We explore how the polarization of the tau leptons in the cascade decay $tilde{q}to qtildechi^0_2to qtautildetauto qtautautildechi^0_1$ can be exploited to study mixing properties of neutralinos and staus. We present details of the analysis including experimental effects such as transverse momentum cuts for the $tautopi u$ decay mode, and show that the di-pion invariant mass distribution provides valuable information on their properties.
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