Abstract
We investigate the prospects for discovering the Flavour Changing Neutral Current (FCNC) tqh couplings via the process pprightarrow th at the proposed High Energy Large Hadron Collider (HE-LHC) and Future Circular Collider in hadron-hadron mode (FCC-hh) including the realistic detector effects. The relevant SM backgrounds are considered in the cut based analysis to obtain the limits on the the branching ratios of trightarrow qh~(q=u,c), followed by the leptonic decay channel of the top quark and diphoton decay channel of the Higgs boson. The upper limits on the FCNC branching ratios at 95% confidence level (CL) and the 5sigma discovery reach for the different integrated luminosities are obtained. It is shown that at the 27 TeV HE-LHC with an integrated luminosity of 15 ab^{-1} and at the 100 TeV FCC-hh with an integrated luminosity of 30 ab^{-1}, the BR(trightarrow uh) (BR(trightarrow ch)) can be probed, respectively, to 4.4~(6.4)times 10^{-5} and 1.3~(1.6) times 10^{-5} at the 95% CL.
Highlights
Are out of range for current Large Hadron Collider (LHC) experimental sensitivities
The aim of this work is to investigate the limits on the anomalous tqh couplings by considering the process pp → th at the High Energy Large Hadron Collider (HE-LHC) and Future Circular Collider in hadron-hadron mode (FCC-hh) projects with the decay chains: t → W +b → +νb and h → γ γ
This section includes the estimations for the signal and background, the simulations and the detector effects for HE-LHC and FCC-hh
Summary
Investigated the th j final signal by considering thq FCNC couplings from three different subprocesses at the HE-LHC and FCC-hh. Their results show that the top pair production process with one of top FCNC decay could give dominant contributions. The aim of this work is to investigate the limits on the anomalous tqh couplings by considering the process pp → th at the HE-LHC and FCC-hh projects with the decay chains: t → W +b → +νb and h → γ γ. This section includes the estimations for the signal and background, the simulations and the detector effects for HE-LHC and FCC-hh.
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