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We demonstrate that the dip observed near the total energy of 3872 MeV in the recent cross section data from the BESIII Collaboration for e^+e^- J/^+^- admits a natural explanation as a coupled-channel effect: it is a consequence of unitarity and a strong S-wave D D^* attraction that generates the state X (3872). We anticipate the appearance of a similar dip in the e^+e^- J/^+^-⁰ final state near the D^*D^* threshold driven by the same general mechanism, then to be interpreted as a signature of the predicted spin-two partner of the X (3872).
Baru et al. (Thu,) studied this question.
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