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On the failure of the $12\%$ rule in $J/ψ$ and $ψ(2S)$ decays
The $12\%$ rule relates hadronic decays of the $J/ψ$ and $ψ(2S)$ through the ratio of their wave functions at the origin, but is strongly violated in several vector--pseudoscalar ($VP$) channels, most prominently in the $ρπ$ one. We study these decays within an effective chiral framework including s
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