Study of N*(1440) from J/Psi Decays

Abstract

For $J/\Psi \to \bar{p}p{\pi }^0$ and $\bar{p}p{\pi }^{+}{\pi }^{-}$, the ${\pi }^{0}p$ and $p{\pi }^{+}{\pi }^{-}$ systems are limited to be pure isospin 1/2 due to isospin conservation. This is a big advantage in studying $N^{\ast }$ resonances from $J/\Psi$ decays, compared with $\pi N$ and $\gamma N$ experiments. The process $J/\Psi \to \bar{p}{N}^{\ast }$ or $p{\bar{N}}^{\ast }$ provides a new way to probe the internal structure of the $N^{\ast }$ resonances. Here we report a quark model calculation for $J/\Psi \to \bar{p}p$, $p{N}^{\ast }(1440)$ and ${\bar{N}}^{\ast }{N}^{\ast }$. The implication for the internal structure of $N^{\ast }(1440)$ is discussed.