CP Violation in $\tau$ Decays at SuperB \& Super-Belle Experiments -- like Finding Signs of Dark Matter

BaBar has found $A_{\rm CP}(\tau^- \to \nu K_S\pi^- [\geq \pi^0]) = (-0.36 \pm 0.23 \pm 0.11)%$with2.8$\sigma$differencewithSMprediction$A_{\rm CP}(\tau^- \to \nu K_S\pi^-) = (0.36 \pm 0.01)%$basedon$K^0 - \bar K^0$ oscillation. Four central points: (i) to establish both the existence' of New Dynamics (ND) and its features’ in local CP asymmetries; (ii) to increase the number of final states to be probed; (iii) to emphasize correlations of CP violations between different final states; (iv) likewise for the correlations with $D^{\pm }$ final states. These measurements should be possible at SuperB & Belle II experiments.