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If there are two meson-baryon resonances or bound states with opposite parities but with the same remaining internal quantum numbers including signature, one at c.m. energy W₁ with l=J-1/2 and the other at W₂ with l=J+1/2, then the residue of the Regge trajectory on which they lie must change sign between W₁ and -W₂. Consequences of the exchange of such a trajectory to backward elastic scattering are discussed.
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Bipin R. Desai (1966) studied this question.
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