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A sensitivity study for the measurement of the CKM angle $\gamma$ from$B^0_s\rightarrow \tilde{D}^{(*)0}\phi$ decays is performed using $D$ mesonreconstructed in the quasi flavour-specific modes $K\pi$, $K3\pi$, $K\pi\pi^0$,and \CP-eigenstate modes $KK$ and $\pi\pi$, where the notation $\tilde{D}^0$corresponds to a $D^0$ or a ${\tilde{D}^0}$ meson. The LHCb experiment is takenas a use case. A statistical uncertainty of about $8-19^{\circ}$ can beachieved with the $pp$ collision data collected by the LHCb experiment fromyear 2011 to 2018. The sensitivity to $\gamma$ should be of the order$3-8^{\circ}$ after accumulating 23\invfb of $pp$ collision data by 2025, whileit is expected to further improve with 300~fb$^{-1}$ by the second half of the2030 decade. The accuracy depends on the strong parameters $r^{(*)}_{B}$ and${\delta^{(*)}_{B}}$, describing, together with $\gamma$, the interferencebetween the leading amplitudes of the $B^0_s\rightarrow \tilde{D}^{(*)0}\phi$decays.

Study of CKM angle $\gamma$ sensitivity using flavor untagged $B^0_s\rightarrow \tilde{D}^{(*)0}\phi$ decays