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Search for flavor-changing neutral current interactions of the top quark and the Higgs boson decaying to a bottom quark-antiquark pair at √S = 13 TeV

Journal Contribution - e-publication

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 sample corresponding to an integrated luminosity of 137 fb−1recorded by the CMS experiment at the LHC in proton-proton collisions at$$ \sqrt{s} $$s= 13 TeV. Events containing exactly one lepton (muon or electron) and at least three jets, among which at least two are identified as originating from the hadronization of a bottom quark, are analyzed. A set of deep neural networks is used for kinematic event reconstruction, while boosted decision trees distinguish the signal from the background events. No significant excess over the background predictions is observed, and upper limits on the signal production cross sections are extracted. These limits are interpreted in terms of top quark decay branching fractions ($$ \mathcal{B} $$B) to the Higgs boson and an up (u) or a charm quark (c). Assuming one nonvanishing extra coupling at a time, the observed (expected) upper limits at 95% confidence level are$$ \mathcal{B} $$B(t→Hu)<0.079 (0.11)% and$$ \mathcal{B} $$B(t→Hc)<0.094 (0.086)%.
Journal: Journal of high energy physics
ISSN: 1126-6708
Volume: 202
Publication year:2022
Keywords:A1 Journal article
Accessibility:Open