Helicity Asymmetry Measurement for $\pi^0$ Photoproduction on the CLAS Frozen Spin Target

TL;DR

This paper reports the measurement of helicity asymmetry in neutral pion photoproduction using polarized photon and proton targets, providing data to test and refine partial-wave analyses in nuclear physics.

Contribution

It presents new experimental data on helicity asymmetry E for $ o o o$ reactions at specific energies, aiding the understanding of nucleon resonance structures.

Findings

Helicity asymmetry E measured across 1450-2050 MeV.

Results compared with SAID, MAID, and BnGa analyses.

Data constrains theoretical models of pion photoproduction.

Abstract

The measurement was performed with circularly polarized photons incident on longitudinally polarized target in Hall B at the Thomas Jefferson National Accelerator Facility. The helicity asymmetry E for $\vec{\gamma}\vec{p}\to\pi^0p$ was determined at CM energies between 1450 MeV and 2050 MeV and compared to the SAID, MAID, and BnGa partial-wave analyses.