Nucleon resonances in the $\gamma p \to \phi K^+ \Lambda$ reaction near threshold

TL;DR

This study analyzes the $ ightarrow$ reaction near threshold using an effective Lagrangian approach, highlighting the dominant role of the $N^*(1535)$ resonance and proposing it as a new platform for resonance study.

Contribution

It introduces a detailed theoretical analysis of the $ ightarrow$ reaction near threshold, emphasizing the significance of the $N^*(1535)$ resonance and providing predictions for future experimental tests.

Findings

The $N^*(1535)$ resonance dominates the reaction near threshold.

Predicted total cross sections align with potential experimental measurements.

Angular distribution features can distinguish resonance contributions.

Abstract

We investigate the $\gamma p \to \phi K^+ \Lambda$ reaction near threshold within an effective Lagrangian approach and the isobar model. Various nucleon resonances caused by the $\pi$ and $\eta$ meson exchanges and background contributions are considered. It is shown that the contribution from the $N^*(1535)$ resonance caused by the $\eta$ meson exchange plays the predominant role. Hence, this reaction provides a good new platform to study the $N^*(1535)$ resonance. The predicted total cross section and specific features of angular distributions can be tested by future experiments.