CMS-PAS-TOP-18-009

CMS-PAS-TOP-18-009
Measurement of top quark pair production in association with a Z boson in proton-proton collisions at $\sqrt{s} =$ 13 TeV
CMS Collaboration
March 2019

Abstract: A measurement of the cross section of top quark pair production in association with a Z boson using proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC is performed. The data sample corresponds to an integrated luminosity of 77.5 fb $^{-1}$ , collected by the CMS experiment during 2016 and 2017. The measurement is performed in the three- and four-lepton final states. The production cross section is measured to be $\sigma(\mathrm{t}\overline{\mathrm{t}}\mathrm{Z})=$ 1.00 $^{+0.06}_{-0.05}$ (stat) $^{+0.07}_{-0.06}$ (syst) pb. Differential cross sections are measured as a function of the transverse momentum of the Z boson and the angular distribution of the decay lepton. New stringent limits on the anomalous couplings of the top quark to the Z boson are obtained, including estimates of Wilson coefficients of standard model effective field theory.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, JHEP 03 (2020) 056. The superseded preliminary plots can be found here.

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