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The great progress made recently in the sector of Flavor Physics has enabledto establish CP violation in the B-meson decays. The unitarity triangle derivedfrom the unitarity relation $V_{ub}^* V_{ud} + V_{cb}^* V_{cd} + V_{tb}^*V_{td} = 0$ has been measured very precisely. To further asses ourunderstanding of CP violation, it would be useful to carry out similarmeasurement of other triangles. In this note, we investigate the trianglederived from the relation $V_{ub}^* V_{us} + V_{cb}^* V_{cs} + V_{tb}^* V_{ts}= 0$. Two angles of this triangle ($\alpha_s$ and $\beta_s$) could be measuredvery accurately at FCCee using the decays $B_s(\overline{B_s})\rightarrowD^\pm_sK^\mp$ and $B_s(\overline{B_s})\rightarrow J/\psi \phi$ respectively, asdiscussed elsewhere by us. This note concentrates on the measurement of thethird angle $\gamma_s$ using the modes $B^\pm \to \overline{D^0}(D^0)K^\pm$. Weshow that a direct measurement of the angle $\gamma_s$ is possible with somespecific $B^\pm$ decays with an estimated resolution of the order of 1$^\circ$.

Study of CP violation in $B^\pm$ decays to $\overline{D^0}(D^0) K^\pm$ at FCCee