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A measurement of the cross section for the production of top quark–antiquark pairs ( ) in association with a vector boson V (W or Z) in proton-proton collisions at is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and ) channels: a same-sign dilepton analysis targeting events, and trilepton and four-lepton analyses designed for events. In the same-sign dilepton channel, the cross section is measured as , corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the cross section, , is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.
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