Results for dσ/dΩ and ${\mathit{A}}_{\mathit{N}}$ in the reaction p¯p→${\mathrm{\pi }}^{\mathrm{-}}$${\mathrm{\pi }}^{+}$ are predicted by a simple quark model. They are compared to recent experimental data from the CERN LEAR, as well as to previous predictions from nucleon-exchange models. At low energy the quark model does better than the nucleon-exchange models, but the overall comparison to experiment remains poor. In particular, the double-dip structure of the experimental ${\mathit{A}}_{\mathit{N}}$ data is only partly represented. This shortcoming of the simple quark model is traced back to a too small J=2 amplitude. This has interesting implications for the range of this specific annihilation process.

• Received 8 February 1993

DOI:https://doi.org/10.1103/PhysRevC.47.2207