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

A sensitivity study for the measurement of the CKM angle $γ$ from $B^0_s\rightarrow \tilde{D}^{(*)0}ϕ$ decays is performed using $D$ meson reconstructed in the quasi flavour-specific modes $Kπ$, $K3π$, $Kππ^0$, and \CP-eigenstate modes $KK$ and $ππ$, where the notation $\tilde{D}^0$ corresponds to a $D^0$ or a ${\tilde{D}^0}$ meson. The LHCb experiment is taken as a use case. A statistical uncertainty of about $8-19^{\circ}$ can be achieved with the $pp$ collision data collected by the LHCb experiment from year 2011 to 2018. The sensitivity to $γ$ should be of the order $3-8^{\circ}$ after accumulating 23\invfb of $pp$ collision data by 2025, while it is expected to further improve with 300~fb$^{-1}$ by the second half of the 2030 decade. The accuracy depends on the strong parameters $r^{(*)}_{B}$ and ${δ^{(*)}_{B}}$, describing, together with $γ$, the interference between the leading amplitudes of the $B^0_s\rightarrow \tilde{D}^{(*)0}ϕ$ decays.

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