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 $\sqrts=$ 13 TeV. Two channels are considered: single top quark FCNC production in association with the Higgs boson (pp $\to$ tH), and top quark pair production with FCNC decay of the top quark (t $\to$ 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, $\mathcalB$(t $\to$ uH) $<$ 0.47% (0.34%) and $\mathcalB$(t $\to$ cH) $<$ 0.47% (0.44%), assuming a single nonzero FCNC coupling.

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 sqrt(s)=13 TeV

Cavallo, N.;Fabozzi, F.;
2018-01-01

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 $\sqrts=$ 13 TeV. Two channels are considered: single top quark FCNC production in association with the Higgs boson (pp $\to$ tH), and top quark pair production with FCNC decay of the top quark (t $\to$ 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, $\mathcalB$(t $\to$ uH) $<$ 0.47% (0.34%) and $\mathcalB$(t $\to$ cH) $<$ 0.47% (0.44%), assuming a single nonzero FCNC coupling.
2018
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/133507
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