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

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.