Speaker
Description
Flavor-changing neutral currents (FCNCs) involving the top quark are highly suppressed in the Standard Model, making them powerful probes for new physics. This talk presents results from CMS searches for FCNC interactions between the top quark and the Higgs boson, photon, and Z boson, based on proton-proton collision data at \sqrt{s} = 13\;\mathrm{TeV}. The analyses target final states with leptons, photons, jets, and missing transverse energy, and employ advanced machine learning techniques for event reconstruction and signal discrimination. No significant deviations from Standard Model predictions are observed, and stringent upper limits are set on the branching fractions of rare top quark decays, with several results improving upon previous best limits.
