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

LHCb collaboration, R. Aaij, B. Adeva +697

The mixing-induced CP-violating phase ${\varphi }_s$ in $B_s^0$ and ${\overline{B}}_s^0$ decays is measured using the $J/\psi {\pi }^{+}{\pi }^{-}$ final state in data, taken from 3\,fb${}^{-1}$ of integrated…