Yetkin, Elif Aslı2022-12-272022-12-272022-08-241079-71140031-9007https://hdl.handle.net/11411/4944https://doi.org/10.1103/PhysRevLett.129.032001Abstract: Proton-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-LEVELDECAYSSTANDARDPAIRArticle10.1103/PhysRevLett.129.03200135905365N/AWOS:000834348200003