First measurement of the polarization observable $E$ and helicity-dependent cross sections in single ${\pi }^0$ photoproduction from quasi-free nucleons

M. Dieterle, L. Witthauer, F. Cividini +84

The double-polarization observable $E$ and the helicity-dependent cross sections ${\sigma }_{1/2}$ and ${\sigma }_{3/2}$ have been measured for the first time for single ${\pi }^0$ photoproduction fr…