Is the Belle result for the cross section $σ (e^{+} e^{-} \to J / ψ + η_{c})$ a real difficulty for QCD?

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21 March 2005

journal article
research article
Published by Elsevier in Physics Letters B

Vol. 612 (3-4) , 215-222
https://doi.org/10.1016/j.physletb.2005.03.021

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