Big-bang nucleosynthesis with a long-lived charged massive particle   including $^4$He spallation processes
  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. 
Toshifumi Jittoh, Kazunori Kohri, Masafumi Koike, Joe Sato, Kenichi   Sugai, Masato Yamanaka, Koichi Yazaki
hep-ph astro-ph.CO nucl-th