN LHC Coll
  • Final state: ((n)jet dilepton)
  • Electron
  • Muon
  • Jet: bottom
  • Bottom: particle identification
  • Kinematics
  • Channel cross section: measured
  • Differential cross section: measured
  • Transverse momentum dependence
  • Rapidity dependence
  • Mass dependence
  • Angular dependence
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Inclusive and differential cross-sections for dilepton $ t\overline{t} $ production measured in $ \sqrt{s} $ = 13 TeV pp collisions with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, p. 141. doi: 10.1007/jhep07(2023)141
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Article (Published version)
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ISSN of the journal1029-8479
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