Duality and Diffraction Dissociation

We discuss diffraction dissociation in the context of a dual model. We show how direct-channel resonances in the Pomeranchukon-particle amplitude build the Pomeranchukon in the crossed channel. A result of the enforcement of the Harari-Freund conjecture for particle-particle amplitudes is that the Pomeranchukon-Pomeranchukon-Reggeon coupling is small. The model is tested phenomenologically by the analysis of ${\pi }^{-}p\to {\pi }^{-}p\left({\pi }^{+}{\pi }^{-}\right)$ of Lipes, Robertson, and Zweig and by baryon missing-mass data at various energies. It is also tested phenomenologically by the behavior of missing-mass diffraction production peaks, which are predicted to level off or dip near the forward direction as a consequence of the vanishing of the triple-Pomeranchukon coupling.