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The mixing-induced CP-violating phase $\phi_s$ in ${B}^0_s$ and$\overline{B}^0_s$ decays is measured using the $J/\psi \pi^+\pi^-$ final statein data, taken from 3\,fb$^{-1}$ of integrated luminosity, collected with theLHCb detector in 7 and 8 TeV centre-of-mass $pp$ collisions at the LHC. Atime-dependent flavour-tagged amplitude analysis, allowing for direct \CPviolation, yields a value for the phase $\phi_s=70\pm 68\pm 8$\,mrad. Thisresult is consistent with the Standard Model expectation and previousmeasurements.

Measurement of the CP-violating phase $\phi_s$ in $\overline{B}^0_s\rightarrow J/\psi \pi^+\pi^-$ decays