Measurement of the cross section for top quark pair production in association with a W or Z boson in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

A measurement is performed of the cross section of top quark pair production in association with a W or Z boson using proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb${}^{-1}$, collected by the CMS experiment in 2016. The measurement is performed in the same-sign dilepton, three- and four-lepton final states. The production cross sections are measured to be $\sigma (\mathrm{t}\overline{\mathrm{t}}\mathrm{W})=0.77_{-0.11}^{+0.12}{\text{(stat)}}_{-0.12}^{+0.13}\text{(syst)}$ pb and $\sigma (\mathrm{t}\overline{\mathrm{t}}\mathrm{Z})=0.99_{-0.08}^{+0.09}{\text{(stat)}}_{-0.10}^{+0.12}\text{(syst)}$ pb. The expected (observed) signal significance for the $\mathrm{t}\overline{\mathrm{t}}\mathrm{W}$ production in same-sign dilepton channel is found to be 4.5 (5.3) standard deviations, while for the $\mathrm{t}\overline{\mathrm{t}}\mathrm{Z}$ production in three- and four-lepton channels both the expected and the observed significances are found to be in excess of 5 standard deviations. The results are in agreement with the standard model predictions and are used to constrain the Wilson coefficients for eight dimension-six operators describing new interactions that would modify $\mathrm{t}\overline{\mathrm{t}}\mathrm{W}$ and $\mathrm{t}\overline{\mathrm{t}}\mathrm{Z}$ production.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-17-005 (CMS Public Pages)

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