2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/204117We study the observed enhancement of a $p\bar p$ system near the threshold in the process $J/ψ\to γp\bar p$ and $e^+ e^- \to p\bar p$. From early studies the enhancement can be explained by final state interactions, which are in general taken into account with some potential models. In this work we offer a simple approach within quantum field theory to explain the observed enhancement. We point out that among different final state interactions the rescattering in a $N\bar N$ system though exchange of $π$ is the most important. The effects of the rescattering is completely fixed by the well-known coupling $g_{πNN}$. Our results show that the enhancement in $J/ψ\to γp\bar p$ and $e^+ e^- \to p\bar p$ can be well described with the rescattering effects.11 pages with 4 figuresHigh Energy Physics - Phenomenologytext