# Nucleon resonance production in the $\gamma p \to p\eta \phi$ reaction

## TL;DR

This study investigates nucleon resonance production in the gamma p to p eta phi reaction using an effective Lagrangian approach, highlighting the dominance of N*(1535) and the potential role of scalar meson exchange.

## Contribution

It introduces a detailed model considering multiple nucleon resonances and scalar meson exchange, providing new insights into reaction mechanisms and resonance contributions.

## Key findings

- N*(1535) dominates near threshold
- f0(980) exchange significantly contributes
- Parity asymmetry can identify scalar meson role

## Abstract

In this work, we perform a study of nucleon resonance production in the $\gamma p \to p\eta\phi$ reaction within an effective Lagrangian approach. In our model, we consider the excitation of the $N^*(1535)$, $N^*(1650)$, $N^*(1710)$ and $N^*(1720)$ in the intermediate state and the background term. We find that this reaction is dominated by the excitation of the $N^*(1535)$ in the near threshold region. Especially, we study the possible role of the scalar meson exchange in this reaction. It is found that the $f_0(980)$ exchange may give a significant contribution and the parity asymmetry can be used to identify its role in this reaction.