Measurement of the cross section for tt¯$$ \mathrm{t}\overline{\mathrm{t}} $$ production with additional jets and b jets in pp collisions at s$$ \sqrt{s} $$ = 13 TeV
Name
13130_2020_Article_13409.pdf
Size
647.73 KB
Format
Adobe PDF
Checksum (MD5)
c08591295e84df16c98983b6784b2266
Author(s)
Sirunyan, A. M
Tumasyan, A.
Adam, W.
Ambrogi, F.
Bergauer, T.
Dragicevic, M.
Erö, J.
Escalante Del Valle, A.
Flechl, M.
Frühwirth, R.
Date Issued
July 20, 2020
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2020 Jul 20;2020(7):125
Version
Final published version
Abstract
Abstract
Measurements of the cross section for the production of top quark pairs in association with a pair of jets from bottom quarks
σ
t
t
¯
b
b
¯
$$ \left({\sigma}_{\mathrm{t}\overline{\mathrm{t}}\mathrm{b}\overline{\mathrm{b}}}\right) $$
and in association with a pair of jets from quarks of any flavor or gluons
σ
t
t
¯
jj
$$ \left({\sigma}_{\mathrm{t}\overline{\mathrm{t}}\mathrm{jj}}\right) $$
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
σ
t
t
¯
jj
$$ {\sigma}_{\mathrm{t}\overline{\mathrm{t}}\mathrm{jj}} $$
= 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
σ
t
t
¯
b
b
¯
$$ {\sigma}_{\mathrm{t}\overline{\mathrm{t}}\mathrm{b}\overline{\mathrm{b}}} $$
are determined from the product of the
σ
t
t
¯
jj
$$ {\sigma}_{\mathrm{t}\overline{\mathrm{t}}\mathrm{jj}} $$
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP07(2020)125
