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The measurement of the mixing-induced CP-violating phase $\phi_s$ in the$B^0_s - \bar{B}^0_s$ system is one of the key goals of the LHCb experiment,and provides an excellent opportunity to search for New Physics beyond StandardModel. Using Run-I data, $\phi_s$ has been measured in several decay channels.These proceedings briefly summarise the previous LHCb Run-I results of $\phi_s$measurement, and show the most recent results obtained by analysing the decaychannel $B^0_s \to J/\psi K^+ K^-$ in the $K^+ K^-$ mass region above the$\phi$(1020) resonance.

Measurements of the CP violating phase $\phi_s$ at LHCb