Probing Anomalous FCNC Top-Higgs Yukawa Couplings at the Large Hadron Electron Collider

Abstract

In this paper, we study the anomalous flavor changing neutral current Yukawa interactions between the top quark, the Higgs boson, and either an up or charm quark ($\mathrm{tqH},\mathrm{q}=\mathrm{u},\mathrm{c}$). We probe these couplings in ${\mathrm{e}}^{-}\mathrm{p}\to {\nu }_{\mathrm{e}}\bar{\mathrm{t}}\to {\nu }_{\mathrm{e}}\mathrm{H}\bar{\mathrm{q}}$ and the channel ${\mathrm{e}}^{-}\mathrm{p}\to {\nu }_{\mathrm{e}}\mathrm{Hb}$. Both channels are induced by charged current interactions through ${\mathrm{e}}^{-}\mathrm{p}$ collision at the Large Hadron Electron Collider(LHeC). We study the signatures with the Higgs decay modes $\mathrm{H}\to \gamma \gamma ,\mathrm{b}\bar{\mathrm{b}}$ and ${\tau }^{+}{\tau }^{-}$. Our results show that the flavor changing couplings ${\kappa }_{\mathrm{tqH}}$ can be probed down to a value of 0.0162 in ${\mathrm{e}}^{-}\mathrm{p}\to {\nu }_{\mathrm{e}}\bar{\mathrm{t}}\to {\nu }_{\mathrm{e}}\mathrm{H}\bar{\mathrm{q}}$ with $\mathrm{H}\to \mathrm{b}\bar{\mathrm{b}}$ at a 14 TeV LHeC with a 150 GeV electron beam and 200 $\mathrm{f}{\mathrm{b}}^{-1}$ luminosity. This value of the coupling corresponds to the branching ratio $\mathrm{Br}(\mathrm{t}\to \mathrm{qH})=1.34\times 0^{-4}$.

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Cited by in corpus (15)

• The Large Hadron-Electron Collider at the HL-LHC
• Single top-quark production at the Tevatron and the LHC
• Search for single production of vector-like top partners at the Large Hadron Electron Collider
• New flavor physics in di- and tri-lepton events from single-top at the LHC and beyond
• Invisible Higgs Decay at the LHeC
• Searches for top-Higgs FCNC couplings via the Whj signal with $h\to \gamma \gamma$ at the LHC
• Searches for anomalous $tqZ$ couplings from the trilepton signal of $tZ$ associated production at the 14 TeV LHC
• Multi-lepton probes of new physics and lepton-universality in top-quark interactions
• Exploring the Anomalous Top-Higgs FCNC Couplings at the electron proton colliders
• Searches for the FCNC couplings from top-Higgs associated production signal with $h\to \gamma \gamma$ at the LHC
• Top quark FCNC couplings at future circular hadron electron colliders
• Top FCNC interactions through dimension six four-fermion operators at the electron proton collider
• Loop induced top quark FCNC through top quark and dark matter interactions
• Probing anomalous top-Higgs couplings at the HL-LHC via $H\to W{W}^{\ast }$ decay channels
• Exploring Anomalous Flavor-Changing Neutral tqh Transitions at Future Muon Colliders: Insights from ${\mu }^{+}{\mu }^{-}\to t\bar{q}h$ Interactions