Beam-Target Helicity Asymmetry $E$ in $K^{0}\Lambda$ and $K^{0}\Sigma^0$ Photoproduction on the Neutron

TL;DR

This paper presents the first measurements of the beam-target helicity asymmetry $E$ in $K^{0}\Lambda$ and $K^{0}\Sigma^0$ photoproduction on the neutron, providing new data to distinguish isospin transition amplitudes in meson photoproduction.

Contribution

It introduces the first measurements of the $E$ asymmetry in these channels, using advanced analysis and polarization techniques, to improve understanding of isospin amplitudes.

Findings

First $E$ asymmetry measurements for these channels.

Comparison with theoretical models like KaonMAID, SAID, Bonn-Gatchina.

Data will aid in separating isospin $I=0$ and $I=1$ amplitudes.

Abstract

We report the first measurements of the $E$ beam-target helicity asymmetry for the $\vec{\gamma} \vec{n} \to K^{0}\Lambda$, and $K^{0}\Sigma^{0}$ channels in the energy range 1.70$\leq W\leq$2.34 GeV. The CLAS system at Jefferson Lab uses a circularly polarized photon beam and a target consisting of longitudinally polarized solid molecular hydrogen deuteride with low background contamination for the measurements. The multivariate analysis method boosted decision trees was used to isolate the reactions of interest. Comparisons with predictions from the KaonMAID, SAID, and Bonn-Gatchina models are presented. These results will help separate the isospin $I=0$ and $I=1$ photo-coupling transition amplitudes in pseudoscalar meson photoproduction.