Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-06-28
Phys.Rev.D78:054022,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages with 4 figures
Scientific paper
10.1103/PhysRevD.78.054022
We study the observed enhancement of a $p\bar p$ system near the threshold in the process $J/\psi \to \gamma p\bar p$ 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 $\pi$ is the most important. The effects of the rescattering is completely fixed by the well-known coupling $g_{\pi NN}$. Our results show that the enhancement in $J/\psi \to \gamma p\bar p$ and $e^+ e^- \to p\bar p$ can be well described with the rescattering effects.
Chen Guan Yeu
Dong Hai-Rong
Ma Jian-Ping
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