# Measurement of the Differential and Total Cross Sections of the ${\gamma}d \to K^0 {\Lambda} (p)$ Reaction within the Resonance Region

## TL;DR

This paper presents the first measurements of differential and total cross sections for the ${\gamma}d o K^0{\Lambda}(p)$ reaction, providing new experimental data to constrain nucleon resonance models and perform partial wave analysis.

## Contribution

It reports the first measurement of these cross sections over a broad energy range and compares them with theoretical models, aiding in understanding nucleon resonances.

## Key findings

- Data agree across two experimental runs, confirming measurement reliability.
- Discrepancies observed between data and KAON-MAID model at higher energies and forward angles.
- Partial wave analysis describes data without needing new resonances.

## Abstract

We report the first measurement of differential and total cross sections for the ${\gamma}d \to K^0{\Lambda}(p)$ reaction, using data from the CLAS detector at the Thomas Jefferson National Accelerator Facility. Data collected during two separate experimental runs were studied with photon-energy coverage 0.8 - 3.6 GeV and 0.5 - 2.6 GeV, respectively. The two measurements are consistent giving confidence in the method and determination of systematic uncertainties. The cross sections are compared with predictions from the KAON-MAID theoretical model (without kaon exchange), which deviate from the data at higher W and at forward kaon angles. These data, along with previously published cross sections for $K^+ {\Lambda}$ photoproduction, provide essential constraints on the nucleon resonance spectrum. A first partial wave analysis has been performed that describes the data without the introduction of new resonances.