An interaction among outgoing hadrons that changes the observed channel amplitude or its phase after the short-distance production vertex. Rescattering can mix channels with the same conserved quantum numbers. Consequently identical CKM suppression orders do not imply equal branching fractions, and a free-quark spectator diagram need not determine the ordering of exclusive hadronic decay rates.
A phase in a hadronic matrix element generated by strong interaction dynamics, including rescattering of final states. It does not change sign under conjugation of the weak coupling constant. Interference measurements depend on relative strong phases, rather than their common overall value.
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