Search for new particles decaying into top quark-antiquark pairs in proton-proton collisions at 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 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 tt 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.