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Babar collaboration has reported an intriguing opposite sign in theintegrated decay rate asymmetry $A_{cp}(\tau \rightarrow K_{s} \pi \nu_{\tau})$than that of SM prediction from the known $K^{0}$ - $\bar{K^{0}}$ mixing.Babar's result deviate from the SM prediction by about 2.7$\sigma$. If theresult stands with higher precision in the future experiments, the observedsign anomaly in the $A_{cp}(\tau \rightarrow K_{s} \pi \nu_{\tau})$ can mostlikely come only from a NP. In this work we present a full angular spectrumanalysis on the contribution to $A_{cp}(\tau \rightarrow K_{s} \pi \nu_{\tau})$coming from the tensorial term. Assuming the real part of the NP tensorialcoupling 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, wehave been able to fit the result within 1$\sigma$ of the experimental values.

Full angular spectrum analysis of tensor current contribution to $A_{cp}(\tau \rightarrow K_{s} \pi \nu_{\tau})$