Measurement of the $\mathrm{t\bar{t}}\mathrm{b\bar{b}}$ production cross section in the all-jet final state in pp collisions at $\sqrt{s} =$ 13 TeV

  • Freya Blekman (Creator)
  • Emil Sørensen Bols (Creator)
  • Simranjit Singh Chhibra (Creator)
  • Jorgen D'Hondt (Creator)
  • Jarne Theo De Clercq (Creator)
  • Denys Lontkovskyi (Creator)
  • Steven Lowette (Creator)
  • Ivan Marchesini (Creator)
  • Seth Moortgat (Creator)
  • Quentin Python (Creator)
  • Kirill Skovpen (Creator)
  • Stefaan Tavernier (Creator)
  • Walter Van Doninck (Creator)
  • Petra Van Mulders (Creator)
  • Douglas Burns (Creator)

Dataset

Abstract

A measurement of the production cross section of top quark pairs in association with two b jets (ttbb)
is presented using data collected in proton-proton collisions at √s = 13 TeV by the CMS detector at the
LHC corresponding to an integrated luminosity of 35.9 fb−1. The cross section is measured in the alljet decay channel of the top quark pair by selecting events containing at least eight jets, of which at
least two are identified as originating from the hadronization of b quarks. A combination of multivariate
analysis techniques is used to reduce the large background from multijet events not containing a top
quark pair, and to help discriminate between jets originating from top quark decays and other additional
jets. The cross section is determined for the total phase space to be 5.5 ± 0.3 (stat)+1.6
−1.3 (syst) pb and
also measured for two fiducial ttbb definitions. The measured cross sections are found to be larger than
theoretical predictions by a factor of 1.5–2.4, corresponding to 1–2 standard deviations.
Datum van beschikbaarheid10 aug 2021
UitgeverHEPData

Format

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