Full angular spectrum analysis of tensor current contribution to $A_{cp}(\tau \to K_s\pi {\nu }_{\tau })$

Babar collaboration has reported an intriguing opposite sign in the integrated decay rate asymmetry $A_{cp}(\tau \to K_s\pi {\nu }_{\tau })$ than that of SM prediction from the known $K^0$ - $\overline{K^0}$ mixing. Babar’s result deviate from the SM prediction by about 2.7$\sigma$. If the result stands with higher precision in the future experiments, the observed sign anomaly in the $A_{cp}(\tau \to K_s\pi {\nu }_{\tau })$ can most likely come only from a NP. In this work we present a full angular spectrum analysis on the contribution to $A_{cp}(\tau \to K_s\pi {\nu }_{\tau })$ coming from the tensorial term. Assuming the real part of the NP tensorial coupling is negligible compare to its imaginary part and with $A_{cp}(\tau \rightarrow K_{s} \pi \nu_{\tau})$and$Br(\tau \rightarrow K_{s} \pi \nu_{\tau})$ as data points to fit the imaginary part of the NP coupling, we have been able to fit the result within 1$\sigma$ of the experimental values.