Measurement of the associated production of a single top quark and a Z boson in pp collisions at $\sqrt{s}=$ 13 TeV

Abstract

A measurement is presented of the associated production of a single top quark and a Z boson. The study uses data from proton-proton collisions at $\sqrt{s}=$ 13 TeV recorded by the CMS experiment, corresponding to an integrated luminosity of 35.9 fb${}^{-1}$. Using final states with three leptons (electrons or muons), the tZq production cross section is measured to be $\sigma$(pp$\to$tZq$\to$Wb${\ell }^{+}{\ell }^{-}$q) = $123_{-31}^{+33}$ (stat) ${}_{-23}^{+29}$ (syst) fb, where $\ell$ stands for electrons, muons, or $\tau$ leptons, with observed and expected significances of 3.7 and 3.1 standard deviations, respectively.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-16-020 (CMS Public Pages)

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• Single-top associated production with a $Z$ or $H$ boson at the LHC: the SMEFT interpretation
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