Probing effective field theory operators in the associated production of top quarks with a Z boson in multilepton final states at $\sqrt{s} =$ 13 TeV

The collaboration
CMS-TOP-21-001, 2021.

Abstract (data abstract)
CERN-LHC. Search for new top quark interactions within the framework of an effective field theory using the associated production of either one or two top quarks with a Z boson in multilepton final states. The data sample corresponds to an integrated luminosity of 138 fb$^{-1}$ of proton-proton collisions at $\sqrt{s} = 13$ TeV, collected by the CMS experiment at the CERN LHC. Five dimension-six operators modifying the electroweak interactions of the top quark are considered. Distributions used for the signal extraction are parameterized in terms of Wilson coefficients (WCs) describing the interaction strengths of the operators. All five WCs are fit to the data and confidence intervals at 95% confidence level are computed.