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The recently discovered narrow charmonium resonance near 3870 MeV is interpreted as a hadronic molecule whose constituents are the charm mesons D^0 and D^*0 or D^0 and D^*0. Because of an accidental fine-tuning of the molecule to very near the D^0D^*0 threshold, it has some universal properties that are completely determined by the unnaturally large D^0D^*0 scattering length a. Its narrow width can be explained by the suppression by a factor of 1/a of decay modes other than the decay of a constituent D^*0 or D^*0. Its production rates are also suppressed by a factor of 1/a. A particularly predictive mechanism for generating the large scattering length is the accidental fine-tuning of a P-wave charmonium state to the D^0D^*0 threshold.
Braaten et al. (Thu,) studied this question.