Measurement of the cross section for $\text{t}\bar{\text{t}}$ production with additional jets and b jets in pp collisions at $\sqrt{s} =$ 13 TeV
Journal
JHEP 07 (2020) 125
Journal Volume
2020
Journal Issue
7
Date Issued
2020-03-14
Author(s)
Abstract
Measurements of the cross section for the production of top quark pairs in
association with a pair of jets from bottom quarks
($\sigma_\mathrm{t\bar{t}b\bar{b}}$) and in association with a pair of jets
from quarks of any flavor or gluons ($\sigma_\mathrm{t\bar{t}jj}$) and their
ratio are presented. The data were collected in proton-proton collisions at a
center-of-mass energy of 13 TeV by the CMS experiment at the LHC in 2016 and
correspond to an integrated luminosity of 35.9 fb$^{-1}$. The measurements are
performed in a fiducial phase space and extrapolated to the full phase space,
separately in the dilepton and lepton+jets channels, where lepton corresponds
to either an electron or a muon. The results for the dilepton and lepton+jets
channels, respectively, are $\sigma_\mathrm{t\bar{t}jj}$ = 2.36 $\pm$ 0.02
(stat) $\pm$ 0.20 (syst) pb and 31.0 $\pm$ 0.2 (stat) $\pm$ 2.9 (syst) pb, and
for the cross section ratio 0.017 $\pm$ 0.001 (stat) $\pm$ 0.001 (syst) and
0.020 $\pm$ 0.001 (stat) $\pm$ 0.001 (syst). The values of
$\sigma_\mathrm{t\bar{t}b\bar{b}}$ are determined from the product of the
$\sigma_\mathrm{t\bar{t}jj}$ and the cross section ratio, obtaining,
respectively, 0.040 $\pm$ 0.002 (stat) $\pm$ 0.005 (syst) pb and 0.62 $\pm$
0.03 (stat) $\pm$ 0.07 (syst) pb. These measurements are the most precise to
date and are consistent, within the uncertainties, with the standard model
expectations obtained using a matrix element calculation at next-to-leading
order in quantum chromodynamics matched to a parton shower.
Subjects
High Energy Physics - Experiment; High Energy Physics - Experiment
Description
Replaced with the published version. Added the journal reference and
the DOI. All the figures and tables can be found at
http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-18-002
(CMS Public Pages)
the DOI. All the figures and tables can be found at
http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-18-002
(CMS Public Pages)
Type
journal article