  In order to establish links between p-wave pion production in nucleon-nucleon
collisions and low energy three-nucleon scattering, an extensive programme of
experiments on pion production is currently underway at COSY-ANKE. The final
proton pair is detected at very low excitation energy, leading to an S-wave
diproton, denoted here as {pp}_s. We now report on measurements of the
differential cross section and analysing power of the pol{p}p->{pp}_s pi^0$
reaction at 353 MeV. Both observables can be described in terms of s- and
d-wave pion production and, by using the phase information from elastic pp
scattering, unique solutions can be obtained for the corresponding amplitudes.
This information is vital for the partial wave decomposition of the
corresponding pn->{pp}_s pi^- reaction and hence for the extraction of the
p-wave terms.
