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A search for flavor-changing neutral current interactions of the top quark(t) and the Higgs boson (H) is presented. The search is based on a data samplecorresponding to an integrated luminosity of 137 fb$^{-1}$ recorded by the CMSexperiment at the LHC in proton-proton collisions at $\sqrt{s}$ = 13 TeV.Events containing exactly one lepton (muon or electron) and at least threejets, among which at least two are identified as originating from thehadronization of a bottom quark, are analyzed. A set of deep neural networks isused for kinematic event reconstruction, while boosted decision treesdistinguish the signal from the background events. No significant excess overthe background predictions is observed, and upper limits on the signalproduction cross sections are extracted. These limits are interpreted in termsof top quark decay branching fractions ($\mathcal{B}$) to the Higgs boson andan up (u) or a charm quark (c). Assuming one nonvanishing extra coupling at atime, the observed (expected) upper limits at 95% confidence level are$\mathcal{B}$(t $\to$ Hu) $\lt$ 0.079 (0.11)% and $\mathcal{B}$(t $\to$ Hc)$\lt$ 0.094 (0.086)%.

the journal of high energy physics/the journal of high energy physics

Search for flavor-changing neutral current interactions of the top quark  and the Higgs boson decaying to a bottom quark-antiquark pair at $\sqrt{s}$ =  13 TeV