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 $J/\psi\to\gamma \overline pp$ and $e^+e^-\to\overline pp$ are interpreted by the strong $\overline pp$ interaction. Concerning the channel $J/\psi\to\gamma \overline pp$, the topic on the $\overline pp$ bound state is also discussed.