New Isobar Models for $K^+\Lambda$ Electroproduction

TL;DR

This paper develops and fits two covariant isobar models for $K^+\Lambda$ electroproduction, incorporating numerous resonances and form factors, achieving good agreement with extensive experimental data.

Contribution

It introduces new isobar models with extensive resonance inclusion and alternative form factors, improving the description of kaon electroproduction processes.

Findings

Models fit nearly 2000 experimental data points.

Models show satisfactory consistency with experimental data.

Inclusion of multiple resonances enhances model accuracy.

Abstract

The electroproduction of kaon on proton has been studied using two covariant isobar models. The models incorporate propagators and vertex factors developed in our previous works. In total, the current study includes 26 nucleon resonances and 20 hyperon resonances, with spins up to 13/2. In the electromagnetic vertices, we consider two alternative electromagnetic form factors alongside the commonly used dipole model. The unknown parameters in the models, such as longitudinal coupling constants and form factor cutoffs, are determined by fitting the calculated observables to nearly 2000 experimental data points. The resulting models demonstrate satisfactory consistency with the available experimental data.