Features of $\pi \Delta$ Photoproduction at High Energies

TL;DR

This paper develops a high-energy $\u2206$ photoproduction model incorporating pion absorption and natural-parity contributions, fitting existing data and predicting photon beam asymmetries for upcoming experiments.

Contribution

It introduces a comprehensive model for $\u2206$ photoproduction at high energies, aligning well with experimental data and providing new predictions for future measurements.

Findings

Good fit to energy and angular data

Predictions for photon beam asymmetry at 9 GeV

Model includes both pion absorption and natural-parity effects

Abstract

Hybrid/exotic meson spectroscopy searches at Jefferson Lab require the accurate theoretical description of the production mechanism in peripheral photoproduction. We develop a model for $\pi\Delta$ photoproduction at high energies ($5 \leq E_{\text{lab}} \leq 16~\text{GeV}$) that incorporates both the absorbed pion and natural-parity cut contributions. We fit the available observables, providing a good description of the energy and angular dependencies of the experimental data. We also provide predictions for the photon beam asymmetry of charged pions at $E_{\text{lab}} = 9~\text{GeV}$ which is expected to be measured by GlueX and CLAS12 experiments in the near future.