Complex amplitude phase motion in Dalitz plot heavy meson three body decay

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We propose a method to determine the phase motion of a complex amplitude in three body heavy meson decays. We show that the phase variation of a complex amplitude can be directly revealed through the interference observed in the Dalitz Plot region where it crosses with a well established resonant state. This method could be applied to the decays 3pi and D+→ K-π+π+, to determine whether the low mass states σ and κ, suggested by E791, have phase motions compatible with resonances.