Study of the Magnetic Dipole Transition of $J/\psi \to \gamma {\eta }_c$ via ${\eta }_c\to p\bar{p}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +692

Using $(10.087\pm 0.044)\times 10^9$ $J/\psi$ events collected with the BESIII detector at the $e^{+}{e}^{-}$ BEPCII collider, we present the first amplitude analysis of $J/\psi \to \gamma p\bar{p}$ wit…