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The ratio of $K_S K_S$ ($K_L K_L$) and $K_S K_L$ production rates iscalculated by considering $K^0 - K^0bar$ oscillation in $J/\psi \to K^0K^0bar$decay. The theoretical uncertainty due to strong interaction in $J/\psi$ decayis completely canceled in the ratio, therefore, the absolute branchingfractions of the \CP violating processes of $J/\psi \to K_S K_S $ and $K_L K_L$can be cleanly and model-independently determined in case that $J/\psi \to K_SK_L$ decay is precisely measured. In the future $\tau$-Charm factory, theexpected \CP violating process of $J/\psi \to K_S K_S $ should be reached. Itis important to measure $J/\psi$ to $K_S K_S$ and K_S K_L decayssimultaneously, so that many systematic errors will be canceled. More precisemeasurements are suggested to examine the predicted isospin relation in $J/\psi\to KKbar$ decays. All results can be extended to decays of other vectorquarkonia, $\phi$, $\psi(2S)$ and $\Upsilon(1S)$ and so on.Comment: Version 2 is the same as published one at PR

physical review letters

Clean Prediction of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>-Violating Processes<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ψ</mml:mi></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ϕ</mml:mi></mml:math>, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Υ</mml:mi><mml:mo stretchy="false">(</mml:mo…

Clean Prediction ofCP-Violating Processesψ,ϕ, andΥ(