Measuring the CP violation Phase $\gamma$ in open charm B decays at LHCb

This thesis presents the study of the measurement of the CKM angle $\gamma$ through two possible analysis at LHCb: first analysis, from the measurement of $B^0_s\rightarrow \tilde{D}^{(*)0}\phi$ decay, where the notation $\tilde{D}^{0}$ stands for either a $D^0$ or a $\overline{D}^0$ meson reconstructed in sub-decay mode: $K\pi\pi^0$, while the $\phi$ decays to $K^+K^-$; the second analysis, from the more conventional decay mode $B^-\rightarrow D^0K^{*-}$, where $D^0$ decays to $K^-\pi^+$ (RS), $K^-K^+$, $\pi^-\pi^+$, $\pi^-K^+$ (WS) and $K^{*-}$ is reconstructed in $K^-\pi^0$. Both measurements for the decay modes using proton-proton collision based on an integrated luminosity of $9.0fb^{-1}$ collected by the LHCb detector during Run 1 $\&$ Run 2, accumulated over years 2011 to 2018.