# Photoproduction of $K^{+}\Lambda$ with a Regge-plus-resonance model

## TL;DR

This paper develops a hybrid Regge-plus-resonance model to analyze kaon photoproduction off protons, fitting experimental data and exploring gauge-invariance schemes, with implications for understanding nucleon resonances and cross-section predictions.

## Contribution

The paper introduces a new gauge-invariance restoration scheme within the Regge-plus-resonance model for kaon photoproduction, improving data description and resonance analysis.

## Key findings

- Model fits experimental data well in resonance region
- Choice of gauge scheme affects forward-angle cross-section predictions
- Resonance overlaps with previous analyses and Bayesian results

## Abstract

Making use of the hybrid Regge-plus-resonance model, we investigate the process of kaon photoproduction off the proton target. We present a new model whose free parameters were adjusted to data in and above the resonance region and which provides an acceptable description of experimental data. The overwhelming majority of nucleon resonances selected in this analysis overlaps with those selected in our previous analyses and also with the Bayesian analysis with the Regge-plus-resonance model, which we deem to be dependable. A novel feature of our model consists in applying a different scheme for gauge-invariance restoration, which results in a need for implementing a contact current. As we further reveal, the choice of the gauge invariance restoration scheme as well as the choice of either pseudoscalar or pseudovector coupling in the strong vertex play a significant role for cross-section predictions at forward angles where data are scarce.