Isoscalar amplitude dominance in $e^+e-$ annihilation to $N\bar{N}$ pair close to the threshold

TL;DR

This paper demonstrates that the Paris optical potential explains experimental data for electron-positron annihilation into proton-antiproton pairs near threshold, highlighting the dominance of the isoscalar amplitude over the isovector.

Contribution

It introduces the use of the Paris nucleon-antinucleon optical potential to successfully model near-threshold $e^+e^- ightarrow par p$ data, emphasizing isoscalar dominance.

Findings

Final-state interaction reproduces experimental data

Isoscalar form factor is significantly larger than isovector

Supports the dominance of isoscalar amplitude near threshold

Abstract

We use the Paris nucleon-antinucleon optical potential for explanation of experimental data in the process $e^+e^- \rightarrow p\bar p$ near threshold. It turns out that final-state interaction due to Paris optical potential allows us to reproduce available experimental data. It follows from our consideration that the isoscalar form factor is much larger than the isovector one.