A recent experiment has measured analyzing powers in d(p→,${\mathrm{\pi }}^{\mathrm{-}}$pp)p in a geometry which selected the quasifree two-body reaction p→n→${\mathrm{\pi }}^{\mathrm{-}}$pp${(}^1$${\mathit{S}}_0$). Analysis of the results indicated a significant contribution from a very-short-range part of the nucleon-nucleon interaction. We show that the analyzing power data measured in the above experiment is reasonably well described by a unitary NN → NNπ model containing only the one-pion-exchange driving force.

• Received 6 June 1990

DOI:https://doi.org/10.1103/PhysRevC.42.1751