Implications of Missing-Mass Experiments for Regge Cuts

The impact of the empirical features of missing-mass spectra on Regge cuts is studied. The measured processes $a+p\to X+p$ ($a={\pi }^{-},p$) indicate a large diffractive component in certain Reggeon-particle amplitudes which may crucially affect the structure of the corresponding cuts. This diffractive term essentially measures the possible deviation from results for cuts derived in models with resonances only, such as the Finkelstein selection rules which are based on duality-diagrams considerations. Additional results for cuts are pointed out from the observed weak coupling of the Pomeranchon to large masses.