Exploring the Anomalous Top-Higgs FCNC Couplings at the electron proton colliders

Abstract

We perform an updated analysis on the searches for the anomalous FCNC 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 the observability of the FCNC top-Higgs couplings through the processes ${\mathrm{e}}^{-}\mathrm{p}\to {\nu }_{\mathrm{e}}\bar{\mathrm{t}}\to {\nu }_{\mathrm{e}}\mathrm{h}\bar{\mathrm{q}}$ (signal.I) and ${\mathrm{e}}^{-}\mathrm{p}\to {\nu }_{\mathrm{e}}\mathrm{hb}$ (singal.II) at the proposed electron proton (ep) colliders, where the Higgs boson decays to a $\mathrm{b}\bar{\mathrm{b}}$ pair. We find that at the high luminosity (1 $\mathrm{a}{\mathrm{b}}^{-1}$) ep colliders where the electrons have a polarisation of $80\%$ and electron energy is typical 60 GeV, the 2$\sigma$ upper limit on $\mathrm{Br}(\mathrm{t}\to \mathrm{uh})$ are $0.15\times 10^{-2}$($2.9\times 10^{-4}$) at the 7TeV@LHeC(50TeV@FCC-eh) for signal.I and $0.15\times 10^{-2}$($2.2\times 10^{-4}$) for signal.II. We also give an estimate on how the sensitivity (take signal.I as examples) would change when we reduce the electron beam energy from 60 GeV to 50 GeV or even 40 GeV due to the cost reason. The conclusion is that the discovery potential reduce $8.7\%$($29.4\%$) if the electron beam change from 60GeV to 50(40) GeV at the 7TeV LHeC, and $16.8\%$($19.8\%$) at the 50 TeV FCC-eh.

8 figures. 4 tables. 26 pages

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Cited by in corpus (11)

• The Large Hadron-Electron Collider at the HL-LHC
• Probing top quark FCNC couplings in the triple-top signal at the high energy LHC and future circular collider
• Study of Higgs Effective Couplings at Electron-Proton Colliders
• Probing the top-Higgs boson FCNC couplings via the $h\to \gamma \gamma$ channel at the HE-LHC and FCC-hh
• Top quark anomalous FCNC production via $tqg$ couplings at FCC-hh
• Probing anomalous $tq\gamma$ and $tqg$ couplings via single top production in association with photon at FCC-hh
• Loop induced top quark FCNC through top quark and dark matter interactions
• Top FCNC interactions through dimension six four-fermion operators at the electron proton collider
• 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
• The LHeC Project: e-Ring Revisited