Measurement of the cross section for $$\mathrm{t}\overline{\mathrm{t}}$$ production with additional jets and b jets in pp collisions at $$\sqrt{s}$$ = 13 TeV
Measurements of the cross section for the production of top quark pairs in association with a pair of jets from bottom quarks \( \left({\sigma}_{\mathrm{t}\overline{\mathrm{t}}\mathrm{b}\overline{\mathrm{b}}}\right) \) and in association with a pair of jets from quarks of any flavor or gluons \( \left({\sigma}_{\mathrm{t}\overline{\mathrm{t}}\mathrm{jj}}\right) \) 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 for the dilepton and lepton+jets channels, where lepton corresponds to either an electron or a muon. The results of the measurements in the fiducial phase space for the dilepton and lepton+jets channels, respectively, are \( {\sigma}_{\mathrm{t}\overline{\mathrm{t}}\mathrm{jj}} \) = 2.36±0.02 (stat)±0.20 (syst) pb and 31.0±0.2 (stat)±2.9 (syst) pb, and for the cross section ratio 0.017 ± 0.001 (stat) ± 0.001 (syst) and 0.020 ± 0.001 (stat) ± 0.001 (syst). The values of \( {\sigma}_{\mathrm{t}\overline{\mathrm{t}}\mathrm{b}\overline{\mathrm{b}}} \) are determined from the product of the \( {\sigma}_{\mathrm{t}\overline{\mathrm{t}}\mathrm{jj}} \) and the cross section ratio, obtaining, respectively, 0.040±0.002 (stat)±0.005 (syst) pb and 0.62±0.03 (stat)±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.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359; SC0010005
- OSTI ID:
- 1644280
- Alternate ID(s):
- OSTI ID: 1721684
- Report Number(s):
- FERMILAB-PUB-20-129-CMS; arXiv:2003.06467; CMS-TOP-18-002; CERN-EP-2020-011; oai:inspirehep.net:1785614; TRN: US2202660
- Journal Information:
- Journal of High Energy Physics (Online), Vol. 2020, Issue 7; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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