A Model for Pomeranchukon Couplings

We present a model for the Pomeranchukon which relates its couplings to those of the $f$ and $f^{\prime }$ trajectories. We successfully explain several features of total—cross-section data, and discuss $s$-channel helicity conservation at high energies in $\pi N$ scattering and $\rho$ photoproduction, but we do not expect it to be a feature of all diffractive processes.