1204.5817 (I. I. Bigi)

Probing CP Violation in $τ^- \to ν(Kπ/K2π/ 3K/ K3π)^- $
Decays    [PDF]

I. I. Bigi

It had been suggested to probe CP violation in $\tau \to \nu K\pi $ decays with $K^0 - \bar K^0$ oscillation to produce $A_{\rm CP}(\tau^- \to \nu K_S\pi^-) = (0.36 \pm 0.01)%$. BaBar has found $A_{\rm CP}(\tau^- \to \nu K_S\pi^- [\geq \pi^0]) = (-0.36 \pm 0.23 \pm 0.11)%$ -- i.e., 2.8 sigma difference with `SM' prediction. It is discussed, why one needs to probe $A_{\rm CP}(\tau \to \nu K\pi)$, $A_{\rm CP}(\tau \to \nu K2\pi)$ and $A_{\rm CP}(\tau \to \nu K3\pi)$ {\em separately} to establish the existence of New Dynamics and its (or their) features. It should be possible at Super-BaBar & Super-Belle experiments.

View original: http://arxiv.org/abs/1204.5817