Measurement of of the Time-Dependent CP asymmetries in $B^0 \to K_S K_S K_S$

We present a measurement of the time-dependent CP asymmetry in the channel $B^0 \to K_S K_S K_S$ using the full $\Upsilon(4S)$ dataset of the {\it B{\footnotesize A}B{\footnotesize AR}} experiment corresponding to 465 million $B\bar{B}$ pair events. This mode is of particular interest, as it is a theoretically clean penguin mode and potentially sensitive to new physics effects. We use an extended likelihood fit to determine the S and C parameters of the CP asymmetry simultaneously in the modes $B^0 \to K_S(\pi^+\pi^-) K_S(\pi^+\pi^-)K_S(\pi^+\pi^-) $ and $B^0 \to K_S(\pi^+\pi^-)K_S(\pi^+\pi^-)K_S(\pi^0\pi^0)$.