Measurement of $CP$ violation in $B^0\to J/\psi K_{\mathrm{S}}^0$ and $B^0\to \psi (2S)K_{\mathrm{S}}^0$ decays

LHCb collaboration, R. Aaij, B. Adeva +797

A measurement is presented of decay-time-dependent $CP$ violation in the decays $B^0\to J/\psi K_{\mathrm{S}}^0$ and $B^0\to \psi (2S)K_{\mathrm{S}}^0$, where the $J/\psi$ is reco…