Tumasyan, A.Adam, W.Andrejkovic, J. W.Bergauer, T.Chatterjee, S.Dragicevic, M.Del Valle, A. Escalante2025-03-232025-03-2320220031-90071079-7114https://doi.org/10.1103/PhysRevLett.129.032001https://hdl.handle.net/11486/5482Proton-proton interactions resulting in final states with two photons are studied in a search for the signature of flavor-changing neutral current interactions of top quarks (t) and Higgs bosons (H). The analysis is based on data collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb(-1.) No significant excess above the background prediction is observed. Upper limits on the branching fractions (B) of the top quark decaying to a Higgs boson and an up (u) or charm (c) quark are derived through a binned fit to the diphoton invariant mass spectrum. The observed (expected) 95% confidence level upper limits are found to be 0.019% (0.031%) for B(t -> Hu) and 0.073% (0.051%) for B(t -> Hc). These are the strictest upper limits yet determined.eninfo:eu-repo/semantics/openAccessTree-LevelDecaysStandardPairArticle129310.1103/PhysRevLett.129.032001359053652-s2.0-85135214262Q1WOS:000834348200003Q1