Abstract
The recent measurements by the BES Collaboration of $J/\ensuremath{\psi}$ decays into $\ensuremath{\gamma}p\overline{p}$ indicate a strong enhancement at $p\overline{p}$ threshold not observed in the decays into ${\ensuremath{\pi}}^{0}p\overline{p}$. Is this enhancement due to a $p\overline{p}$ quasibound state or a baryonium? A natural explanation follows from a traditional model of $p\overline{p}$ interactions based on the G-parity transformation. The observed $p\overline{p}$ structure is due to a strong attraction in the ${}^{1}{S}_{0}$ state and possibly to a near-threshold quasibound state in the ${}^{11}{S}_{0}$ wave.
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