Improved measurement of $\hat{I}\cdot /\hat{I}{\cdot }^{\prime }$ mixing in $B_{(s)}^0\to J/\ddot{I}ˆ\hat{I}{\cdot }^{(\prime )}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1182

Branching fraction ratios between the decays $B_{(s)}^0\to J/\ddot{I}ˆ\hat{I}{\cdot }^{(\prime )}$ are measured using proton-proton collision data collected by the LHCb experiment at centre-…