Complementary studies on $N^*$ from $e^+e^-$, $pp$ and $p\bar p$ collisions

TL;DR

This paper discusses how different collision experiments ($e^+e^-$, $pp$, $par p$) can provide unique insights into the properties and production mechanisms of $N^*$ resonances, complementing traditional methods.

Contribution

It highlights the potential of various collision types to study specific $N^*$ resonances and their couplings, offering new experimental avenues.

Findings

$e^+e^-$ collisions act as isospin filters for $N^*$ and related resonances.

$pp$ collisions are ideal for producing $ ho^+p$ coupled $ ext{Delta}^{*++}$.

$par p$ collisions are suited for studying $N^*$ with strong $\sigma N$ coupling.

Abstract

Complementary to the conventional experimental studies on $N^*$ from $\pi N$ and $\gamma^{(*)}N$ reactions, the $e^+e^-$, $pp$ and $p\bar p$ collisions can give novel insights into these $N^*$ resonances. While the $e^+e^-$ collisions through production and decay of vector charmonium $\psi$ provide a nice isospin filter for a simultaneously study of $N^*$, $\Delta^*$, $\Lambda^*$, $\Sigma^*$ and $\Xi^*$, the $pp$ collisions should be the best place for producing those $\Delta^{*++}$ with large coupling to $\rho^+p$ though $pp\to n\Delta^{*++}$ reaction, and the $p\bar p$ collisions should be the best place for looking for those $N^*$ with large coupling to $\sigma N$.