A new measurement of Beam Asymmetry in Pion Photoproduction from the Neutron using CLAS

TL;DR

This paper reports a preliminary measurement of photon beam asymmetry in pion photoproduction from the neutron using the CLAS detector, aiming to improve understanding of neutron excitation spectrum with new, extensive data.

Contribution

It introduces new experimental data on beam asymmetry in neutron pion photoproduction, expanding the energy and angular coverage of existing measurements.

Findings

Provides initial data on photon beam asymmetry (Sigma)

Enhances the neutron excitation spectrum understanding

Expands the dataset in energy and angle ranges

Abstract

We present a preliminary analysis of the photon beam asymmetry observable (Sigma) from the photoproduction reaction channel gamma+ n -> p + pi-. This new data was obtained using the near-4pi CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory, USA, employing a linearly polarised photon beam with an energy range 1.1 - 2.3 GeV. The measurement will provide new data to address the poorly established neutron excitation spectrum and will greatly expand the sparse world data-set both in energy and angle.