Search for the flavor-changing neutral current interactions of the top quark and the higgs boson which decays into a pair of b quarks at ?s = 13 TeV

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2018

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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, B(t ? uH) < 0.47% (0.34%) and B(t ? cH) < 0.47% (0.44%), assuming a single nonzero FCNC coupling. � 2018, Springer Verlag. All rights reserved.

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FCNC Interaction, Hadron-Hadron scattering (experiments), Higgs physics, Top physics

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