\begin{document}$t\bar{t}H$\end{document} production at the 14 TeV Large Hadron Collider (LHC). We consider two decay modes of the Higgs boson, \begin{document}$H\to b\bar{b}$\end{document} and \begin{document}$H\to \gamma\gamma$\end{document}, and demonstrate that the dihedral angle distribution is able to distinguish between the CP-even and the CP-odd hypothesis at a 95% confidence level, with an integrated luminosity of \begin{document}$\sim 180~{\rm{fb}}^{-1}$\end{document}."> New observable for measuring the CP property of top-Higgs interaction -
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