Abstract (data abstract)

Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 inverse-femtobarns, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from ttW or ttZ decays. The ttW cross section is measured to be 382 +117 -102 fb with a significance of 4.8 standard deviations from the background-only hypothesis. The ttZ cross section is measured to be 242 +65 -55 fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the ttW and ttZ cross sections.

Table 1

Data from Page 10 of arXiv preprint

10.17182/hepdata.69486.v1/t1

Expected yields after the final fit, compared to the observed data for OS t$\bar{\mathrm{t}}$Z final states. Here ``hf'' and ``lf''...
Table 2

Data from Page 10 of arXiv preprint

10.17182/hepdata.69486.v1/t2

Expected yields after the final fit, compared to the observed data for SS t$\bar{\mathrm{t}}$W final states. The multiboson process includes...
Table 3

Data from Page 11 of arXiv preprint

10.17182/hepdata.69486.v1/t3

Expected yields after the final fit, compared to the observed data for 3$\ell$ t$\bar{\mathrm{t}}$W and three and 4$\ell$ t$\bar{\mathrm{t}}$Z final...
Table 4

Data from Page 20 of arXiv preprint

10.17182/hepdata.69486.v1/t4

Expected and observed measurements of the cross section and signal strength with 68% CL ranges and significances for t$\mathrm{\bar{t}}$W, in...
Table 5

Data from Page 20 of arXiv preprint

10.17182/hepdata.69486.v1/t5

Expected and observed measurements of the cross section and signal strength with 68% CL ranges and significances for t$\mathrm{\bar{t}}$Z, in...
Table 6

Data from Page 24 of arXiv preprint

10.17182/hepdata.69486.v1/t6

Constraints from this t$\mathrm{\bar{t}}$Z and t$\mathrm{\bar{t}}$W measurement on selected dimension-six operators.

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