Improved measurement of $CP$ violation in $B_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays

LHCb collaboration, R. Aaij, M. Abdelfatah +1116

The time-dependent $CP$ asymmetry in $B_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays is measured using proton-proton collision data, corresponding to an integrated luminosity of $6\,\text…