Search for new particles decaying into top quark-antiquark pairs in proton-proton collisions at $ \sqrt{s} = $ 13 TeV

A search for new particles decaying to top quark-antiquark pairs is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV. The data set recorded with the CMS detector between 2016 and 2018 is used, corresponding to an integrated luminosity of 138 fb$ ^{-1}$. Final states with 0, 1, and 2 leptons are analyzed, covering all decay modes of the top quark-antiquark pairs. Heavy $ \mathrm{Z}^{'} $ bosons with relative widths of 1, 10, and 30\% are excluded for masses in the ranges 0.4-4.8, 0.4-6.2, and 0.4-7.4 TeV, respectively. A Kaluza-Klein gluon in the Randall-Sundrum model and a dark-matter mediator are excluded for masses between 0.5-5.5 and 1.0-4.2 TeV, respectively. These results set the most stringent limits to date for the considered models in the $ \mathrm{t} \overline{\mathrm{t}} $ final state. In addition, in the two-Higgs-doublet models, upper limits are set on the coupling strength modifier for scalar and pseudoscalar Higgs bosons with relative widths of 2.5, 10, and 25\% in the mass range of 0.5-1.0 TeV.