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A search is performed for charged-lepton flavor violating processes in topquark (t) production and decay. The data were collected by the CMS experimentfrom proton-proton collisions at a center-of-mass energy of 13 TeV andcorrespond to an integrated luminosity of 138 fb$^{-1}$. The selected eventsare required to contain one opposite-sign electron-muon pair, a third chargedlepton (electron or muon), and at least one jet of which no more than one isassociated with a bottom quark. Boosted decision trees are used to distinguishsignal from background, exploiting differences in the kinematics of the finalstates particles. The data are consistent with the standard model expectation.Upper limits at 95% confidence level are placed in the context of effectivefield theory on the Wilson coefficients, which range between 0.024-0.424TeV$^{-2}$ depending on the flavor of the associated light quark and theLorentz structure of the interaction. These limits are converted to upperlimits on branching fractions involving up (charm) quarks, t$\to$e$\mu$u(t$\to$e$\mu$c), of 0.032 (0.498)$\times$10$^{-6}$, 0.022(0.369)$\times$10$^{-6}$, and 0.012 (0.216)$\times$10$^{-6}$ for tensor-like,vector-like, and scalar-like interactions, respectively.

Search for charged-lepton flavor violation in the production and decay  of top quarks using trilepton final states in proton-proton collisions at  $\sqrt{s}$ = 13 TeV