Abstract: A search for flavor-changing neutral currents (FCNC) in events with the top quark and the Higgs boson is presented. The Higgs boson decay to a pair of b quarks is considered. The data sample corresponds to an integrated luminosity of 35.9 fb?1 recorded by the CMS experiment at the LHC in proton-proton collisions at ?s=13 TeV. Two channels are considered: single top quark FCNC production in association with the Higgs boson (pp ? tH), and top quark pair production with FCNC decay of the top quark (t ? qH). Final states with one isolated lepton and at least three reconstructed jets, among which at least two are associated with b quarks, are studied. No significant deviation is observed from the predicted background. Observed (expected) upper limits at 95% confidence level are set on the branching fractions of top quark decays, ?(t?? uH)?< 0.47% (0.34%) and ?(t ? cH)?< 0.47% (0.44%), assuming a single nonzero FCNC coupling.

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