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

Bondu, Olivier;Bruno, Giacomo;Caputo, Claudio;David, Pieter;CMS Collaboration;et.al.
(2020) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. B803, p. 135285 (2020)

Files

190905306.pdf
  • Open Access
  • Adobe PDF
  • 640.52 KB
Download

Details

Authors
  • Bondu, OlivierUCLouvain
    Author
  • Bruno, GiacomoUCLouvain
    Author
  • Caputo, ClaudioUCLouvain
    Author
  • David, PieterUCLouvain
    Author
  • Delaere, Christopheorcid-logoUCLouvain
    Author
  • Delcourt, MartinUCLouvain
    Author
  • Giammanco, Andreaorcid-logoUCLouvain
    Author
  • Lemaitre, VincentUCLouvain
    Author
  • Magitteri, AlessioUCLouvain
    Author
  • Prisciandaro, JessicaUCLouvain
    Author
  • Saggio, AlessiaUCLouvain
    Author
  • Vidal Marono, MiguelUCLouvain
    Author
  • Vischia, PietroUCLouvain
    Author
  • Zobec, JozeUCLouvain
    Author
  • CMS Collaboration
    Author
  • et. al.
Show more
Abstract
A measurement of the production cross section of top quark pairs in association with two b jets ($\mathrm{t\bar{t}}\mathrm{b\bar{b}}$) 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)${}^{+1.6}_{-1.3}$ (syst) pb and also measured for two fiducial $\mathrm{t\bar{t}}\mathrm{b\bar{b}}$ 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.
Affiliations

Citations

  • APA
  • Chicago
  • FWB

Bondu, O., Bruno, G., Caputo, C., David, P., Delaere, C., Delcourt, M., Giammanco, A., Lemaitre, V., Magitteri, A., Prisciandaro, J., Saggio, A., Vidal Marono, M., Vischia, P., Zobec, J., CMS Collaboration, & et al. (2020). 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. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, B803, 135285. https://doi.org/10.1016/j.physletb.2020.135285 (Original work published 2020)