Metastable Staus: Reconstructing Non-Prompt Tracks at the ILC with the   SiD Detector
  We have explored the reconstruction of kinks from the decay of metastable staus into a gravitino and a stau lepton in the radial region between the outer layer of the vertex detector and the second central tracking layer. After applying a cut on track multiplicity, we find a high efficiency for such events, with minimal background from Standard Model processes. 
Christopher Betancourt, F. Alexander Bogert and Bruce A. Schumm
physics.ins-det