Abstract
By constructing exact exchange-degenerate solutions of baryons with the harmonic-oscillator spectrum for a set of reactions MB→M′B′, MB → M′D′ and MD → M′D′, we investigate the duality constraints on the amplitude signs in MB → M′D′. It is shown that the amplitude signs determined by duality are consistent with those predicted by the extended version of SU(6) W symmetry with the universal dominance of the ΔL Z = 0 or ΔL Z = ±1 amplitude in the mesonic transitions of the baryons.
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