Probing the Anomalous FCNC Interactions in Top-Higgs Final State and Charge Ratio Approach

Abstract

We study the anomalous production of a single top quark in association with a Higgs boson at the LHC originating from flavor changing neutral current (FCNC) interactions in $tqg$ and $tqH$ vertices. We derive the discovery potentials and $68\%$ C.L. upper limits considering leptonic decay of the top quark and the Higgs boson decay into a $b\bar{b}$ pair with 10 fb${}^{-1}$ integrated luminosity of data in proton-proton collisions at the center-of-mass energy of 14 TeV. We propose a charge ratio for the lepton in top quark decay in terms of lepton $p_T$ and $\eta$ as a strong tool to observe the signal. In particular, we show that the charge ratio increases significantly at large $p_T$ of the charged lepton. While the main background from $t\bar{t}$ is nearly charge symmetric and $W+jets$ background has much smaller charge ratio with respect to the signal. We show that this feature can also be used in the probe of anomalous single top production with a $Z-$boson or a photon which are under the attention of the experimental collaborations.

18 pages, 8 figures, to appear in Phys. Rev. D

References in corpus (11)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• FeynRules - Feynman rules made easy
• Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics
• Next-to-leading order QCD corrections to the top quark decay via model-independent FCNC couplings
• Search for flavor changing neutral currents via quark-gluon couplings in single top quark production using 2.3 fb^-1 of ppbar collisions
• Top Quark Physics at the LHC: A Review of the First Two Years
• R-parity violating effects in top quark FCNC productions at LHC
• Constraints on flavor-changing neutral-current $Htq$ couplings from the signal of $tH$ associated production with QCD next-to-leading order accuracy at the LHC
• Top quark physics at the LHC
• FCNC-induced heavy-quark events at the LHC from Supersymmetry

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