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Decays of $B_{s}^{0}$ and $\overline{B}{}_{s}^{0}$ mesons into$J/\psi\pi^+\pi^-$ final states are studied in a data sample corresponding to1.9 fb$^{-1}$ of integrated luminosity collected with the LHCb detector in 13TeV $pp$ collisions. A time-dependent amplitude analysis is used to determinethe final-state resonance contributions, the $CP$-violating phase$\phi_s=-0.057\pm 0.060\pm 0.011$ rad, the decay-width difference between theheavier mass $B_{s}^{0}$ eigenstate and the $B^{0}$ meson of $-0.050\pm0.004\pm 0.004$ ps$^{-1}$, and the $CP$-violating parameter$|\lambda|=1.01_{-0.06}^{+0.08}\pm0.03$, where the first uncertainty isstatistical and the second systematic. These results are combined with previousLHCb measurements in the same decay channel using 7 TeV and 8 TeV $pp$collisions obtaining $\phi_s =0.002\pm0.044\pm0.012$ rad, and $|\lambda|=0.949\pm0.036\pm0.019$.

Measurement of the $CP$-violating phase $\phi_s$ from $B_{s}^{0}\to J/\psi\pi^+\pi^-$ decays in 13 TeV $pp$ collisions