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In view of the proliferation in the number of new charmonium states, it isreally important to have a experimental way to prove that an observed bump is,indeed, a real resonance. To do that, in this paper we present an alternativemethod to demonstrate the resonant behavior of a state. With this method, thephase variation of a generic complex amplitude can be directly revealed throughinterference in the Dalitz-plot region where it crosses a well establishedresonant state, used as a probe. We have tested the method for the $Z^-(4430)$state by generating Monte Carlo samples for the $B^0\to \psi^\prime \pi^-K^+$decay channel. We have shown that the proposed method gives a clear oscillationbehavior, related to the phase variation associated to a real resonant state,in the case where the $Z^-(4430)$ is considered as a regular resonance with astrong phase variation. We have also discussed the possibility of using theproposed method complementary to the Argand diagram to determine the internalstructure of the $Z^-(4430)$ state.

Phase motion in the $Z^-(4430)$ amplitude in $B^0\to\psi^\prime\pi^-K^+$ decay