We report a measurement of the spin-dependent total cross section ratios delta_sigma_T/sigma_tot and delta_sigma_L/sigma_tot of the pp --> pp pi^0 reaction between 325 MeV and 400 MeV. The experiment was carried out with a polarized internal target in a storage ring. Non-vertical beam polarization was obtained by the use of solenoidal spin rotators. Near threshold, the knowledge of both spin-dependent total cross sections is sufficient to deduce the strength of certain participating partial waves, free of any model.
@article{arxiv.nucl-ex/9907017,
title = {Measurement of Partial-Wave Contributions in pp --> pp pi^0},
author = {H. O. Meyer and J. T. Balewski and J. Doskow and R. E. Pollock and B. v. Przewoski and T. Rinckel and P. Thorngren-Engblom and A. Wellinghausen and W. Haeberli and B. Lorentz and F. Rathmann and B. Schwartz and T. Wise and W. W. Daehnick and Swapan K. Saha and P. V. Pancella},
journal= {arXiv preprint arXiv:nucl-ex/9907017},
year = {2009}
}