Measurements of the branching fractions of $\psi (3686)\to {\bar{\Sigma }}^0\Lambda +c.c.$ and ${\chi }_{cJ(J=0,1,2)}\to \Lambda \bar{\Lambda }$

BESIII Collaboration, M. Ablikim, M. N. Achasov +505

Based on $4.481\times 10^8$ $\psi (3686)$ events collected with the BESIII detector at BEPCII, the branching fraction of the isospin violating decay $\psi (3686)\to {\bar{\Sigma }}^0\Lambda +c.c.$…