Analyzing power measurements in pion-deuteron breakup at intermediate energies

As part of an experimental study of the NN system, the pion-deuteron breakup reaction +d pn+ was investigated at intermediate energies. Distributions of the vector analyzing power iT11 versus outgoing proton momentum Pp are presented for 36 p angle pairs in the range of scattering angles 20°p51°, 62°124°at 228 and 134 MeV. These include 7 previously unmeasured angle pairs at 228 MeV and 20 new pairs at 134 MeV. In all regions of overlap with previous measurements, there is excellent agreement. There is generally excellent agreement with relativistic Faddeev predictions, except in the np final-state interaction region at 228 MeV. This is in contrast to the cross-section measurements, which are not well described by the theory.