Enhancing $thj$ Production from Top-Higgs FCNC Couplings

In this paper, we study the single top and Higgs associated production $pp \to thj$inthepresenceoftop-HiggsFCNCcouplings($\kappa_{tqh}, q=u,c$) at the LHC. Under the current constraints, we find that the cross section of $pp \to thj$ can be sizably enhanced in comparison with the SM predictions at 8 and 14 TeV LHC. We also find that the full cross section of $pp\to thj$ with ${\kappa }_{tch}$ is larger than the resonant cross section of $pp \to t\bar{t} \to thj$ by a factor 1.16 at 8 TeV LHC and 1.12 at 14 TeV LHC, respectively. We further explore the observability of top-Higgs FCNC couplings through $pp \to t(\to b\ell^{+} \nu_{\ell}) h( \to \gamma\gamma) j$ and find that the branching ratios $Br(t\to qh)$, $Br(t\to uh)$ and $Br(t\to ch)$ can be respectively probed to $0.12\mathrm{\%},0.23\mathrm{\%}$ and $0.26\mathrm{\%}$ at $3\sigma$ sensitivity at 14 TeV LHC with $\mathcal{L}=3000$ fb${}^{-1}$.