Measurement of the cross section for tt¯ production with additional jets and b jets in pp collisions at s = 13 TeV Academic Article uri icon

abstract

  • Abstract Measurements of the cross section for the production of top quark pairs in association with a pair of jets from bottom quarks $$ left({sigma}_{mathrm{t}overline{mathrm{t}}mathrm{b}overline{mathrm{b}}}
    ight) $$
    σ t t ¯ b b ¯
    and in association with a pair of jets from quarks of any flavor or gluons $$ left({sigma}_{mathrm{t}overline{mathrm{t}}mathrm{jj}}
    ight) $$
    σ t 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 fb1. 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 $$ {sigma}_{mathrm{t}overline{mathrm{t}}mathrm{jj}} $$ σ t t ¯ 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 $$ {sigma}_{mathrm{t}overline{mathrm{t}}mathrm{b}overline{mathrm{b}}} $$ σ t t ¯ b b ¯ are determined from the product of the $$ {sigma}_{mathrm{t}overline{mathrm{t}}mathrm{jj}} $$ σ t t ¯ 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 uncert

author list (cited authors)

  • Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Dragicevic, M., ... Trembath-reichert, S.

publication date

  • January 1, 2020 11:11 AM