Observation of $\psi (3686)\to e^{+}{e}^{-}{\chi }_{cJ}$ and ${\chi }_{cJ}\to e^{+}{e}^{-}J/\psi$

M. Ablikim, M. N. Achasov, X. C. Ai +420

Using $4.479\times 10^8$ $\psi (3686)$ events collected with the BESIII detector, we search for the decays $\psi (3686)\to e^{+}{e}^{-}{\chi }_{c0,1,2}$ and $χ_{c0,1,2} \rightarrow e^{…