Sirunyan, A. M.Işıldak, Bora2021-01-272021-01-272020-03-101029-8479http://hdl.handle.net/10679/7232https://doi.org/10.1007/JHEP03(2020)056A measurement of the inclusive 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 using final states containing three or four charged leptons (electrons or muons), and the Z boson is detected through its decay to an oppositely charged lepton pair. The production cross section is measured to be sigma (tt<mml:mo stretchy="true"><overbar></mml:mover>Z) = 0.95 +/- 0.05 (stat) +/- 0.06 (syst) pb. For the first time, differential cross sections are measured as functions of the transverse momentum of the Z boson and the angular distribution of the negatively charged lepton from the Z boson decay. The most stringent direct limits to date on the anomalous couplings of the top quark to the Z boson are presented, including constraints on the Wilson coefficients in the framework of the standard model effective field theory.enginfo:eu-repo/semantics/openAccessArticle300051995620000210.1007/JHEP03(2020)056Hadron-Hadron scattering (experiments)Top physics2-s2.0-85081715381