Antiproton-proton interaction and related hadron physics

Antinucleon-nucleon interaction has been established in chiral effective field theory. The strong threshold enhancement observed in the reactions $J\mathrm{/}\psi \to \gamma \bar{p}p$ and $e^{+}{e}^{-}\to \bar{p}p$ are interpreted by the strong $\bar{p}p$ interaction. Concerning the channel $J/\psi\to\gamma \overline pp$,thetopiconthe$\overline pp$ bound state is also discussed.