Mixing and time-dependent CP violation in beauty at LHCb

Abstract: Recent measurements of the time-dependent CP violation are presented. The decays of $B_{s}^{0}$ mesons to $J/\psi\,K^+ K^-$ and $J/\psi\,\pi^+ \pi^-$ final states are used to measure CP-violating parameters with proton-proton collision data, corresponding to an integrated luminosity of 1.9 fb$^{-1}$, collected by the LHCb detector at a centre-of-mass energy of 13 TeV in 2015 and 2016.