Long Lived Charged Massive Particles and Big Bang Nucleosynthesis
  We consider Big Bang Nucleosynthesis(BBN) with long lived charged massive particles. Before decaying, the long lived massive particles recombines with a light element to form a bound state like a hydrogen atom. We discuss the possible change of primordial light element abundances due to formations of such bound states. 
Kazunori Kohri, Fumihiro Takayama