$\tau$ Polarization in SUSY Cascade Decays
  $\tau$ leptons emitted in cascade decays of supersymmetric particles are polarized. The polarization may be exploited to determine spin and mixing properties of the neutralinos and stau particles involved. 
S.Y. Choi, K. Hagiwara, Y.G. Kim, K. Mawatari, P.M. Zerwas