Antiproton-proton interaction and related hadron physics

TL;DR

This paper reviews the application of chiral effective field theory to antinucleon-nucleon interactions, explaining observed threshold enhancements and discussing potential antiproton-proton bound states.

Contribution

It demonstrates the use of chiral effective field theory for antinucleon-nucleon interactions and interprets experimental threshold enhancements within this framework.

Findings

Strong antiproton-proton interaction established

Threshold enhancements explained by interaction dynamics

Discussion on possible antiproton-proton bound states

Abstract

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.