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| CMS-PAS-TOP-18-002 | ||
| Measurement of the cross section for $\mathrm{t}\bar{\mathrm{t}}$ production with additional jets and b jets in proton-proton collisions at $\sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| August 2019 | ||
| Abstract: The cross sections of top quark pair production in association with a pair of jets from bottom quarks ($\sigma_{\mathrm{t}\bar{\mathrm{t}}\mathrm{b}\bar{\mathrm{b}}}$) and in association with a pair of jets from quarks with any flavor or gluons ($\sigma_{\mathrm{t}\bar{\mathrm{t}}\mathrm{jj}}$) and their ratio are measured in proton-proton collisions at a center-of-mass energy of 13 TeV with data collected in 2016 by the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The measurements are performed in the visible phase space in the dilepton and lepton+jets channels separately, by fitting the distribution of the b tagging discriminant variable of the two jets that do not belong to the $\mathrm{t}\bar{\mathrm{t}}$ decay. The $\mathrm{t}\bar{\mathrm{t}}\mathrm{jj}$ cross sections in the visible phase space in the dilepton and the lepton+jets channel are measured to be 2.36 $\pm$ 0.02 (stat) $\pm$ 0.20 (syst) pb and 31.0 $\pm$ 0.2 (stat) $\pm$ 2.9 (syst) pb, respectively. The measured cross section ratio in the visible phase space is 0.017 $\pm$ 0.001 (stat) $\pm$ 0.001(syst) for the dilepton channel, and 0.020 $\pm$ 0.001 (stat) $\pm$ 0.001 (syst) for the lepton+jets channel. The results extrapolated to the full phase space are compared with the standard model expectations obtained at next-to-leading order. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 07 (2020) 125. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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