Observation of $CP$ violation in $B^0\to J/\psi \rho (770{)}^0$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1172

The time-dependent $CP$ asymmetry in $B^0\to J/\psi \rho (770{)}^0$ decays is measured using proton-proton collision data corresponding to an integrated luminosity o…