CP Violation in the $B^0_{(s)}$ Meson System at LHCb

Precision measurements of CP violation in processes involving neutral $B^0$ and $B^0_s$ mesons allow to probe beyond the boundaries of our current understanding of fundamental interactions as described by the Standard Model of particle physics. We present recent measurements of GP violation in the golden decay modes $B^0_s \to J/\psi K^+ K^-$ and $B^0 \to J/\psi K^0_s$ that exploit the full Run I dataset of $3fb^{-1}$ of $pp$ collisions at centre-of-mass energies of 7 and 8 TeV recorded with the LHCb experiment. Furthermore, CP violation measurements in $B^0_s \to J/\psi K^0_s$ and $B^0 \to J/\psi\pi^+\pi^-$ decays are presented, which allow to constrain the effects of higher-order Standard Model processes in the golden modes.