Recent data compel us to interpret several peaks in the cross section of e^-e⁺ annihilation into hadrons as being due to the production of four-quark molecules, i.e., resonances between two charmed mesons. A rich spectroscopy of such states is predicted and may be studied in e^-e⁺ annihilation.
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Rújula et al. (1977) studied this question.
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