Polarization components in $\pi^{0}$ photoproduction at photon energies up to 5.6 GeV

Understand

We present new data for the polarization observables of the final state proton in the $^{1}H(\vec{\gamma},\vec{p})\pi^{0}$ reaction.

• These data can be used to test predictions based on hadron helicity conservation (HHC) and perturbative QCD (pQCD).
• These data have both small statistical and systematic uncertainties, and were obtained with beam energies between 1.8 and 5.6 GeV and for $\pi^{0}$ scattering angles larger than 75$^{\circ}$ in center-of-mass (c.m.) frame.
• The data extend the polarization measurements data base for neutral pion photoproduction up to $E_{\gamma}=5.6 GeV$.