Big-bang nucleosynthesis with a long-lived CHAMP including He4   spallation process
  We propose helium-4 spallation processes induced by long-lived stau in supersymmetric standard models, and investigate an impact of the processes on light elements abundances. We show that, as long as the phase space of helium-4 spallation processes is open, they are more important than stau-catalyzed fusion and hence constrain the stau property. This talk is based on works (Jittoh et al., 2011). 
Toshifumi Jittoh, Kazunori Kohri, Masafumi Koike, Joe Sato, Kenichi   Sugai, Masato Yamanaka, and Koichi Yazaki
hep-ph