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Determination of the CP-violating phase s in B0s → J/ψ K+K− decays is one of the key goals of the LHCb experiment. Its value is predicted to be very small in the Standard Model but can be significantly enhanced in many other models. We present the most precise measurement of s to date and the first observation of a non-zero ΔΓs based upon 1 fb−1 of data collected at LHCb during 2011. Also the measurement of s with the decay mode B0s → J/ψπ+π− and a combination of the J/ψK+K− and J/ψπ+π− results are reported. Additionally we present first results from the measurement of the decay , which is potentially interesting for controlling currently neglected higher order corrections in B0s → J/ψK+K−.

Measurement of the CP-violating phase in B0smixing

Measurement of the CP-violating phase in B⁰_smixing