Helicity amplitude and branching fraction measurement of $\ddot{I}{‡}_{cJ}\to \hat{I}›\bar{\hat{I}}›$

BESIII Collaboration, M. Ablikim, M. N. Achasov +689

Utilizing $2712.4\pm 14.3$ million $\ddot{I}ˆ(3686)$ events accumulated by the BESIII experiment, we perform a partial wave analysis of $ψ(3686)\rightarrowγχ_{cJ}\rightarrowγΛ\barΛ…