# $K^0\Lambda$ Photoproduction with Nucleon Resonances

## TL;DR

This paper models the $K^0 \Lambda$ photoproduction process off neutrons using an effective Lagrangian and Regge approach, highlighting the importance of the $N(1685)$ resonance in matching experimental data.

## Contribution

It introduces a combined effective Lagrangian and Regge model to analyze $K^0 \Lambda$ photoproduction, emphasizing the role of the $N(1685)$ resonance.

## Key findings

- The $N(1685)$ resonance significantly improves data fit.
- The model reproduces total and differential cross sections.
- Resonance parameters are extracted from experimental data.

## Abstract

We investigate the reaction mechanism of $K^0 \Lambda$ photoproduction off the neutron target, i.e., $\gamma n \to K^0 \Lambda$, in the range of $W\approx 1.6-2.2$ GeV. We employ an effective Lagrangian method at the tree-level Born approximation combining with a Regge approach. As a background, the $K^*$-Reggeon trajectory is taken into account in the $t$ channel and $\Lambda$ and $\Sigma$ hyperons in the $u$-channel Feynman diagram. In addition, the role of various nucleon resonances listed in the Particle Data Group (PDG) is carefully scrutinized in the $s$ channel where the resonance parameters are extracted from the experimental data and constituent quark model. We present our numerical results of the total and differential cross sections and compare them with the recent CLAS data. The effect of the narrow nucleon resonance $N(1685,1/2^+)$ on cross sections is studied in detail and it turns out that its existence is essential in $K^0 \Lambda$ photoproduction to reproduce the CLAS data.