Hayrapetyan, A.Tumasyan, A.Adam, W.Andrejkovic, J.W.Bergauer, T.Chatterjee, S.Martins, J.2026-01-102026-01-1020252470-00102470-0029https://doi.org/10.1103/95q6-vvlpA search for flavor-changing neutral current interactions of the top quark (t) and the Higgs boson (H)is presented. The search is based on proton-proton collision data collected in 2016–2018 at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, and corresponding to an integrated luminosity of 138 fb−1. Events containing a pair of leptons with the same-sign electric charge and at least one jet are considered. The results are used to constrain the branching fraction (B) of the top quark decaying to a Higgs boson and an up (u) or charm (c) quark. No significant excess above the estimated background was found. The observed (expected) upper limits at a 95% confidence level are found to be 0.072% (0.059%) for B(t → Hu) and 0.043% (0.062%) for B(t → Hc). These results are combined with two other searches performed by the CMS Collaboration for flavor-changing neutral current interactions of top quarks and Higgs bosons in final states where the Higgs boson decays to either a pair of photons or a pair of bottom quarks. The resulting observed (expected) upper limits at the 95% confidence level are 0.019% (0.027%) for B(t → Hu) and 0.037% (0.035%) for B(t → Hc). © 2025 CERN, for the CMS Collaborationeninfo:eu-repo/semantics/openAccessArticle10.1103/95q6-vvlp2-s2.0-105026353585