Using an improved Breit-Wigner model, the paper argues that complex pole residues are amplitude-level quantities, and shows how multi-resonance interference can make the Delta(1232) partial width appear to exceed its total width.
H¨ ohler,πNNewsletter9, 1 (1993)
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Resolving the $\Delta(1232)$ partial width anomaly: Complex pole residue is not a fundamental resonance property
Using an improved Breit-Wigner model, the paper argues that complex pole residues are amplitude-level quantities, and shows how multi-resonance interference can make the Delta(1232) partial width appear to exceed its total width.