\begin{document}$gg\to H \to \gamma\gamma$\end{document} and \begin{document}$gg\to \gamma\gamma$\end{document} is almost antisymmetric around the Higgs mass \begin{document}$M_H$\end{document}. We propose a new observable \begin{document}$A_{\rm{int}}$\end{document}, the ratio of the sign-reversed integral around \begin{document}$M_H$\end{document} (e.g. \begin{document}$\int^{M_H}_{M_H-5~\rm{GeV}} -\int_{M_H}^{M_H+5~\rm{GeV}}$\end{document}) and the cross-section of the Higgs signal, to quantify this effect. We study \begin{document}$A_{\rm{int}}$\end{document} both in the Standard Model (SM) and new physics with various CP violating \begin{document}$H\gamma\gamma$\end{document} couplings. \begin{document}$A_{\rm{int}}$\end{document} in SM could reach a value of 10%, while for CP violating \begin{document}$H\gamma\gamma$\end{document} coupling \begin{document}$A_{\rm{int}}$\end{document} could range from 10% to −10%, which could probably be detected in the HL-LHC experiments. \begin{document}$A_{\rm{int}}$\end{document} with both CP violating \begin{document}$H\gamma\gamma$\end{document} and \begin{document}$Hgg$\end{document} couplings is also studied, and its range of values is found to be slightly larger."> Probing the CP violating <i>Hγγ</i> coupling using interferometry -
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