Weak interactions and quasi-stable particle energy loss
  We discuss the interplay between electromagnetic energy loss and weak interactions in the context of quasistable particle particle propagation through materials. As specific examples, we consider staus, where weak interactions may play a role, and taus, where they don't. 
M. H. Reno (University of Iowa), I. Sarcevic and J. Uscinski   (University of Arizona)