Determination of the angle $γ$ from nonleptonic $B_c \to D_s D^0$ decays

We note that the two body nonleptonic pure tree decays $B_c^\pm \to D_s^\pm D^0(\bar D^0)$ and the corresponding vector-vector modes $B_c^\pm \to D_s^{* \pm} D^{*0}(\bar D^{* 0})$ are well suited to extract the weak phase $γ$ of the unitarity triangle. The CP violating phase $γ$ can be determined cleanly as these decay modes are free from the penguin pollutions.

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