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The discovery of narrow resonances at 3. 1 and 3. 7 GeV and their interpretation as charmed quark-antiquark bound states suggest additional narrow states between 3. 0 and 4. 3 GeV. A model which incorporates quark confinement is used to determine the quantum numbers and estimate masses and decay widths of these states. Their existence should be revealed by -ray transitions among them.
Eichten et al. (Mon,) studied this question.
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