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

Abstract

A measurement of the production cross section of top quark pairs in association with two b jets ($\mathrm{t}\bar{\mathrm{t}}\mathrm{b}\bar{\mathrm{b}}$) is presented using data collected in proton-proton collisions at $\sqrt{s}=$ 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 all-jet 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 $\pm$ 0.3 (stat) ${}_{-1.3}^{+1.6}$ (syst) pb and also measured for two fiducial $\mathrm{t}\bar{\mathrm{t}}\mathrm{b}\bar{\mathrm{b}}$ 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.

Replaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-18-011 (CMS Public Pages)

References in corpus (21)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Herwig++ Physics and Manual
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• Particle-flow reconstruction and global event description with the CMS detector
• Pileup subtraction using jet areas
• Vector boson pair production at the LHC
• The CMS trigger system
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV
• ZZ production at hadron colliders in NNLO QCD
• $W^{+}{W}^{-}$ production at hadron colliders in NNLO QCD
• Classification without labels: Learning from mixed samples in high energy physics
• Higgs boson production in association with top quarks in the POWHEG BOX
• Colour reconnections in Herwig++
• Effects of color reconnection on $t\bar{t}$ final states at the LHC
• Limiting Top-Higgs Interaction and Higgs-Boson Width from Multi-Top Productions
• Search for standard model production of four top quarks in the lepton + jets channel in pp collisions at sqrt(s) = 8 TeV
• Measurement of the cross section ratio sigma(t t-bar b b-bar) / sigma(t t-bar jj) in pp collisions at sqrt(s) = 8 TeV

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