Observation of the Electromagnetic Radiative Decays of the $\mathrm{Λ}(1520)$ and $\mathrm{Λ}(1690)$ to $γ{\mathrm{Σ}}^{0}$

Author(s): M. Ablikim et al. (BESIII Collaboration) Using $(10087±44)×{10}^{6}\text{ }\text{ }J/ψ$ events collected with the BESIII detector, we present a study of resonant structures in the $J/ψ→\mathrm{Λ}\overline{\mathrm{Λ}}γ$ and $\mathrm{Λ}{\overline{\mathrm{Σ}}}^{0}γ$ processes, reporting the first observation of the electromagnetic radiative … [Phys. Rev. Lett. 136, 141801] Published Wed Apr 08, 2026