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Open charm effects in the explanation of the long-standing “<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ρ</mml:mi><mml:mi>π</mml:mi></mml:math>puzzle”
A detailed analysis of the open charm effects on the decays of $J/\ensuremath{\psi}({\ensuremath{\psi}}^{\ensuremath{'}})\ensuremath{\rightarrow}VP$ is presented, where $V$ stands for light vector meson and $P$ for light pseudoscalar meson. These are the channels that the so-called ``12% rule'' of perturbative QCD (pQCD) is obviously violated. Nevertheless, they are also the channels …