Study of the Magnetic Dipole Transition of $J/ψ→γ{η}_{c}$ via ${η}_{c}→p\overline{p}$

Author(s): M. Ablikim et al. (BESIII Collaboration) Using $(10.087±0.044)×{10}^{9}\text{ }\text{ }J/ψ$ events collected with the BESIII detector at the ${e}^{+}{e}^{−}$ BEPCII collider, we present the first amplitude analysis of $J/ψ→γp\overline{p}$ with the $p\overline{p}$ invariant mass in the ${η}_{c}$ mass region $[2.70,3.05]\text{ }\text{ }\math… [Phys. Rev. Lett. 136, 051901] Published Tue Feb 03, 2026