On momentum dependence of the reaction $\pi^- p \to \omega n$ near   threshold
  We discuss the near-threshold behavior of the $\omega$ production amplitude in the reaction $\pi^-p \to \omega n$. In contrast to the results of earlier analyses we find that the averaged squared matrix element of the production amplitude must be a decreasing function of energy in order to describe the existing experimental data. 
C.Hanhart and A.Kudryavtsev