  The $B_s^0-\bar{B}_s^0$ system can be used to look for new sources of CP
violation. Time-dependent CP violation measurements of beauty mesons allow the
determination of the mixing induced CP-violating phase, $\phi_s$. The angular
analysis of the $B_s^0\rightarrow \phi \phi$ decay is presented, along with two
$B_s^0\rightarrow J/\psi h^+h^-$ decays, where the two hadrons are either a
pair of kaons or a pair of pions. The analyses are based on data collected with
the LHCb detector between $2011$ and $2016$.
