Helicity amplitude and branching fraction measurement of ${\chi }_{cJ}\to \Lambda \bar{\Lambda }$

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

Utilizing $2712.4\pm 14.3$ million $\psi (3686)$ events accumulated by the BESIII experiment, we perform a partial wave analysis of $\psi (3686)\to \gamma {\chi }_{cJ}\to \gamma \Lambda \bar{\Lambda }$ decay…