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Manifestation of intermediate meson loop effects in charmonium decays

We report the progress on understanding some of those existing puzzles in charmonium decays. We show that the intermediate meson loops (IML) as a long-distance transition mechanism will provide novel insights into these issues. In particular, we show that the IML mechanism would be essentially important for understanding the Ψ(3770) non-DD̄ decays. We also comment that such a mechanism is correlated with the Okubo–Zweig–Iizuka (OZI) rule evasions in charmonium hadronic decays.