Recent LHCb results on CP violation in beauty decays to charmonia

The latest three results from LHCb with decays of B-mesons to charmonia states are presented. The first measurement of the CP-violating phase \(\phi_s\) in the decay with electrons \(B_s^0 \to J/\psi (\to e^+ e^-) \phi\) is shown. Results of an updated search of the rare decay \(B^0 \to J/\psi \phi\) are given. A precise measurement of the fragmentation fraction ratio of \(B_s^0\) and \(B^0\), \(f_s/f_d\), extracted from a combination of most up-to-date LHCb results is reported.