Observation of muonic Dalitz decays of $\ddot{I}{‡}_b$ mesons and precise spectroscopy of hidden-beauty states

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1117

The decays of the $\ddot{I}{‡}_{b1}(1P)$, $\ddot{I}{‡}_{b2}(1P)$, $\ddot{I}{‡}_{b1}(2P)$ and $\ddot{I}{‡}_{b2}(2P)$ mesons into the $\hat{I}\yen (1S)\hat{I}{¼}^{+}\hat{I}{¼}^{-}$ final state are observed with a high significance using proton-prot…