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The discovery in the last few years of the $X, Y$ and $Z$ states of the extended charmonium family has highlighted the importance of the closeness of decay channels to an understanding of these mesons.
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The inclusion of charge conjugate channels is implied
Cited in the paper.
E. S. Swanson, Phys. Rept. 429
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W.-M. Yao et al
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E. J. Eichten, K. Lane and C. Quigg, Phys. Rev. D73
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