On supersymmetric contributions to theCPasymmetry of theB→φKSprocess

We analyze the CP asymmetry of the $\overrightarrow{B}\phi K_S$ process in general supersymmetric models. In the framework of the mass insertion approximation, we derive model independent limits for the mixing CP asymmetry. We show that a chromomagnetic type of operator may play an important role in accounting for the deviation of the mixing CP asymmetry between $\overrightarrow{B}\phi K_S$ and $\overrightarrow{B}J/\psi K_S$ processes observed by the Belle and BaBar experiments. A possible correlation between the direct and mixing CP asymmetry is also discussed. Finally, we apply our result in the minimal supergravity model and supersymmetric models with nonuniversal soft terms.