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The hierarchy among the radiative $\gamma$($\pi^0$, $\eta$, $\eta^{\prime}$) decay channels for the $\psi^{\prime}$ looks quite different from the $J/\psi$ one.
Phys. Lett. 5
S. Okubo, · 1963
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J. Iizuka, · 1966
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Nucl. Phys. B72
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Origins of the quark model,
G. Zweig, · 1980
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Phys. Lett. B462
J.-M. Gerard and J. Weyers, · 1999
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Phys. Lett. B616
J.-M. Gerard and E. Kou, · 2005
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Phys. Lett. B628
P. Artoisenet, J.-M. Gerard, and J. Weyers, · 2005
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hep-ph/0611214 (2006)
X.-H. Mo, C.-Z. Yuan, and P. Wang, · 2006
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Q. Zhao, G. Li, and C.-H. Chang, · 2007
Later among the works it cites.
JHEP 0905
C. Degrande and J.-M. Gerard, · 2009
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Phys. Rev. Lett. 105
M. Ablikim et al · 2010
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Phys. Rev. D86
J. Beringer et al · 2012
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