Yetkin, Elif Aslı2020-05-222020-05-222020-03-101029-8479https://hdl.handle.net/11411/2070https://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.eninfo:eu-repo/semantics/openAccessHadron-Hadron scattering (experiments)Top physicsArticle2-s2.0-8508171538110.1007/JHEP03(2020)056Q1WOS:000519956200002