Probing the top-Higgs boson FCNC couplings via the $h\to \gamma \gamma$ channel at the HE-LHC and FCC-hh

Abstract

We investigate the sensitivity of future searches for the top-Higgs boson Flavour Changing Neutral Current (FCNC) couplings $tqh$~($q=u,c$) at the proposed High Energy Large Hadron Collider~(HE-LHC) and Future Circular Collider in hadron-hadron mode (FCC-hh). We perform a full simulation for two processes in the $h\to \gamma \gamma$ decay channel (where $h$ is the discovered Higgs state): single top quark FCNC production in association with the Higgs boson (plus a jet) and top quark pair production with FCNC decays $t\to qh$. All the relevant backgrounds are considered in a cut based analysis to obtain the limits on the Branching Ratios (BRs) of $t\to uh$ and $t\to ch$. It is shown that, at the HE-LHC with an integrated luminosity of 15 ab${}^{-1}$ and at the FCC-hh with an integrated luminosity of 30 ab${}^{-1}$, {{the BR($t\to uh$) (BR($t\to ch$)) can be probed, respectively, to $7.0(8.5)\times 10^{-5}$ and $2.3(3.0)\times 10^{-5}$ at the 95\% Confidence Level (CL) (assuming a 10\% systematic uncertainty on the background), which is almost two orders of magnitude better than the current 13 TeV LHC experimental results.

19 pages, 5 figures, references added, typos corrected, version in Physical Review D

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Cited by in corpus (11)

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• Probing tqZ anomalous couplings in the trilepton signal at the HL-LHC, HE-LHC and FCC-hh
• Flavour-changing neutral scalar interactions of the top quark
• Scotogenic top-quark FCNC decays
• Non-diagonal contributions to $Z\gamma V^{\ast }$ vertex, polarizations and bounds on $Z\overline{t}q$ couplings
• $CP$ violation in the $HZZ$ vertex and left-right asymmetries
• Studying Same-Sign Top Pair Production in Flavor Changing Scalar Models at the HL-LHC
• Investigating Top-Higgs FCNC Couplings at the FCC-hh
• Lepton flavor violating top quark FCNC processes at the $\mu$TRISTAN
• Two Higgs doublet model fitting and $t\bar{t}b\bar{b}$ signal at the ILC
• Exploring Anomalous Flavor-Changing Neutral tqh Transitions at Future Muon Colliders: Insights from ${\mu }^{+}{\mu }^{-}\to t\bar{q}h$ Interactions