Spin correlation coefficients in from 325 to 400 MeV

Abstract The spin correlation coefficient combinations S ≡ A xx + A yy , D ≡ A xx − A yy and the analyzing powers A y ( θ ) were measured for p → p → →pnπ + at beam energies of 325, 350, 375 and 400 MeV. A polarized internal atomic hydrogen target and a stored, polarized proton beam were used. These polarization observables are sensitive to contributions of higher partial waves. A comparison with recent theoretical calculations is provided.