On momentum dependence of the reaction ${\pi }^{-}p\to \omega n$ near threshold

Abstract

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.

Comments: 9 pages, 2 figures, several editorial changes, the treatment of small final momenta is improved, final conclusion unchanged. Submitted to Eur. Phys. J. A